Feature/v2/sign (#4485)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: James Brunton <james@stirlingpdf.com>

frontend/package-lock.json

@@ -12,7 +12,9 @@
         "@atlaskit/pragmatic-drag-and-drop": "^1.7.7",
         "@embedpdf/core": "^1.3.0",
         "@embedpdf/engines": "^1.2.1",
+        "@embedpdf/plugin-annotation": "^1.3.0",
         "@embedpdf/plugin-export": "^1.3.0",
+        "@embedpdf/plugin-history": "^1.3.0",
         "@embedpdf/plugin-interaction-manager": "^1.3.0",
         "@embedpdf/plugin-loader": "^1.3.0",
         "@embedpdf/plugin-pan": "^1.3.0",
@@ -532,6 +534,26 @@
       "integrity": "sha512-rSBFYjxwQ58L/HcqR0l5Vv4G5t+CCOKlFYrDReTZYNN7fhzKPUWbXUn4ARahZWCNmF8svHumV2P4ArakJJviuw==",
       "license": "MIT"
     },
+    "node_modules/@embedpdf/plugin-annotation": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/@embedpdf/plugin-annotation/-/plugin-annotation-1.3.0.tgz",
+      "integrity": "sha512-W9N8kQebnOT5ci7pp4RRPXK2ZAMvQbdd4Qkt4vXAsL9QIKqprAMrvo0GKzUAqMaYUk9WhVHgc5zwpeSP3PVUHg==",
+      "license": "MIT",
+      "dependencies": {
+        "@embedpdf/models": "1.3.0",
+        "@embedpdf/utils": "1.3.0"
+      },
+      "peerDependencies": {
+        "@embedpdf/core": "1.3.0",
+        "@embedpdf/plugin-history": "1.3.0",
+        "@embedpdf/plugin-interaction-manager": "1.3.0",
+        "@embedpdf/plugin-selection": "1.3.0",
+        "preact": "^10.26.4",
+        "react": ">=16.8.0",
+        "react-dom": ">=16.8.0",
+        "vue": ">=3.2.0"
+      }
+    },
     "node_modules/@embedpdf/plugin-export": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/@embedpdf/plugin-export/-/plugin-export-1.3.0.tgz",
@@ -548,6 +570,22 @@
         "vue": ">=3.2.0"
       }
     },
+    "node_modules/@embedpdf/plugin-history": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/@embedpdf/plugin-history/-/plugin-history-1.3.0.tgz",
+      "integrity": "sha512-HiNig94e6jE4h3BTL8Yi1fLLtYPY50N7vrkHSImqDmUTIcNHbQVbBYVCPpFJxN5NtuuaQqN9p1Mr7DwOKX8lkw==",
+      "license": "MIT",
+      "dependencies": {
+        "@embedpdf/models": "1.3.0"
+      },
+      "peerDependencies": {
+        "@embedpdf/core": "1.3.0",
+        "preact": "^10.26.4",
+        "react": ">=16.8.0",
+        "react-dom": ">=16.8.0",
+        "vue": ">=3.2.0"
+      }
+    },
     "node_modules/@embedpdf/plugin-interaction-manager": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/@embedpdf/plugin-interaction-manager/-/plugin-interaction-manager-1.3.0.tgz",
@@ -770,6 +808,18 @@
         "vue": ">=3.2.0"
       }
     },
+    "node_modules/@embedpdf/utils": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/@embedpdf/utils/-/utils-1.3.0.tgz",
+      "integrity": "sha512-KEgdR85vd2CNKoSBoE5h4+e1n7MqEuIq3jZwD9MXAVKpHMaAIuD+S1khD8m4XLnbQXn32A9cO6Z6fmH0ndZ7+A==",
+      "license": "MIT",
+      "peerDependencies": {
+        "preact": "^10.26.4",
+        "react": ">=16.8.0",
+        "react-dom": ">=16.8.0",
+        "vue": ">=3.2.0"
+      }
+    },
     "node_modules/@emotion/babel-plugin": {
       "version": "11.13.5",
       "resolved": "https://registry.npmjs.org/@emotion/babel-plugin/-/babel-plugin-11.13.5.tgz",

frontend/package.json

@@ -8,7 +8,9 @@
     "@atlaskit/pragmatic-drag-and-drop": "^1.7.7",
     "@embedpdf/core": "^1.3.0",
     "@embedpdf/engines": "^1.2.1",
+    "@embedpdf/plugin-annotation": "^1.3.0",
     "@embedpdf/plugin-export": "^1.3.0",
+    "@embedpdf/plugin-history": "^1.3.0",
     "@embedpdf/plugin-interaction-manager": "^1.3.0",
     "@embedpdf/plugin-loader": "^1.3.0",
     "@embedpdf/plugin-pan": "^1.3.0",

frontend/public/locales/en-GB/translation.json

@@ -1732,6 +1732,7 @@
     "add": "Add",
     "saved": "Saved Signatures",
     "save": "Save Signature",
+    "applySignatures": "Apply Signatures",
     "personalSigs": "Personal Signatures",
     "sharedSigs": "Shared Signatures",
     "noSavedSigs": "No saved signatures found",
@@ -1743,7 +1744,42 @@
     "previous": "Previous page",
     "maintainRatio": "Toggle maintain aspect ratio",
     "undo": "Undo",
-    "redo": "Redo"
+    "redo": "Redo",
+    "submit": "Sign Document",
+    "steps": {
+      "configure": "Configure Signature"
+    },
+    "type": {
+      "title": "Signature Type",
+      "draw": "Draw",
+      "canvas": "Canvas",
+      "image": "Image",
+      "text": "Text"
+    },
+    "draw": {
+      "title": "Draw your signature",
+      "clear": "Clear"
+    },
+    "image": {
+      "label": "Upload signature image",
+      "placeholder": "Select image file",
+      "hint": "Upload a PNG or JPG image of your signature"
+    },
+    "text": {
+      "name": "Signer Name",
+      "placeholder": "Enter your full name"
+    },
+    "instructions": {
+      "title": "How to add signature"
+    },
+    "activate": "Activate Signature Placement",
+    "deactivate": "Stop Placing Signatures",
+    "results": {
+      "title": "Signature Results"
+    },
+    "error": {
+      "failed": "An error occurred while signing the PDF."
+    }
   },
   "flatten": {
     "title": "Flatten",
@@ -3385,6 +3421,16 @@
       "processImagesDesc": "Converts multiple image files into a single PDF document, then applies OCR technology to extract searchable text from the images."
     }
   },
+  "viewer": {
+    "firstPage": "First Page",
+    "lastPage": "Last Page",
+    "previousPage": "Previous Page",
+    "nextPage": "Next Page",
+    "zoomIn": "Zoom In",
+    "zoomOut": "Zoom Out",
+    "singlePageView": "Single Page View",
+    "dualPageView": "Dual Page View"
+  },
   "common": {
     "copy": "Copy",
     "copied": "Copied!",

frontend/scripts/generate-licenses.js

@@ -1,17 +1,15 @@
 #!/usr/bin/env node
 
-import { execSync } from 'node:child_process';
+const { execSync } = require('node:child_process');
-import { existsSync, mkdirSync, writeFileSync, readFileSync } from 'node:fs';
+const { existsSync, mkdirSync, writeFileSync, readFileSync } = require('node:fs');
-import * as path from 'node:path';
+const path = require('node:path');
-import { fileURLToPath } from 'node:url';
 
-import { argv } from 'node:process';
+const { argv } = require('node:process');
 const inputIdx = argv.indexOf('--input');
 const INPUT_FILE = inputIdx > -1 ? argv[inputIdx + 1] : null;
 const POSTPROCESS_ONLY = !!INPUT_FILE;
 
-const __filename = fileURLToPath(import.meta.url);
+// __dirname is available in CommonJS by default
-const __dirname = path.dirname(__filename);
 
 /**
  * Generate 3rd party licenses for frontend dependencies

frontend/src/App.tsx

@@ -14,6 +14,7 @@ import "./styles/cookieconsent.css";
 import "./index.css";
 import { RightRailProvider } from "./contexts/RightRailContext";
 import { ViewerProvider } from "./contexts/ViewerContext";
+import { SignatureProvider } from "./contexts/SignatureContext";
 
 // Import file ID debugging helpers (development only)
 import "./utils/fileIdSafety";
@@ -45,9 +46,11 @@ export default function App() {
                 <ToolWorkflowProvider>
                   <SidebarProvider>
                     <ViewerProvider>
+                      <SignatureProvider>
                       <RightRailProvider>
-                        <HomePage />
+                            <HomePage />
-                      </RightRailProvider>
+                          </RightRailProvider>
+                      </SignatureProvider>
                     </ViewerProvider>
                   </SidebarProvider>
                 </ToolWorkflowProvider>

frontend/src/assets/3rdPartyLicenses.json

@@ -7,6 +7,132 @@
             "moduleLicense": "Apache-2.0",
             "moduleLicenseUrl": "git+https://github.com/atlassian/pragmatic-drag-and-drop.git"
         },
+        {
+            "moduleName": "@embedpdf/core",
+            "moduleUrl": "https://registry.npmjs.org/@embedpdf/core/-/core-1.3.1.tgz",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "https://registry.npmjs.org/@embedpdf/core/-/core-1.3.1.tgz"
+        },
+        {
+            "moduleName": "@embedpdf/engines",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-annotation",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-export",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-history",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-interaction-manager",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-loader",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-pan",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-render",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-rotate",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-scroll",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-search",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-selection",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-spread",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-thumbnail",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-tiling",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-viewport",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
+        {
+            "moduleName": "@embedpdf/plugin-zoom",
+            "moduleUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git",
+            "moduleVersion": "1.3.0",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/embedpdf/embed-pdf-viewer.git"
+        },
         {
             "moduleName": "@emotion/react",
             "moduleUrl": "git+https://github.com/emotion-js/emotion.git#main",
@@ -35,6 +161,13 @@
             "moduleLicense": "MIT",
             "moduleLicenseUrl": "git+https://github.com/mantinedev/mantine.git"
         },
+        {
+            "moduleName": "@mantine/dates",
+            "moduleUrl": "git+https://github.com/mantinedev/mantine.git",
+            "moduleVersion": "8.3.1",
+            "moduleLicense": "MIT",
+            "moduleLicenseUrl": "git+https://github.com/mantinedev/mantine.git"
+        },
         {
             "moduleName": "@mantine/dropzone",
             "moduleUrl": "git+https://github.com/mantinedev/mantine.git",
@@ -143,7 +276,7 @@
         {
             "moduleName": "posthog-js",
             "moduleUrl": "git+https://github.com/PostHog/posthog-js.git",
-            "moduleVersion": "1.266.0",
+            "moduleVersion": "1.268.0",
             "moduleLicense": "SEE LICENSE IN LICENSE https://github.com/PostHog/posthog-js/blob/main/LICENSE",
             "moduleLicenseUrl": "git+https://github.com/PostHog/posthog-js.git"
         },

frontend/src/components/annotation/providers/PDFAnnotationProvider.tsx

@@ -0,0 +1,91 @@
+import React, { createContext, useContext, ReactNode } from 'react';
+
+interface PDFAnnotationContextValue {
+  // Drawing mode management
+  activateDrawMode: () => void;
+  deactivateDrawMode: () => void;
+  activateSignaturePlacementMode: () => void;
+  activateDeleteMode: () => void;
+
+  // Drawing settings
+  updateDrawSettings: (color: string, size: number) => void;
+
+  // History operations
+  undo: () => void;
+  redo: () => void;
+
+  // Image data management
+  storeImageData: (id: string, data: string) => void;
+  getImageData: (id: string) => string | undefined;
+
+  // Placement state
+  isPlacementMode: boolean;
+
+  // Signature configuration
+  signatureConfig: any | null;
+  setSignatureConfig: (config: any | null) => void;
+}
+
+const PDFAnnotationContext = createContext<PDFAnnotationContextValue | undefined>(undefined);
+
+interface PDFAnnotationProviderProps {
+  children: ReactNode;
+  // These would come from the signature context
+  activateDrawMode: () => void;
+  deactivateDrawMode: () => void;
+  activateSignaturePlacementMode: () => void;
+  activateDeleteMode: () => void;
+  updateDrawSettings: (color: string, size: number) => void;
+  undo: () => void;
+  redo: () => void;
+  storeImageData: (id: string, data: string) => void;
+  getImageData: (id: string) => string | undefined;
+  isPlacementMode: boolean;
+  signatureConfig: any | null;
+  setSignatureConfig: (config: any | null) => void;
+}
+
+export const PDFAnnotationProvider: React.FC<PDFAnnotationProviderProps> = ({
+  children,
+  activateDrawMode,
+  deactivateDrawMode,
+  activateSignaturePlacementMode,
+  activateDeleteMode,
+  updateDrawSettings,
+  undo,
+  redo,
+  storeImageData,
+  getImageData,
+  isPlacementMode,
+  signatureConfig,
+  setSignatureConfig
+}) => {
+  const contextValue: PDFAnnotationContextValue = {
+    activateDrawMode,
+    deactivateDrawMode,
+    activateSignaturePlacementMode,
+    activateDeleteMode,
+    updateDrawSettings,
+    undo,
+    redo,
+    storeImageData,
+    getImageData,
+    isPlacementMode,
+    signatureConfig,
+    setSignatureConfig
+  };
+
+  return (
+    <PDFAnnotationContext.Provider value={contextValue}>
+      {children}
+    </PDFAnnotationContext.Provider>
+  );
+};
+
+export const usePDFAnnotation = (): PDFAnnotationContextValue => {
+  const context = useContext(PDFAnnotationContext);
+  if (context === undefined) {
+    throw new Error('usePDFAnnotation must be used within a PDFAnnotationProvider');
+  }
+  return context;
+};

frontend/src/components/annotation/shared/BaseAnnotationTool.tsx

@@ -0,0 +1,89 @@
+import React, { useState } from 'react';
+import { Stack, Alert, Text } from '@mantine/core';
+import { useTranslation } from 'react-i18next';
+import { DrawingControls } from './DrawingControls';
+import { ColorPicker } from './ColorPicker';
+import { usePDFAnnotation } from '../providers/PDFAnnotationProvider';
+
+export interface AnnotationToolConfig {
+  enableDrawing?: boolean;
+  enableImageUpload?: boolean;
+  enableTextInput?: boolean;
+  showPlaceButton?: boolean;
+  placeButtonText?: string;
+}
+
+interface BaseAnnotationToolProps {
+  config: AnnotationToolConfig;
+  children: React.ReactNode;
+  onSignatureDataChange?: (data: string | null) => void;
+  disabled?: boolean;
+}
+
+export const BaseAnnotationTool: React.FC<BaseAnnotationToolProps> = ({
+  config,
+  children,
+  onSignatureDataChange,
+  disabled = false
+}) => {
+  const { t } = useTranslation();
+  const {
+    activateSignaturePlacementMode,
+    undo,
+    redo
+  } = usePDFAnnotation();
+
+  const [selectedColor, setSelectedColor] = useState('#000000');
+  const [isColorPickerOpen, setIsColorPickerOpen] = useState(false);
+  const [signatureData, setSignatureData] = useState<string | null>(null);
+
+  const handleSignatureDataChange = (data: string | null) => {
+    setSignatureData(data);
+    onSignatureDataChange?.(data);
+  };
+
+  const handlePlaceSignature = () => {
+    if (activateSignaturePlacementMode) {
+      activateSignaturePlacementMode();
+    }
+  };
+
+  return (
+    <Stack gap="md">
+      {/* Drawing Controls (Undo/Redo/Place) */}
+      <DrawingControls
+        onUndo={undo}
+        onRedo={redo}
+        onPlaceSignature={config.showPlaceButton ? handlePlaceSignature : undefined}
+        hasSignatureData={!!signatureData}
+        disabled={disabled}
+        showPlaceButton={config.showPlaceButton}
+        placeButtonText={config.placeButtonText}
+      />
+
+      {/* Tool Content */}
+      {React.cloneElement(children as React.ReactElement<any>, {
+        selectedColor,
+        signatureData,
+        onSignatureDataChange: handleSignatureDataChange,
+        onColorSwatchClick: () => setIsColorPickerOpen(true),
+        disabled
+      })}
+
+      {/* Instructions for placing signature */}
+      <Alert color="blue" title={t('sign.instructions.title', 'How to add signature')}>
+        <Text size="sm">
+          Click anywhere on the PDF to place your annotation.
+        </Text>
+      </Alert>
+
+      {/* Color Picker Modal */}
+      <ColorPicker
+        isOpen={isColorPickerOpen}
+        onClose={() => setIsColorPickerOpen(false)}
+        selectedColor={selectedColor}
+        onColorChange={setSelectedColor}
+      />
+    </Stack>
+  );
+};

frontend/src/components/annotation/shared/ColorPicker.tsx

@@ -0,0 +1,67 @@
+import React from 'react';
+import { Modal, Stack, ColorPicker as MantineColorPicker, Group, Button, ColorSwatch } from '@mantine/core';
+
+interface ColorPickerProps {
+  isOpen: boolean;
+  onClose: () => void;
+  selectedColor: string;
+  onColorChange: (color: string) => void;
+  title?: string;
+}
+
+export const ColorPicker: React.FC<ColorPickerProps> = ({
+  isOpen,
+  onClose,
+  selectedColor,
+  onColorChange,
+  title = "Choose Color"
+}) => {
+  return (
+    <Modal
+      opened={isOpen}
+      onClose={onClose}
+      title={title}
+      size="sm"
+      centered
+    >
+      <Stack gap="md">
+        <MantineColorPicker
+          format="hex"
+          value={selectedColor}
+          onChange={onColorChange}
+          swatches={['#000000', '#0066cc', '#cc0000', '#cc6600', '#009900', '#6600cc']}
+          swatchesPerRow={6}
+          size="lg"
+          fullWidth
+        />
+        <Group justify="flex-end">
+          <Button onClick={onClose}>
+            Done
+          </Button>
+        </Group>
+      </Stack>
+    </Modal>
+  );
+};
+
+interface ColorSwatchButtonProps {
+  color: string;
+  onClick: () => void;
+  size?: number;
+}
+
+export const ColorSwatchButton: React.FC<ColorSwatchButtonProps> = ({
+  color,
+  onClick,
+  size = 24
+}) => {
+  return (
+    <ColorSwatch
+      color={color}
+      size={size}
+      radius={0}
+      style={{ cursor: 'pointer' }}
+      onClick={onClick}
+    />
+  );
+};

frontend/src/components/annotation/shared/DrawingCanvas.tsx

@@ -0,0 +1,437 @@
+import React, { useRef, useState, useCallback } from 'react';
+import { Paper, Group, Button, Modal, Stack, Text } from '@mantine/core';
+import { ColorSwatchButton } from './ColorPicker';
+import PenSizeSelector from '../../tools/sign/PenSizeSelector';
+
+interface DrawingCanvasProps {
+  selectedColor: string;
+  penSize: number;
+  penSizeInput: string;
+  onColorSwatchClick: () => void;
+  onPenSizeChange: (size: number) => void;
+  onPenSizeInputChange: (input: string) => void;
+  onSignatureDataChange: (data: string | null) => void;
+  disabled?: boolean;
+  width?: number;
+  height?: number;
+  modalWidth?: number;
+  modalHeight?: number;
+  additionalButtons?: React.ReactNode;
+}
+
+export const DrawingCanvas: React.FC<DrawingCanvasProps> = ({
+  selectedColor,
+  penSize,
+  penSizeInput,
+  onColorSwatchClick,
+  onPenSizeChange,
+  onPenSizeInputChange,
+  onSignatureDataChange,
+  disabled = false,
+  width = 400,
+  height = 150,
+  modalWidth = 800,
+  modalHeight = 400,
+  additionalButtons
+}) => {
+  const canvasRef = useRef<HTMLCanvasElement>(null);
+  const modalCanvasRef = useRef<HTMLCanvasElement>(null);
+  const visibleModalCanvasRef = useRef<HTMLCanvasElement>(null);
+
+  const [isDrawing, setIsDrawing] = useState(false);
+  const [isModalDrawing, setIsModalDrawing] = useState(false);
+  const [isModalOpen, setIsModalOpen] = useState(false);
+
+  // Drawing functions for main canvas
+  const startDrawing = useCallback((e: React.MouseEvent<HTMLCanvasElement>) => {
+    if (!canvasRef.current || disabled) return;
+
+    setIsDrawing(true);
+    const rect = canvasRef.current.getBoundingClientRect();
+    const scaleX = canvasRef.current.width / rect.width;
+    const scaleY = canvasRef.current.height / rect.height;
+    const x = (e.clientX - rect.left) * scaleX;
+    const y = (e.clientY - rect.top) * scaleY;
+
+    const ctx = canvasRef.current.getContext('2d');
+    if (ctx) {
+      ctx.strokeStyle = selectedColor;
+      ctx.lineWidth = penSize;
+      ctx.lineCap = 'round';
+      ctx.lineJoin = 'round';
+      ctx.beginPath();
+      ctx.moveTo(x, y);
+    }
+  }, [disabled, selectedColor, penSize]);
+
+  const draw = useCallback((e: React.MouseEvent<HTMLCanvasElement>) => {
+    if (!isDrawing || !canvasRef.current || disabled) return;
+
+    const rect = canvasRef.current.getBoundingClientRect();
+    const scaleX = canvasRef.current.width / rect.width;
+    const scaleY = canvasRef.current.height / rect.height;
+    const x = (e.clientX - rect.left) * scaleX;
+    const y = (e.clientY - rect.top) * scaleY;
+
+    const ctx = canvasRef.current.getContext('2d');
+    if (ctx) {
+      ctx.lineTo(x, y);
+      ctx.stroke();
+    }
+  }, [isDrawing, disabled]);
+
+  const stopDrawing = useCallback(() => {
+    if (!isDrawing || disabled) return;
+
+    setIsDrawing(false);
+
+    // Save canvas as signature data
+    if (canvasRef.current) {
+      const dataURL = canvasRef.current.toDataURL('image/png');
+      onSignatureDataChange(dataURL);
+    }
+  }, [isDrawing, disabled, onSignatureDataChange]);
+
+  // Modal canvas drawing functions
+  const startModalDrawing = useCallback((e: React.MouseEvent<HTMLCanvasElement>) => {
+    if (!visibleModalCanvasRef.current || !modalCanvasRef.current) return;
+
+    setIsModalDrawing(true);
+    const rect = visibleModalCanvasRef.current.getBoundingClientRect();
+    const scaleX = visibleModalCanvasRef.current.width / rect.width;
+    const scaleY = visibleModalCanvasRef.current.height / rect.height;
+    const x = (e.clientX - rect.left) * scaleX;
+    const y = (e.clientY - rect.top) * scaleY;
+
+    // Draw on both the visible modal canvas and hidden canvas
+    const visibleCtx = visibleModalCanvasRef.current.getContext('2d');
+    const hiddenCtx = modalCanvasRef.current.getContext('2d');
+
+    [visibleCtx, hiddenCtx].forEach(ctx => {
+      if (ctx) {
+        ctx.strokeStyle = selectedColor;
+        ctx.lineWidth = penSize;
+        ctx.lineCap = 'round';
+        ctx.lineJoin = 'round';
+        ctx.beginPath();
+        ctx.moveTo(x, y);
+      }
+    });
+  }, [selectedColor, penSize]);
+
+  const drawModal = useCallback((e: React.MouseEvent<HTMLCanvasElement>) => {
+    if (!isModalDrawing || !visibleModalCanvasRef.current || !modalCanvasRef.current) return;
+
+    const rect = visibleModalCanvasRef.current.getBoundingClientRect();
+    const scaleX = visibleModalCanvasRef.current.width / rect.width;
+    const scaleY = visibleModalCanvasRef.current.height / rect.height;
+    const x = (e.clientX - rect.left) * scaleX;
+    const y = (e.clientY - rect.top) * scaleY;
+
+    // Draw on both canvases
+    const visibleCtx = visibleModalCanvasRef.current.getContext('2d');
+    const hiddenCtx = modalCanvasRef.current.getContext('2d');
+
+    [visibleCtx, hiddenCtx].forEach(ctx => {
+      if (ctx) {
+        ctx.lineTo(x, y);
+        ctx.stroke();
+      }
+    });
+  }, [isModalDrawing]);
+
+  const stopModalDrawing = useCallback(() => {
+    if (!isModalDrawing) return;
+    setIsModalDrawing(false);
+
+    // Sync the canvases and update signature data (only when drawing stops)
+    if (modalCanvasRef.current) {
+      const dataURL = modalCanvasRef.current.toDataURL('image/png');
+      onSignatureDataChange(dataURL);
+
+      // Also update the small canvas display
+      if (canvasRef.current) {
+        const smallCtx = canvasRef.current.getContext('2d');
+        if (smallCtx) {
+          const img = new Image();
+          img.onload = () => {
+            smallCtx.clearRect(0, 0, canvasRef.current!.width, canvasRef.current!.height);
+            smallCtx.drawImage(img, 0, 0, canvasRef.current!.width, canvasRef.current!.height);
+          };
+          img.src = dataURL;
+        }
+      }
+    }
+  }, [isModalDrawing]);
+
+  // Clear canvas functions
+  const clearCanvas = useCallback(() => {
+    if (!canvasRef.current || disabled) return;
+
+    const ctx = canvasRef.current.getContext('2d');
+    if (ctx) {
+      ctx.clearRect(0, 0, canvasRef.current.width, canvasRef.current.height);
+
+      // Also clear the modal canvas if it exists
+      if (modalCanvasRef.current) {
+        const modalCtx = modalCanvasRef.current.getContext('2d');
+        if (modalCtx) {
+          modalCtx.clearRect(0, 0, modalCanvasRef.current.width, modalCanvasRef.current.height);
+        }
+      }
+
+      onSignatureDataChange(null);
+    }
+  }, [disabled]);
+
+  const clearModalCanvas = useCallback(() => {
+    // Clear both modal canvases (visible and hidden)
+    if (modalCanvasRef.current) {
+      const hiddenCtx = modalCanvasRef.current.getContext('2d');
+      if (hiddenCtx) {
+        hiddenCtx.clearRect(0, 0, modalCanvasRef.current.width, modalCanvasRef.current.height);
+      }
+    }
+
+    if (visibleModalCanvasRef.current) {
+      const visibleCtx = visibleModalCanvasRef.current.getContext('2d');
+      if (visibleCtx) {
+        visibleCtx.clearRect(0, 0, visibleModalCanvasRef.current.width, visibleModalCanvasRef.current.height);
+      }
+    }
+
+    // Also clear the main canvas and signature data
+    if (canvasRef.current) {
+      const mainCtx = canvasRef.current.getContext('2d');
+      if (mainCtx) {
+        mainCtx.clearRect(0, 0, canvasRef.current.width, canvasRef.current.height);
+      }
+    }
+
+    onSignatureDataChange(null);
+  }, []);
+
+  const saveModalSignature = useCallback(() => {
+    if (!modalCanvasRef.current) return;
+
+    const dataURL = modalCanvasRef.current.toDataURL('image/png');
+    onSignatureDataChange(dataURL);
+
+    // Copy to small canvas for display
+    if (canvasRef.current) {
+      const ctx = canvasRef.current.getContext('2d');
+      if (ctx) {
+        const img = new Image();
+        img.onload = () => {
+          ctx.clearRect(0, 0, canvasRef.current!.width, canvasRef.current!.height);
+          ctx.drawImage(img, 0, 0, canvasRef.current!.width, canvasRef.current!.height);
+        };
+        img.src = dataURL;
+      }
+    }
+
+    setIsModalOpen(false);
+  }, []);
+
+  const openModal = useCallback(() => {
+    setIsModalOpen(true);
+    // Copy content to modal canvas after a brief delay
+    setTimeout(() => {
+      if (visibleModalCanvasRef.current && modalCanvasRef.current) {
+        const visibleCtx = visibleModalCanvasRef.current.getContext('2d');
+        if (visibleCtx) {
+          visibleCtx.strokeStyle = selectedColor;
+          visibleCtx.lineWidth = penSize;
+          visibleCtx.lineCap = 'round';
+          visibleCtx.lineJoin = 'round';
+          visibleCtx.clearRect(0, 0, visibleModalCanvasRef.current.width, visibleModalCanvasRef.current.height);
+          visibleCtx.drawImage(modalCanvasRef.current, 0, 0, visibleModalCanvasRef.current.width, visibleModalCanvasRef.current.height);
+        }
+      }
+    }, 300);
+  }, [selectedColor, penSize]);
+
+  // Initialize canvas settings whenever color or pen size changes
+  React.useEffect(() => {
+    const updateCanvas = (canvas: HTMLCanvasElement | null) => {
+      if (!canvas) return;
+      const ctx = canvas.getContext('2d');
+      if (ctx) {
+        ctx.strokeStyle = selectedColor;
+        ctx.lineWidth = penSize;
+        ctx.lineCap = 'round';
+        ctx.lineJoin = 'round';
+      }
+    };
+
+    updateCanvas(canvasRef.current);
+    updateCanvas(modalCanvasRef.current);
+    updateCanvas(visibleModalCanvasRef.current);
+  }, [selectedColor, penSize]);
+
+  return (
+    <>
+      <Paper withBorder p="md">
+        <Stack gap="sm">
+          <Group justify="space-between">
+            <Text fw={500}>Draw your signature</Text>
+            <Group gap="lg">
+              <div>
+                <Text size="sm" fw={500} mb="xs" ta="center">Color</Text>
+                <Group justify="center">
+                  <ColorSwatchButton
+                    color={selectedColor}
+                    onClick={onColorSwatchClick}
+                  />
+                </Group>
+              </div>
+              <div>
+                <Text size="sm" fw={500} mb="xs">Pen Size</Text>
+                <PenSizeSelector
+                  value={penSize}
+                  inputValue={penSizeInput}
+                  onValueChange={onPenSizeChange}
+                  onInputChange={onPenSizeInputChange}
+                  disabled={disabled}
+                  placeholder="Size"
+                  size="compact-sm"
+                  style={{ width: '60px' }}
+                />
+              </div>
+              <div style={{ paddingTop: '24px' }}>
+                <Button
+                  variant="light"
+                  size="compact-sm"
+                  onClick={openModal}
+                  disabled={disabled}
+                >
+                  Expand
+                </Button>
+              </div>
+            </Group>
+          </Group>
+          <canvas
+            ref={canvasRef}
+            width={width}
+            height={height}
+            style={{
+              border: '1px solid #ccc',
+              borderRadius: '4px',
+              cursor: disabled ? 'default' : 'crosshair',
+              backgroundColor: '#ffffff',
+              width: '100%',
+            }}
+            onMouseDown={startDrawing}
+            onMouseMove={draw}
+            onMouseUp={stopDrawing}
+            onMouseLeave={stopDrawing}
+          />
+          <Group justify="space-between">
+            <div>
+              {additionalButtons}
+            </div>
+            <Button
+              variant="subtle"
+              color="red"
+              size="compact-sm"
+              onClick={clearCanvas}
+              disabled={disabled}
+            >
+              Clear
+            </Button>
+          </Group>
+        </Stack>
+      </Paper>
+
+      {/* Hidden canvas for modal synchronization */}
+      <canvas
+        ref={modalCanvasRef}
+        width={modalWidth}
+        height={modalHeight}
+        style={{ display: 'none' }}
+      />
+
+      {/* Modal for larger signature canvas */}
+      <Modal
+        opened={isModalOpen}
+        onClose={() => setIsModalOpen(false)}
+        title="Draw Your Signature"
+        size="xl"
+        centered
+      >
+        <Stack gap="md">
+          {/* Color and Pen Size picker */}
+          <Paper withBorder p="sm">
+            <Group gap="lg" align="flex-end">
+              <div>
+                <Text size="sm" fw={500} mb="xs">Color</Text>
+                <ColorSwatchButton
+                  color={selectedColor}
+                  onClick={onColorSwatchClick}
+                />
+              </div>
+              <div>
+                <Text size="sm" fw={500} mb="xs">Pen Size</Text>
+                <PenSizeSelector
+                  value={penSize}
+                  inputValue={penSizeInput}
+                  onValueChange={onPenSizeChange}
+                  onInputChange={onPenSizeInputChange}
+                  placeholder="Size"
+                  size="compact-sm"
+                  style={{ width: '60px' }}
+                />
+              </div>
+            </Group>
+          </Paper>
+
+          <Paper withBorder p="md">
+            <canvas
+              ref={visibleModalCanvasRef}
+              width={modalWidth}
+              height={modalHeight}
+              style={{
+                border: '1px solid #ccc',
+                borderRadius: '4px',
+                cursor: 'crosshair',
+                backgroundColor: '#ffffff',
+                width: '100%',
+                maxWidth: `${modalWidth}px`,
+                height: 'auto',
+              }}
+              onMouseDown={startModalDrawing}
+              onMouseMove={drawModal}
+              onMouseUp={stopModalDrawing}
+              onMouseLeave={stopModalDrawing}
+            />
+          </Paper>
+
+          <Group justify="space-between">
+            <Button
+              variant="subtle"
+              color="red"
+              onClick={clearModalCanvas}
+            >
+              Clear Canvas
+            </Button>
+            <Group gap="sm">
+              <Button
+                variant="subtle"
+                onClick={() => setIsModalOpen(false)}
+              >
+                Cancel
+              </Button>
+              <Button
+                onClick={saveModalSignature}
+              >
+                Save Signature
+              </Button>
+            </Group>
+          </Group>
+        </Stack>
+      </Modal>
+    </>
+  );
+};
+
+export default DrawingCanvas;

frontend/src/components/annotation/shared/DrawingControls.tsx

@@ -0,0 +1,60 @@
+import React from 'react';
+import { Group, Button } from '@mantine/core';
+import { useTranslation } from 'react-i18next';
+
+interface DrawingControlsProps {
+  onUndo?: () => void;
+  onRedo?: () => void;
+  onPlaceSignature?: () => void;
+  hasSignatureData?: boolean;
+  disabled?: boolean;
+  showPlaceButton?: boolean;
+  placeButtonText?: string;
+}
+
+export const DrawingControls: React.FC<DrawingControlsProps> = ({
+  onUndo,
+  onRedo,
+  onPlaceSignature,
+  hasSignatureData = false,
+  disabled = false,
+  showPlaceButton = true,
+  placeButtonText = "Update and Place"
+}) => {
+  const { t } = useTranslation();
+
+  return (
+    <Group gap="sm">
+      {/* Undo/Redo Controls */}
+      <Button
+        variant="outline"
+        onClick={onUndo}
+        disabled={disabled}
+        flex={1}
+      >
+        {t('sign.undo', 'Undo')}
+      </Button>
+      <Button
+        variant="outline"
+        onClick={onRedo}
+        disabled={disabled}
+        flex={1}
+      >
+        {t('sign.redo', 'Redo')}
+      </Button>
+
+      {/* Place Signature Button */}
+      {showPlaceButton && onPlaceSignature && (
+        <Button
+          variant="filled"
+          color="blue"
+          onClick={onPlaceSignature}
+          disabled={disabled || !hasSignatureData}
+          flex={1}
+        >
+          {placeButtonText}
+        </Button>
+      )}
+    </Group>
+  );
+};

frontend/src/components/annotation/shared/ImageUploader.tsx

@@ -0,0 +1,55 @@
+import React from 'react';
+import { FileInput, Text, Stack } from '@mantine/core';
+import { useTranslation } from 'react-i18next';
+
+interface ImageUploaderProps {
+  onImageChange: (file: File | null) => void;
+  disabled?: boolean;
+  label?: string;
+  placeholder?: string;
+  hint?: string;
+}
+
+export const ImageUploader: React.FC<ImageUploaderProps> = ({
+  onImageChange,
+  disabled = false,
+  label,
+  placeholder,
+  hint
+}) => {
+  const { t } = useTranslation();
+
+  const handleImageChange = async (file: File | null) => {
+    if (file && !disabled) {
+      try {
+        // Validate that it's actually an image file
+        if (!file.type.startsWith('image/')) {
+          console.error('Selected file is not an image');
+          return;
+        }
+
+        onImageChange(file);
+      } catch (error) {
+        console.error('Error processing image file:', error);
+      }
+    } else if (!file) {
+      // Clear image data when no file is selected
+      onImageChange(null);
+    }
+  };
+
+  return (
+    <Stack gap="sm">
+      <FileInput
+        label={label || t('sign.image.label', 'Upload signature image')}
+        placeholder={placeholder || t('sign.image.placeholder', 'Select image file')}
+        accept="image/*"
+        onChange={handleImageChange}
+        disabled={disabled}
+      />
+      <Text size="sm" c="dimmed">
+        {hint || t('sign.image.hint', 'Upload a PNG or JPG image of your signature')}
+      </Text>
+    </Stack>
+  );
+};

frontend/src/components/annotation/shared/TextInputWithFont.tsx

@@ -0,0 +1,126 @@
+import React, { useState, useEffect } from 'react';
+import { Stack, TextInput, Select, Combobox, useCombobox } from '@mantine/core';
+import { useTranslation } from 'react-i18next';
+
+interface TextInputWithFontProps {
+  text: string;
+  onTextChange: (text: string) => void;
+  fontSize: number;
+  onFontSizeChange: (size: number) => void;
+  fontFamily: string;
+  onFontFamilyChange: (family: string) => void;
+  disabled?: boolean;
+  label?: string;
+  placeholder?: string;
+}
+
+export const TextInputWithFont: React.FC<TextInputWithFontProps> = ({
+  text,
+  onTextChange,
+  fontSize,
+  onFontSizeChange,
+  fontFamily,
+  onFontFamilyChange,
+  disabled = false,
+  label,
+  placeholder
+}) => {
+  const { t } = useTranslation();
+  const [fontSizeInput, setFontSizeInput] = useState(fontSize.toString());
+  const fontSizeCombobox = useCombobox();
+
+  // Sync font size input with prop changes
+  useEffect(() => {
+    setFontSizeInput(fontSize.toString());
+  }, [fontSize]);
+
+  const fontOptions = [
+    { value: 'Helvetica', label: 'Helvetica' },
+    { value: 'Times-Roman', label: 'Times' },
+    { value: 'Courier', label: 'Courier' },
+    { value: 'Arial', label: 'Arial' },
+    { value: 'Georgia', label: 'Georgia' },
+  ];
+
+  const fontSizeOptions = ['8', '12', '16', '20', '24', '28', '32', '36', '40', '48'];
+
+  return (
+    <Stack gap="sm">
+      <TextInput
+        label={label || t('sign.text.name', 'Signer Name')}
+        placeholder={placeholder || t('sign.text.placeholder', 'Enter your full name')}
+        value={text}
+        onChange={(e) => onTextChange(e.target.value)}
+        disabled={disabled}
+        required
+      />
+
+      {/* Font Selection */}
+      <Select
+        label="Font"
+        value={fontFamily}
+        onChange={(value) => onFontFamilyChange(value || 'Helvetica')}
+        data={fontOptions}
+        disabled={disabled}
+        searchable
+        allowDeselect={false}
+      />
+
+      {/* Font Size */}
+      <Combobox
+        onOptionSubmit={(optionValue) => {
+          setFontSizeInput(optionValue);
+          const size = parseInt(optionValue);
+          if (!isNaN(size)) {
+            onFontSizeChange(size);
+          }
+          fontSizeCombobox.closeDropdown();
+        }}
+        store={fontSizeCombobox}
+        withinPortal={false}
+      >
+        <Combobox.Target>
+          <TextInput
+            label="Font Size"
+            placeholder="Type or select font size (8-72)"
+            value={fontSizeInput}
+            onChange={(event) => {
+              const value = event.currentTarget.value;
+              setFontSizeInput(value);
+
+              // Parse and validate the typed value in real-time
+              const size = parseInt(value);
+              if (!isNaN(size) && size >= 8 && size <= 72) {
+                onFontSizeChange(size);
+              }
+
+              fontSizeCombobox.openDropdown();
+              fontSizeCombobox.updateSelectedOptionIndex();
+            }}
+            onClick={() => fontSizeCombobox.openDropdown()}
+            onFocus={() => fontSizeCombobox.openDropdown()}
+            onBlur={() => {
+              fontSizeCombobox.closeDropdown();
+              // Clean up invalid values on blur
+              const size = parseInt(fontSizeInput);
+              if (isNaN(size) || size < 8 || size > 72) {
+                setFontSizeInput(fontSize.toString());
+              }
+            }}
+            disabled={disabled}
+          />
+        </Combobox.Target>
+
+        <Combobox.Dropdown>
+          <Combobox.Options>
+            {fontSizeOptions.map((size) => (
+              <Combobox.Option value={size} key={size}>
+                {size}px
+              </Combobox.Option>
+            ))}
+          </Combobox.Options>
+        </Combobox.Dropdown>
+      </Combobox>
+    </Stack>
+  );
+};

frontend/src/components/annotation/tools/DrawingTool.tsx

@@ -0,0 +1,45 @@
+import React, { useState } from 'react';
+import { Stack } from '@mantine/core';
+import { BaseAnnotationTool } from '../shared/BaseAnnotationTool';
+import { DrawingCanvas } from '../shared/DrawingCanvas';
+
+interface DrawingToolProps {
+  onDrawingChange?: (data: string | null) => void;
+  disabled?: boolean;
+}
+
+export const DrawingTool: React.FC<DrawingToolProps> = ({
+  onDrawingChange,
+  disabled = false
+}) => {
+  const [selectedColor] = useState('#000000');
+  const [penSize, setPenSize] = useState(2);
+  const [penSizeInput, setPenSizeInput] = useState('2');
+
+  const toolConfig = {
+    enableDrawing: true,
+    showPlaceButton: true,
+    placeButtonText: "Place Drawing"
+  };
+
+  return (
+    <BaseAnnotationTool
+      config={toolConfig}
+      onSignatureDataChange={onDrawingChange}
+      disabled={disabled}
+    >
+      <Stack gap="sm">
+        <DrawingCanvas
+          selectedColor={selectedColor}
+          penSize={penSize}
+          penSizeInput={penSizeInput}
+          onColorSwatchClick={() => {}} // Color picker handled by BaseAnnotationTool
+          onPenSizeChange={setPenSize}
+          onPenSizeInputChange={setPenSizeInput}
+          onSignatureDataChange={onDrawingChange || (() => {})}
+          disabled={disabled}
+        />
+      </Stack>
+    </BaseAnnotationTool>
+  );
+};

frontend/src/components/annotation/tools/ImageTool.tsx

@@ -0,0 +1,67 @@
+import React, { useState } from 'react';
+import { Stack } from '@mantine/core';
+import { BaseAnnotationTool } from '../shared/BaseAnnotationTool';
+import { ImageUploader } from '../shared/ImageUploader';
+
+interface ImageToolProps {
+  onImageChange?: (data: string | null) => void;
+  disabled?: boolean;
+}
+
+export const ImageTool: React.FC<ImageToolProps> = ({
+  onImageChange,
+  disabled = false
+}) => {
+  const [, setImageData] = useState<string | null>(null);
+
+  const handleImageUpload = async (file: File | null) => {
+    if (file && !disabled) {
+      try {
+        const result = await new Promise<string>((resolve, reject) => {
+          const reader = new FileReader();
+          reader.onload = (e) => {
+            if (e.target?.result) {
+              resolve(e.target.result as string);
+            } else {
+              reject(new Error('Failed to read file'));
+            }
+          };
+          reader.onerror = () => reject(reader.error);
+          reader.readAsDataURL(file);
+        });
+
+        setImageData(result);
+        onImageChange?.(result);
+      } catch (error) {
+        console.error('Error reading file:', error);
+      }
+    } else if (!file) {
+      setImageData(null);
+      onImageChange?.(null);
+    }
+  };
+
+  const toolConfig = {
+    enableImageUpload: true,
+    showPlaceButton: true,
+    placeButtonText: "Place Image"
+  };
+
+  return (
+    <BaseAnnotationTool
+      config={toolConfig}
+      onSignatureDataChange={onImageChange}
+      disabled={disabled}
+    >
+      <Stack gap="sm">
+        <ImageUploader
+          onImageChange={handleImageUpload}
+          disabled={disabled}
+          label="Upload Image"
+          placeholder="Select image file"
+          hint="Upload a PNG, JPG, or other image file to place on the PDF"
+        />
+      </Stack>
+    </BaseAnnotationTool>
+  );
+};

frontend/src/components/annotation/tools/TextTool.tsx

@@ -0,0 +1,57 @@
+import React, { useState } from 'react';
+import { Stack } from '@mantine/core';
+import { BaseAnnotationTool } from '../shared/BaseAnnotationTool';
+import { TextInputWithFont } from '../shared/TextInputWithFont';
+
+interface TextToolProps {
+  onTextChange?: (text: string) => void;
+  disabled?: boolean;
+}
+
+export const TextTool: React.FC<TextToolProps> = ({
+  onTextChange,
+  disabled = false
+}) => {
+  const [text, setText] = useState('');
+  const [fontSize, setFontSize] = useState(16);
+  const [fontFamily, setFontFamily] = useState('Helvetica');
+
+  const handleTextChange = (newText: string) => {
+    setText(newText);
+    onTextChange?.(newText);
+  };
+
+  const handleSignatureDataChange = (data: string | null) => {
+    if (data) {
+      onTextChange?.(data);
+    }
+  };
+
+  const toolConfig = {
+    enableTextInput: true,
+    showPlaceButton: true,
+    placeButtonText: "Place Text"
+  };
+
+  return (
+    <BaseAnnotationTool
+      config={toolConfig}
+      onSignatureDataChange={handleSignatureDataChange}
+      disabled={disabled}
+    >
+      <Stack gap="sm">
+        <TextInputWithFont
+          text={text}
+          onTextChange={handleTextChange}
+          fontSize={fontSize}
+          onFontSizeChange={setFontSize}
+          fontFamily={fontFamily}
+          onFontFamilyChange={setFontFamily}
+          disabled={disabled}
+          label="Text Content"
+          placeholder="Enter text to place on the PDF"
+        />
+      </Stack>
+    </BaseAnnotationTool>
+  );
+};

frontend/src/components/shared/RightRail.tsx

@@ -14,6 +14,7 @@ import { Tooltip } from '../shared/Tooltip';
 import BulkSelectionPanel from '../pageEditor/BulkSelectionPanel';
 import { SearchInterface } from '../viewer/SearchInterface';
 import { ViewerContext } from '../../contexts/ViewerContext';
+import { useSignature } from '../../contexts/SignatureContext';
 
 import { parseSelection } from '../../utils/bulkselection/parseSelection';
 
@@ -43,6 +44,9 @@ export default function RightRail() {
   const { selectedFiles, selectedFileIds, setSelectedFiles } = useFileSelection();
   const { removeFiles } = useFileManagement();
 
+  // Signature context for checking if signatures have been applied
+  const { signaturesApplied } = useSignature();
+
   const activeFiles = selectors.getFiles();
   const filesSignature = selectors.getFilesSignature();
 
@@ -98,8 +102,14 @@ export default function RightRail() {
     }
   }, [currentView, setSelectedFiles, pageEditorFunctions]);
 
-  const handleExportAll = useCallback(() => {
+  const handleExportAll = useCallback(async () => {
     if (currentView === 'viewer') {
+      // Check if signatures have been applied
+      if (!signaturesApplied) {
+        alert('You have unapplied signatures. Please use "Apply Signatures" first before exporting.');
+        return;
+      }
+
       // Use EmbedPDF export functionality for viewer mode
       viewerContext?.exportActions?.download();
     } else if (currentView === 'fileEditor') {
@@ -119,7 +129,7 @@ export default function RightRail() {
       // Export all pages (not just selected)
       pageEditorFunctions?.onExportAll?.();
     }
-  }, [currentView, activeFiles, selectedFiles, pageEditorFunctions, viewerContext]);
+  }, [currentView, activeFiles, selectedFiles, pageEditorFunctions, viewerContext, signaturesApplied, selectors, fileActions]);
 
   const handleCloseSelected = useCallback(() => {
     if (currentView !== 'fileEditor') return;

frontend/src/components/tools/sign/PenSizeSelector.tsx

@@ -0,0 +1,86 @@
+import React from 'react';
+import { TextInput, Combobox, useCombobox } from '@mantine/core';
+
+interface PenSizeSelectorProps {
+  value: number;
+  inputValue: string;
+  onValueChange: (size: number) => void;
+  onInputChange: (input: string) => void;
+  disabled?: boolean;
+  placeholder?: string;
+  style?: React.CSSProperties;
+  size?: string;
+}
+
+const PenSizeSelector = ({
+  value,
+  inputValue,
+  onValueChange,
+  onInputChange,
+  disabled = false,
+  placeholder = "Type or select pen size (1-200)",
+  style,
+  size
+}: PenSizeSelectorProps) => {
+  const combobox = useCombobox();
+
+  const penSizeOptions = ['1', '2', '3', '4', '5', '8', '10', '12', '15', '20'];
+
+  return (
+    <Combobox
+      onOptionSubmit={(optionValue) => {
+        const penSize = parseInt(optionValue);
+        if (!isNaN(penSize)) {
+          onValueChange(penSize);
+          onInputChange(optionValue);
+        }
+        combobox.closeDropdown();
+      }}
+      store={combobox}
+      withinPortal={false}
+    >
+      <Combobox.Target>
+        <TextInput
+          placeholder={placeholder}
+          size={size}
+          value={inputValue}
+          onChange={(event) => {
+            const inputVal = event.currentTarget.value;
+            onInputChange(inputVal);
+
+            const penSize = parseInt(inputVal);
+            if (!isNaN(penSize) && penSize >= 1 && penSize <= 200) {
+              onValueChange(penSize);
+            }
+
+            combobox.openDropdown();
+            combobox.updateSelectedOptionIndex();
+          }}
+          onClick={() => combobox.openDropdown()}
+          onFocus={() => combobox.openDropdown()}
+          onBlur={() => {
+            combobox.closeDropdown();
+            const penSize = parseInt(inputValue);
+            if (isNaN(penSize) || penSize < 1 || penSize > 200) {
+              onInputChange(value.toString());
+            }
+          }}
+          disabled={disabled}
+          style={style}
+        />
+      </Combobox.Target>
+
+      <Combobox.Dropdown>
+        <Combobox.Options>
+          {penSizeOptions.map((sizeOption) => (
+            <Combobox.Option value={sizeOption} key={sizeOption}>
+              {sizeOption}px
+            </Combobox.Option>
+          ))}
+        </Combobox.Options>
+      </Combobox.Dropdown>
+    </Combobox>
+  );
+};
+
+export default PenSizeSelector;

frontend/src/components/tools/sign/SignSettings.tsx

@@ -0,0 +1,259 @@
+import React, { useState, useEffect } from 'react';
+import { useTranslation } from "react-i18next";
+import { Stack, Button, Text, Alert, Tabs } from '@mantine/core';
+import { SignParameters } from "../../../hooks/tools/sign/useSignParameters";
+import { SuggestedToolsSection } from "../shared/SuggestedToolsSection";
+
+// Import the new reusable components
+import { DrawingCanvas } from "../../annotation/shared/DrawingCanvas";
+import { DrawingControls } from "../../annotation/shared/DrawingControls";
+import { ImageUploader } from "../../annotation/shared/ImageUploader";
+import { TextInputWithFont } from "../../annotation/shared/TextInputWithFont";
+import { ColorPicker } from "../../annotation/shared/ColorPicker";
+
+interface SignSettingsProps {
+  parameters: SignParameters;
+  onParameterChange: <K extends keyof SignParameters>(key: K, value: SignParameters[K]) => void;
+  disabled?: boolean;
+  onActivateDrawMode?: () => void;
+  onActivateSignaturePlacement?: () => void;
+  onDeactivateSignature?: () => void;
+  onUpdateDrawSettings?: (color: string, size: number) => void;
+  onUndo?: () => void;
+  onRedo?: () => void;
+  onSave?: () => void;
+}
+
+const SignSettings = ({
+  parameters,
+  onParameterChange,
+  disabled = false,
+  onActivateSignaturePlacement,
+  onDeactivateSignature,
+  onUndo,
+  onRedo,
+  onSave
+}: SignSettingsProps) => {
+  const { t } = useTranslation();
+
+  // State for drawing
+  const [selectedColor, setSelectedColor] = useState('#000000');
+  const [penSize, setPenSize] = useState(2);
+  const [penSizeInput, setPenSizeInput] = useState('2');
+  const [isColorPickerOpen, setIsColorPickerOpen] = useState(false);
+
+  // State for different signature types
+  const [canvasSignatureData, setCanvasSignatureData] = useState<string | null>(null);
+  const [imageSignatureData, setImageSignatureData] = useState<string | null>(null);
+
+  // Handle image upload
+  const handleImageChange = async (file: File | null) => {
+    if (file && !disabled) {
+      try {
+        const result = await new Promise<string>((resolve, reject) => {
+          const reader = new FileReader();
+          reader.onload = (e) => {
+            if (e.target?.result) {
+              resolve(e.target.result as string);
+            } else {
+              reject(new Error('Failed to read file'));
+            }
+          };
+          reader.onerror = () => reject(reader.error);
+          reader.readAsDataURL(file);
+        });
+
+        // Clear any existing canvas signatures when uploading image
+        setCanvasSignatureData(null);
+        setImageSignatureData(result);
+      } catch (error) {
+        console.error('Error reading file:', error);
+      }
+    } else if (!file) {
+      setImageSignatureData(null);
+      if (onDeactivateSignature) {
+        onDeactivateSignature();
+      }
+    }
+  };
+
+  // Handle signature data changes
+  const handleCanvasSignatureChange = (data: string | null) => {
+    setCanvasSignatureData(prev => {
+      if (prev === data) return prev; // Prevent unnecessary updates
+      return data;
+    });
+    if (data) {
+      // Clear image data when canvas is used
+      setImageSignatureData(null);
+    }
+  };
+
+  // Handle signature mode deactivation when switching types
+  useEffect(() => {
+    if (parameters.signatureType !== 'text' && onDeactivateSignature) {
+      onDeactivateSignature();
+    }
+  }, [parameters.signatureType]);
+
+  // Handle text signature activation
+  useEffect(() => {
+    if (parameters.signatureType === 'text' && parameters.signerName && parameters.signerName.trim() !== '') {
+      if (onActivateSignaturePlacement) {
+        setTimeout(() => {
+          onActivateSignaturePlacement();
+        }, 100);
+      }
+    } else if (parameters.signatureType === 'text' && (!parameters.signerName || parameters.signerName.trim() === '')) {
+      if (onDeactivateSignature) {
+        onDeactivateSignature();
+      }
+    }
+  }, [parameters.signatureType, parameters.signerName, onActivateSignaturePlacement, onDeactivateSignature]);
+
+  // Handle signature data updates
+  useEffect(() => {
+    let newSignatureData: string | undefined = undefined;
+
+    if (parameters.signatureType === 'image' && imageSignatureData) {
+      newSignatureData = imageSignatureData;
+    } else if (parameters.signatureType === 'canvas' && canvasSignatureData) {
+      newSignatureData = canvasSignatureData;
+    }
+
+    // Only update if the signature data has actually changed
+    if (parameters.signatureData !== newSignatureData) {
+      onParameterChange('signatureData', newSignatureData);
+    }
+  }, [parameters.signatureType, parameters.signatureData, canvasSignatureData, imageSignatureData]);
+
+  // Handle image signature activation - activate when image data syncs with parameters
+  useEffect(() => {
+    if (parameters.signatureType === 'image' && imageSignatureData && parameters.signatureData === imageSignatureData && onActivateSignaturePlacement) {
+      setTimeout(() => {
+        onActivateSignaturePlacement();
+      }, 100);
+    }
+  }, [parameters.signatureType, parameters.signatureData, imageSignatureData]);
+
+  // Draw settings are no longer needed since draw mode is removed
+
+  return (
+    <Stack gap="md">
+      {/* Signature Type Selection */}
+      <Tabs
+        value={parameters.signatureType}
+        onChange={(value) => onParameterChange('signatureType', value as 'image' | 'text' | 'canvas')}
+      >
+        <Tabs.List grow>
+          <Tabs.Tab value="canvas" style={{ fontSize: '0.8rem' }}>
+            {t('sign.type.canvas', 'Canvas')}
+          </Tabs.Tab>
+          <Tabs.Tab value="image" style={{ fontSize: '0.8rem' }}>
+            {t('sign.type.image', 'Image')}
+          </Tabs.Tab>
+          <Tabs.Tab value="text" style={{ fontSize: '0.8rem' }}>
+            {t('sign.type.text', 'Text')}
+          </Tabs.Tab>
+        </Tabs.List>
+      </Tabs>
+
+      {/* Drawing Controls */}
+      <DrawingControls
+        onUndo={onUndo}
+        onRedo={onRedo}
+        onPlaceSignature={() => {
+          if (onActivateSignaturePlacement) {
+            onActivateSignaturePlacement();
+          }
+        }}
+        hasSignatureData={!!(canvasSignatureData || imageSignatureData || (parameters.signerName && parameters.signerName.trim() !== ''))}
+        disabled={disabled}
+        showPlaceButton={false}
+        placeButtonText="Update and Place"
+      />
+
+      {/* Signature Creation based on type */}
+      {parameters.signatureType === 'canvas' && (
+        <DrawingCanvas
+          selectedColor={selectedColor}
+          penSize={penSize}
+          penSizeInput={penSizeInput}
+          onColorSwatchClick={() => setIsColorPickerOpen(true)}
+          onPenSizeChange={setPenSize}
+          onPenSizeInputChange={setPenSizeInput}
+          onSignatureDataChange={handleCanvasSignatureChange}
+          disabled={disabled}
+          additionalButtons={
+            <Button
+              onClick={() => {
+                if (onActivateSignaturePlacement) {
+                  onActivateSignaturePlacement();
+                }
+              }}
+              color="blue"
+              variant="filled"
+              disabled={disabled || !canvasSignatureData}
+            >
+              Update and Place
+            </Button>
+          }
+        />
+      )}
+
+      {parameters.signatureType === 'image' && (
+        <ImageUploader
+          onImageChange={handleImageChange}
+          disabled={disabled}
+        />
+      )}
+
+      {parameters.signatureType === 'text' && (
+        <TextInputWithFont
+          text={parameters.signerName || ''}
+          onTextChange={(text) => onParameterChange('signerName', text)}
+          fontSize={parameters.fontSize || 16}
+          onFontSizeChange={(size) => onParameterChange('fontSize', size)}
+          fontFamily={parameters.fontFamily || 'Helvetica'}
+          onFontFamilyChange={(family) => onParameterChange('fontFamily', family)}
+          disabled={disabled}
+        />
+      )}
+
+
+      {/* Instructions for placing signature */}
+      <Alert color="blue" title={t('sign.instructions.title', 'How to add signature')}>
+        <Text size="sm">
+          {parameters.signatureType === 'canvas' && 'After drawing your signature in the canvas above, click "Update and Place" then click anywhere on the PDF to place it.'}
+          {parameters.signatureType === 'image' && 'After uploading your signature image above, click anywhere on the PDF to place it.'}
+          {parameters.signatureType === 'text' && 'After entering your name above, click anywhere on the PDF to place your signature.'}
+        </Text>
+      </Alert>
+
+      {/* Color Picker Modal */}
+      <ColorPicker
+        isOpen={isColorPickerOpen}
+        onClose={() => setIsColorPickerOpen(false)}
+        selectedColor={selectedColor}
+        onColorChange={setSelectedColor}
+      />
+
+      {/* Apply Signatures Button */}
+      {onSave && (
+        <Button
+          onClick={onSave}
+          color="blue"
+          variant="filled"
+          fullWidth
+        >
+          {t('sign.applySignatures', 'Apply Signatures')}
+        </Button>
+      )}
+
+      {/* Suggested Tools Section */}
+      <SuggestedToolsSection />
+    </Stack>
+  );
+};
+
+export default SignSettings;

frontend/src/components/viewer/EmbedPdfViewer.tsx

@@ -9,6 +9,8 @@ import { useViewer } from "../../contexts/ViewerContext";
 import { LocalEmbedPDF } from './LocalEmbedPDF';
 import { PdfViewerToolbar } from './PdfViewerToolbar';
 import { ThumbnailSidebar } from './ThumbnailSidebar';
+import { useNavigationState } from '../../contexts/NavigationContext';
+import { useSignature } from '../../contexts/SignatureContext';
 
 export interface EmbedPdfViewerProps {
   sidebarsVisible: boolean;
@@ -33,6 +35,12 @@ const EmbedPdfViewerContent = ({
   const zoomState = getZoomState();
   const spreadState = getSpreadState();
 
+  // Check if we're in signature mode
+  const { selectedTool } = useNavigationState();
+  const isSignatureMode = selectedTool === 'sign';
+
+  // Get signature context
+  const { signatureApiRef, historyApiRef } = useSignature();
 
   // Get current file from FileContext
   const { selectors } = useFileState();
@@ -178,6 +186,13 @@ const EmbedPdfViewerContent = ({
             <LocalEmbedPDF
               file={effectiveFile.file}
               url={effectiveFile.url}
+              enableSignature={isSignatureMode}
+              signatureApiRef={signatureApiRef as React.RefObject<any>}
+              historyApiRef={historyApiRef as React.RefObject<any>}
+              onSignatureAdded={() => {
+                // Handle signature added - for debugging, enable console logs as needed
+                // Future: Handle signature completion
+              }}
             />
           </Box>
         </>

frontend/src/components/viewer/HistoryAPIBridge.tsx

@@ -0,0 +1,116 @@
+import { useImperativeHandle, forwardRef, useEffect } from 'react';
+import { useHistoryCapability } from '@embedpdf/plugin-history/react';
+import { useAnnotationCapability } from '@embedpdf/plugin-annotation/react';
+import { useSignature } from '../../contexts/SignatureContext';
+import { uuidV4 } from '@embedpdf/models';
+
+export interface HistoryAPI {
+  undo: () => void;
+  redo: () => void;
+  canUndo: () => boolean;
+  canRedo: () => boolean;
+}
+
+export const HistoryAPIBridge = forwardRef<HistoryAPI>(function HistoryAPIBridge(_, ref) {
+  const { provides: historyApi } = useHistoryCapability();
+  const { provides: annotationApi } = useAnnotationCapability();
+  const { getImageData, storeImageData } = useSignature();
+
+  // Monitor annotation events to detect when annotations are restored
+  useEffect(() => {
+    if (!annotationApi) return;
+
+    const handleAnnotationEvent = (event: any) => {
+      const annotation = event.annotation;
+
+      // Store image data for all STAMP annotations immediately when created or modified
+      if (annotation && annotation.type === 13 && annotation.id && annotation.imageSrc) {
+        const storedImageData = getImageData(annotation.id);
+        if (!storedImageData || storedImageData !== annotation.imageSrc) {
+          storeImageData(annotation.id, annotation.imageSrc);
+        }
+      }
+
+      // Handle annotation restoration after undo operations
+      if (event.type === 'create' && event.committed) {
+        // Check if this is a STAMP annotation (signature) that might need image data restoration
+        if (annotation && annotation.type === 13 && annotation.id) {
+          getImageData(annotation.id);
+
+          // Delay the check to allow the annotation to be fully created
+          setTimeout(() => {
+            const currentStoredData = getImageData(annotation.id);
+            // Check if the annotation lacks image data but we have it stored
+            if (currentStoredData && (!annotation.imageSrc || annotation.imageSrc !== currentStoredData)) {
+              
+              // Generate new ID to avoid React key conflicts
+              const newId = uuidV4();
+
+              // Recreation with stored image data
+              const restoredData = {
+                type: annotation.type,
+                rect: annotation.rect,
+                author: annotation.author || 'Digital Signature',
+                subject: annotation.subject || 'Digital Signature',
+                pageIndex: event.pageIndex,
+                id: newId,
+                created: annotation.created || new Date(),
+                imageSrc: currentStoredData
+              };
+
+              // Update stored data to use new ID
+              storeImageData(newId, currentStoredData);
+
+              // Replace the annotation with one that has proper image data
+              try {
+                annotationApi.deleteAnnotation(event.pageIndex, annotation.id);
+                // Small delay to ensure deletion completes
+                setTimeout(() => {
+                  annotationApi.createAnnotation(event.pageIndex, restoredData);
+                }, 50);
+              } catch (error) {
+                console.error('HistoryAPI: Failed to restore annotation:', error);
+              }
+            }
+          }, 100);
+        }
+      }
+    };
+
+    // Add the event listener
+    annotationApi.onAnnotationEvent(handleAnnotationEvent);
+
+    // Cleanup function
+    return () => {
+      // Note: EmbedPDF doesn't provide a way to remove event listeners
+      // This is a limitation of the current API
+    };
+  }, [annotationApi, getImageData, storeImageData]);
+
+
+  useImperativeHandle(ref, () => ({
+    undo: () => {
+      if (historyApi) {
+        historyApi.undo();
+      }
+    },
+
+    redo: () => {
+      if (historyApi) {
+        historyApi.redo();
+      }
+    },
+
+    canUndo: () => {
+      return historyApi ? historyApi.canUndo() : false;
+    },
+
+    canRedo: () => {
+      return historyApi ? historyApi.canRedo() : false;
+    },
+  }), [historyApi]);
+
+  return null; // This is a bridge component with no UI
+});
+
+HistoryAPIBridge.displayName = 'HistoryAPIBridge';

frontend/src/components/viewer/LocalEmbedPDF.tsx

@@ -19,6 +19,11 @@ import { ThumbnailPluginPackage } from '@embedpdf/plugin-thumbnail/react';
 import { RotatePluginPackage, Rotate } from '@embedpdf/plugin-rotate/react';
 import { ExportPluginPackage } from '@embedpdf/plugin-export/react';
 import { Rotation } from '@embedpdf/models';
+
+// Import annotation plugins
+import { HistoryPluginPackage } from '@embedpdf/plugin-history/react';
+import { AnnotationLayer, AnnotationPluginPackage } from '@embedpdf/plugin-annotation/react';
+import { PdfAnnotationSubtype } from '@embedpdf/models';
 import { CustomSearchLayer } from './CustomSearchLayer';
 import { ZoomAPIBridge } from './ZoomAPIBridge';
 import ToolLoadingFallback from '../tools/ToolLoadingFallback';
@@ -30,15 +35,22 @@ import { SpreadAPIBridge } from './SpreadAPIBridge';
 import { SearchAPIBridge } from './SearchAPIBridge';
 import { ThumbnailAPIBridge } from './ThumbnailAPIBridge';
 import { RotateAPIBridge } from './RotateAPIBridge';
+import { SignatureAPIBridge, SignatureAPI } from './SignatureAPIBridge';
+import { HistoryAPIBridge, HistoryAPI } from './HistoryAPIBridge';
 import { ExportAPIBridge } from './ExportAPIBridge';
 
 interface LocalEmbedPDFProps {
   file?: File | Blob;
   url?: string | null;
+  enableSignature?: boolean;
+  onSignatureAdded?: (annotation: any) => void;
+  signatureApiRef?: React.RefObject<SignatureAPI>;
+  historyApiRef?: React.RefObject<HistoryAPI>;
 }
 
-export function LocalEmbedPDF({ file, url }: LocalEmbedPDFProps) {
+export function LocalEmbedPDF({ file, url, enableSignature = false, onSignatureAdded, signatureApiRef, historyApiRef }: LocalEmbedPDFProps) {
   const [pdfUrl, setPdfUrl] = useState<string | null>(null);
+  const [, setAnnotations] = useState<Array<{id: string, pageIndex: number, rect: any}>>([]);
 
   // Convert File to URL if needed
   useEffect(() => {
@@ -80,6 +92,17 @@ export function LocalEmbedPDF({ file, url }: LocalEmbedPDFProps) {
       // Register selection plugin (depends on InteractionManager)
       createPluginRegistration(SelectionPluginPackage),
 
+      // Register history plugin for undo/redo (recommended for annotations)
+      ...(enableSignature ? [createPluginRegistration(HistoryPluginPackage)] : []),
+
+      // Register annotation plugin (depends on InteractionManager, Selection, History)
+      ...(enableSignature ? [createPluginRegistration(AnnotationPluginPackage, {
+        annotationAuthor: 'Digital Signature',
+        autoCommit: true,
+        deactivateToolAfterCreate: false,
+        selectAfterCreate: true,
+      })] : []),
+
       // Register pan plugin (depends on Viewport, InteractionManager)
       createPluginRegistration(PanPluginPackage, {
         defaultMode: 'mobile', // Try mobile mode which might be more permissive
@@ -168,7 +191,72 @@ export function LocalEmbedPDF({ file, url }: LocalEmbedPDFProps) {
       minHeight: 0,
       minWidth: 0
     }}>
-      <EmbedPDF engine={engine} plugins={plugins}>
+      <EmbedPDF
+        engine={engine}
+        plugins={plugins}
+        onInitialized={enableSignature ? async (registry) => {
+          const annotationPlugin = registry.getPlugin('annotation');
+          if (!annotationPlugin || !annotationPlugin.provides) return;
+
+          const annotationApi = annotationPlugin.provides();
+          if (!annotationApi) return;
+
+          // Add custom signature stamp tool for image signatures
+          annotationApi.addTool({
+            id: 'signatureStamp',
+            name: 'Digital Signature',
+            interaction: { exclusive: false, cursor: 'copy' },
+            matchScore: () => 0,
+            defaults: {
+              type: PdfAnnotationSubtype.STAMP,
+              // Image will be set dynamically when signature is created
+            },
+          });
+
+          // Add custom ink signature tool for drawn signatures
+          annotationApi.addTool({
+            id: 'signatureInk',
+            name: 'Signature Draw',
+            interaction: { exclusive: true, cursor: 'crosshair' },
+            matchScore: () => 0,
+            defaults: {
+              type: PdfAnnotationSubtype.INK,
+              color: '#000000',
+              opacity: 1.0,
+              borderWidth: 2,
+            },
+          });
+
+          // Listen for annotation events to track annotations and notify parent
+          annotationApi.onAnnotationEvent((event: any) => {
+            if (event.type === 'create' && event.committed) {
+              // Add to annotations list
+              setAnnotations(prev => [...prev, {
+                id: event.annotation.id,
+                pageIndex: event.pageIndex,
+                rect: event.annotation.rect
+              }]);
+
+
+              // Notify parent if callback provided
+              if (onSignatureAdded) {
+                onSignatureAdded(event.annotation);
+              }
+            } else if (event.type === 'delete' && event.committed) {
+              // Remove from annotations list
+              setAnnotations(prev => prev.filter(ann => ann.id !== event.annotation.id));
+            } else if (event.type === 'loaded') {
+              // Handle initial load of annotations
+              const loadedAnnotations = event.annotations || [];
+              setAnnotations(loadedAnnotations.map((ann: any) => ({
+                id: ann.id,
+                pageIndex: ann.pageIndex || 0,
+                rect: ann.rect
+              })));
+            }
+          });
+        } : undefined}
+      >
         <ZoomAPIBridge />
         <ScrollAPIBridge />
         <SelectionAPIBridge />
@@ -177,6 +265,8 @@ export function LocalEmbedPDF({ file, url }: LocalEmbedPDFProps) {
         <SearchAPIBridge />
         <ThumbnailAPIBridge />
         <RotateAPIBridge />
+        {enableSignature && <SignatureAPIBridge ref={signatureApiRef} />}
+        {enableSignature && <HistoryAPIBridge ref={historyApiRef} />}
         <ExportAPIBridge />
         <GlobalPointerProvider>
           <Viewport
@@ -221,6 +311,17 @@ export function LocalEmbedPDF({ file, url }: LocalEmbedPDFProps) {
 
                     {/* Selection layer for text interaction */}
                     <SelectionLayer pageIndex={pageIndex} scale={scale} />
+                    {/* Annotation layer for signatures (only when enabled) */}
+                    {enableSignature && (
+                      <AnnotationLayer
+                        pageIndex={pageIndex}
+                        scale={scale}
+                        pageWidth={width}
+                        pageHeight={height}
+                        rotation={rotation || 0}
+                        selectionOutlineColor="#007ACC"
+                      />
+                    )}
                   </div>
                 </PagePointerProvider>
               </Rotate>

frontend/src/components/viewer/LocalEmbedPDFWithAnnotations.tsx

@@ -0,0 +1,315 @@
+import React, { useEffect, useMemo, useState } from 'react';
+import { createPluginRegistration } from '@embedpdf/core';
+import { EmbedPDF } from '@embedpdf/core/react';
+import { usePdfiumEngine } from '@embedpdf/engines/react';
+
+// Import the essential plugins
+import { Viewport, ViewportPluginPackage } from '@embedpdf/plugin-viewport/react';
+import { Scroller, ScrollPluginPackage, ScrollStrategy } from '@embedpdf/plugin-scroll/react';
+import { LoaderPluginPackage } from '@embedpdf/plugin-loader/react';
+import { RenderPluginPackage } from '@embedpdf/plugin-render/react';
+import { ZoomPluginPackage } from '@embedpdf/plugin-zoom/react';
+import { InteractionManagerPluginPackage, PagePointerProvider, GlobalPointerProvider } from '@embedpdf/plugin-interaction-manager/react';
+import { SelectionLayer, SelectionPluginPackage } from '@embedpdf/plugin-selection/react';
+import { TilingLayer, TilingPluginPackage } from '@embedpdf/plugin-tiling/react';
+import { PanPluginPackage } from '@embedpdf/plugin-pan/react';
+import { SpreadPluginPackage, SpreadMode } from '@embedpdf/plugin-spread/react';
+import { SearchPluginPackage } from '@embedpdf/plugin-search/react';
+import { ThumbnailPluginPackage } from '@embedpdf/plugin-thumbnail/react';
+import { RotatePluginPackage, Rotate } from '@embedpdf/plugin-rotate/react';
+import { Rotation } from '@embedpdf/models';
+
+// Import annotation plugins
+import { HistoryPluginPackage } from '@embedpdf/plugin-history/react';
+import { AnnotationLayer, AnnotationPluginPackage } from '@embedpdf/plugin-annotation/react';
+import { PdfAnnotationSubtype } from '@embedpdf/models';
+
+import { CustomSearchLayer } from './CustomSearchLayer';
+import { ZoomAPIBridge } from './ZoomAPIBridge';
+import ToolLoadingFallback from '../tools/ToolLoadingFallback';
+import { Center, Stack, Text } from '@mantine/core';
+import { ScrollAPIBridge } from './ScrollAPIBridge';
+import { SelectionAPIBridge } from './SelectionAPIBridge';
+import { PanAPIBridge } from './PanAPIBridge';
+import { SpreadAPIBridge } from './SpreadAPIBridge';
+import { SearchAPIBridge } from './SearchAPIBridge';
+import { ThumbnailAPIBridge } from './ThumbnailAPIBridge';
+import { RotateAPIBridge } from './RotateAPIBridge';
+
+interface LocalEmbedPDFWithAnnotationsProps {
+  file?: File | Blob;
+  url?: string | null;
+  onAnnotationChange?: (annotations: any[]) => void;
+}
+
+export function LocalEmbedPDFWithAnnotations({
+  file,
+  url,
+  onAnnotationChange
+}: LocalEmbedPDFWithAnnotationsProps) {
+  const [pdfUrl, setPdfUrl] = useState<string | null>(null);
+
+  // Convert File to URL if needed
+  useEffect(() => {
+    if (file) {
+      const objectUrl = URL.createObjectURL(file);
+      setPdfUrl(objectUrl);
+      return () => URL.revokeObjectURL(objectUrl);
+    } else if (url) {
+      setPdfUrl(url);
+    }
+  }, [file, url]);
+
+  // Create plugins configuration with annotation support
+  const plugins = useMemo(() => {
+    if (!pdfUrl) return [];
+
+    return [
+      createPluginRegistration(LoaderPluginPackage, {
+        loadingOptions: {
+          type: 'url',
+          pdfFile: {
+            id: 'stirling-pdf-signing-viewer',
+            url: pdfUrl,
+          },
+        },
+      }),
+      createPluginRegistration(ViewportPluginPackage, {
+        viewportGap: 10,
+      }),
+      createPluginRegistration(ScrollPluginPackage, {
+        strategy: ScrollStrategy.Vertical,
+        initialPage: 0,
+      }),
+      createPluginRegistration(RenderPluginPackage),
+
+      // Register interaction manager (required for annotations)
+      createPluginRegistration(InteractionManagerPluginPackage),
+
+      // Register selection plugin (depends on InteractionManager)
+      createPluginRegistration(SelectionPluginPackage),
+
+      // Register history plugin for undo/redo (recommended for annotations)
+      createPluginRegistration(HistoryPluginPackage),
+
+      // Register annotation plugin (depends on InteractionManager, Selection, History)
+      createPluginRegistration(AnnotationPluginPackage, {
+        annotationAuthor: 'Digital Signature',
+        autoCommit: true,
+        deactivateToolAfterCreate: false,
+        selectAfterCreate: true,
+      }),
+
+      // Register pan plugin
+      createPluginRegistration(PanPluginPackage, {
+        defaultMode: 'mobile',
+      }),
+
+      // Register zoom plugin
+      createPluginRegistration(ZoomPluginPackage, {
+        defaultZoomLevel: 1.4,
+        minZoom: 0.2,
+        maxZoom: 3.0,
+      }),
+
+      // Register tiling plugin
+      createPluginRegistration(TilingPluginPackage, {
+        tileSize: 768,
+        overlapPx: 5,
+        extraRings: 1,
+      }),
+
+      // Register spread plugin
+      createPluginRegistration(SpreadPluginPackage, {
+        defaultSpreadMode: SpreadMode.None,
+      }),
+
+      // Register search plugin
+      createPluginRegistration(SearchPluginPackage),
+
+      // Register thumbnail plugin
+      createPluginRegistration(ThumbnailPluginPackage),
+
+      // Register rotate plugin
+      createPluginRegistration(RotatePluginPackage, {
+        defaultRotation: Rotation.Degree0,
+      }),
+    ];
+  }, [pdfUrl]);
+
+  // Initialize the engine
+  const { engine, isLoading, error } = usePdfiumEngine();
+
+  // Early return if no file or URL provided
+  if (!file && !url) {
+    return (
+      <Center h="100%" w="100%">
+        <Stack align="center" gap="md">
+          <div style={{ fontSize: '24px' }}>📄</div>
+          <Text c="dimmed" size="sm">
+            No PDF provided
+          </Text>
+        </Stack>
+      </Center>
+    );
+  }
+
+  if (isLoading || !engine || !pdfUrl) {
+    return <ToolLoadingFallback toolName="PDF Engine" />;
+  }
+
+  if (error) {
+    return (
+      <Center h="100%" w="100%">
+        <Stack align="center" gap="md">
+          <div style={{ fontSize: '24px' }}>❌</div>
+          <Text c="red" size="sm" style={{ textAlign: 'center' }}>
+            Error loading PDF engine: {error.message}
+          </Text>
+        </Stack>
+      </Center>
+    );
+  }
+
+  return (
+    <div style={{
+      height: '100%',
+      width: '100%',
+      position: 'relative',
+      overflow: 'hidden',
+      flex: 1,
+      minHeight: 0,
+      minWidth: 0
+    }}>
+      <EmbedPDF
+        engine={engine}
+        plugins={plugins}
+        onInitialized={async (registry) => {
+          const annotationPlugin = registry.getPlugin('annotation');
+          if (!annotationPlugin || !annotationPlugin.provides) return;
+
+          const annotationApi = annotationPlugin.provides();
+          if (!annotationApi) return;
+
+          // Add custom signature stamp tool
+          annotationApi.addTool({
+            id: 'signatureStamp',
+            name: 'Digital Signature',
+            interaction: { exclusive: false, cursor: 'copy' },
+            matchScore: () => 0,
+            defaults: {
+              type: PdfAnnotationSubtype.STAMP,
+              // Will be set dynamically when user creates signature
+            },
+          });
+
+          // Add custom ink signature tool
+          annotationApi.addTool({
+            id: 'signatureInk',
+            name: 'Signature Draw',
+            interaction: { exclusive: true, cursor: 'crosshair' },
+            matchScore: () => 0,
+            defaults: {
+              type: PdfAnnotationSubtype.INK,
+              color: '#000000',
+              opacity: 1.0,
+              borderWidth: 2,
+            },
+          });
+
+          // Listen for annotation events to notify parent
+          if (onAnnotationChange) {
+            annotationApi.onAnnotationEvent((event: any) => {
+              if (event.committed) {
+                // Get all annotations and notify parent
+                // This is a simplified approach - in reality you'd need to get all annotations
+                onAnnotationChange([event.annotation]);
+              }
+            });
+          }
+        }}
+      >
+        <ZoomAPIBridge />
+        <ScrollAPIBridge />
+        <SelectionAPIBridge />
+        <PanAPIBridge />
+        <SpreadAPIBridge />
+        <SearchAPIBridge />
+        <ThumbnailAPIBridge />
+        <RotateAPIBridge />
+        <GlobalPointerProvider>
+          <Viewport
+            style={{
+              backgroundColor: 'var(--bg-surface)',
+              height: '100%',
+              width: '100%',
+              maxHeight: '100%',
+              maxWidth: '100%',
+              overflow: 'auto',
+              position: 'relative',
+              flex: 1,
+              minHeight: 0,
+              minWidth: 0,
+              contain: 'strict',
+            }}
+          >
+            <Scroller
+              renderPage={({ width, height, pageIndex, scale, rotation }: {
+                width: number;
+                height: number;
+                pageIndex: number;
+                scale: number;
+                rotation?: number;
+              }) => (
+                <Rotate pageSize={{ width, height }}>
+                  <PagePointerProvider {...{
+                    pageWidth: width,
+                    pageHeight: height,
+                    pageIndex,
+                    scale,
+                    rotation: rotation || 0
+                  }}>
+                    <div
+                      style={{
+                        width,
+                        height,
+                        position: 'relative',
+                        userSelect: 'none',
+                        WebkitUserSelect: 'none',
+                        MozUserSelect: 'none',
+                        msUserSelect: 'none'
+                      }}
+                      draggable={false}
+                      onDragStart={(e) => e.preventDefault()}
+                      onDrop={(e) => e.preventDefault()}
+                      onDragOver={(e) => e.preventDefault()}
+                    >
+                      {/* High-resolution tile layer */}
+                      <TilingLayer pageIndex={pageIndex} scale={scale} />
+
+                      {/* Search highlight layer */}
+                      <CustomSearchLayer pageIndex={pageIndex} scale={scale} />
+
+                      {/* Selection layer for text interaction */}
+                      <SelectionLayer pageIndex={pageIndex} scale={scale} />
+
+                      {/* Annotation layer for signatures */}
+                      <AnnotationLayer
+                        pageIndex={pageIndex}
+                        scale={scale}
+                        pageWidth={width}
+                        pageHeight={height}
+                        rotation={rotation || 0}
+                        selectionOutlineColor="#007ACC"
+                      />
+                    </div>
+                  </PagePointerProvider>
+                </Rotate>
+              )}
+            />
+          </Viewport>
+        </GlobalPointerProvider>
+      </EmbedPDF>
+    </div>
+  );
+}

frontend/src/components/viewer/SignatureAPIBridge.tsx

@@ -0,0 +1,370 @@
+import { useImperativeHandle, forwardRef, useEffect } from 'react';
+import { useAnnotationCapability } from '@embedpdf/plugin-annotation/react';
+import { PdfAnnotationSubtype, PdfStandardFont, PdfTextAlignment, PdfVerticalAlignment, uuidV4 } from '@embedpdf/models';
+import { SignParameters } from '../../hooks/tools/sign/useSignParameters';
+import { useSignature } from '../../contexts/SignatureContext';
+
+export interface SignatureAPI {
+  addImageSignature: (signatureData: string, x: number, y: number, width: number, height: number, pageIndex: number) => void;
+  addTextSignature: (text: string, x: number, y: number, pageIndex: number) => void;
+  activateDrawMode: () => void;
+  activateSignaturePlacementMode: () => void;
+  activateDeleteMode: () => void;
+  deleteAnnotation: (annotationId: string, pageIndex: number) => void;
+  updateDrawSettings: (color: string, size: number) => void;
+  deactivateTools: () => void;
+  applySignatureFromParameters: (params: SignParameters) => void;
+  getPageAnnotations: (pageIndex: number) => Promise<any[]>;
+}
+
+export const SignatureAPIBridge = forwardRef<SignatureAPI>(function SignatureAPIBridge(_, ref) {
+  const { provides: annotationApi } = useAnnotationCapability();
+  const { signatureConfig, storeImageData, isPlacementMode } = useSignature();
+
+
+  // Enable keyboard deletion of selected annotations - only when in signature placement mode
+  useEffect(() => {
+    if (!annotationApi || !isPlacementMode) return;
+
+    const handleKeyDown = (event: KeyboardEvent) => {
+      if (event.key === 'Delete' || event.key === 'Backspace') {
+        const selectedAnnotation = annotationApi.getSelectedAnnotation?.();
+
+        if (selectedAnnotation) {
+          const annotation = selectedAnnotation as any;
+          const pageIndex = annotation.object?.pageIndex || 0;
+          const id = annotation.object?.id;
+
+          // For STAMP annotations, ensure image data is preserved before deletion
+          if (annotation.object?.type === 13 && id) {
+            // Get current annotation data to ensure we have latest image data stored
+            const pageAnnotationsTask = annotationApi.getPageAnnotations?.({ pageIndex });
+            if (pageAnnotationsTask) {
+              pageAnnotationsTask.toPromise().then((pageAnnotations: any) => {
+                const currentAnn = pageAnnotations?.find((ann: any) => ann.id === id);
+                if (currentAnn && currentAnn.imageSrc) {
+                  // Ensure the image data is stored in our persistent store
+                  storeImageData(id, currentAnn.imageSrc);
+                }
+              }).catch(console.error);
+            }
+          }
+
+          // Use EmbedPDF's native deletion which should integrate with history
+          if ((annotationApi as any).deleteSelected) {
+            (annotationApi as any).deleteSelected();
+          } else {
+            // Fallback to direct deletion - less ideal for history
+            if (id) {
+              annotationApi.deleteAnnotation(pageIndex, id);
+            }
+          }
+        }
+      }
+    };
+
+    document.addEventListener('keydown', handleKeyDown);
+    return () => document.removeEventListener('keydown', handleKeyDown);
+  }, [annotationApi, storeImageData, isPlacementMode]);
+
+  useImperativeHandle(ref, () => ({
+    addImageSignature: (signatureData: string, x: number, y: number, width: number, height: number, pageIndex: number) => {
+      if (!annotationApi) return;
+
+      // Create image stamp annotation with proper image data
+
+      const annotationId = uuidV4();
+
+      // Store image data in our persistent store
+      storeImageData(annotationId, signatureData);
+
+      annotationApi.createAnnotation(pageIndex, {
+        type: PdfAnnotationSubtype.STAMP,
+        rect: {
+          origin: { x, y },
+          size: { width, height }
+        },
+        author: 'Digital Signature',
+        subject: 'Digital Signature',
+        pageIndex: pageIndex,
+        id: annotationId,
+        created: new Date(),
+        // Store image data in multiple places to ensure history captures it
+        imageSrc: signatureData,
+        contents: signatureData, // Some annotation systems use contents
+        data: signatureData, // Try data field
+        imageData: signatureData, // Try imageData field
+        appearance: signatureData // Try appearance field
+      });
+    },
+
+    addTextSignature: (text: string, x: number, y: number, pageIndex: number) => {
+      if (!annotationApi) return;
+
+      // Create text annotation for signature
+      annotationApi.createAnnotation(pageIndex, {
+        type: PdfAnnotationSubtype.FREETEXT,
+        rect: {
+          origin: { x, y },
+          size: { width: 200, height: 50 }
+        },
+        contents: text,
+        author: 'Digital Signature',
+        fontSize: 16,
+        fontColor: '#000000',
+        fontFamily: PdfStandardFont.Helvetica,
+        textAlign: PdfTextAlignment.Left,
+        verticalAlign: PdfVerticalAlignment.Top,
+        opacity: 1,
+        pageIndex: pageIndex,
+        id: uuidV4(),
+        created: new Date(),
+        customData: {
+          signatureText: text,
+          signatureType: 'text'
+        }
+      });
+    },
+
+    activateDrawMode: () => {
+      if (!annotationApi) return;
+
+      // Activate the built-in ink tool for drawing
+      annotationApi.setActiveTool('ink');
+
+      // Set default ink tool properties (black color, 2px width)
+      const activeTool = annotationApi.getActiveTool();
+      if (activeTool && activeTool.id === 'ink') {
+        annotationApi.setToolDefaults('ink', {
+          color: '#000000',
+          thickness: 2,
+          lineWidth: 2,
+          strokeWidth: 2,
+          width: 2
+        });
+      }
+    },
+
+    activateSignaturePlacementMode: () => {
+      if (!annotationApi || !signatureConfig) return;
+
+      try {
+        if (signatureConfig.signatureType === 'text' && signatureConfig.signerName) {
+          // Try different tool names for text annotations
+          const textToolNames = ['freetext', 'text', 'textbox', 'annotation-text'];
+          let activatedTool = null;
+
+          for (const toolName of textToolNames) {
+            annotationApi.setActiveTool(toolName);
+            const tool = annotationApi.getActiveTool();
+
+            if (tool && tool.id === toolName) {
+              activatedTool = tool;
+              annotationApi.setToolDefaults(toolName, {
+                contents: signatureConfig.signerName,
+                fontSize: signatureConfig.fontSize || 16,
+                fontFamily: signatureConfig.fontFamily === 'Times-Roman' ? PdfStandardFont.Times_Roman :
+                          signatureConfig.fontFamily === 'Courier' ? PdfStandardFont.Courier :
+                          PdfStandardFont.Helvetica,
+                fontColor: '#000000',
+              });
+              break;
+            }
+          }
+
+          if (!activatedTool) {
+            // Fallback: create a simple text image as stamp
+            const canvas = document.createElement('canvas');
+            const ctx = canvas.getContext('2d');
+            if (ctx) {
+              const fontSize = signatureConfig.fontSize || 16;
+              const fontFamily = signatureConfig.fontFamily || 'Helvetica';
+
+              canvas.width = Math.max(200, signatureConfig.signerName.length * fontSize * 0.6);
+              canvas.height = fontSize + 20;
+              ctx.fillStyle = '#000000';
+              ctx.font = `${fontSize}px ${fontFamily}`;
+              ctx.textAlign = 'left';
+              ctx.textBaseline = 'middle';
+              ctx.fillText(signatureConfig.signerName, 10, canvas.height / 2);
+              const dataURL = canvas.toDataURL();
+
+              annotationApi.setActiveTool('stamp');
+              const stampTool = annotationApi.getActiveTool();
+              if (stampTool && stampTool.id === 'stamp') {
+                annotationApi.setToolDefaults('stamp', {
+                  imageSrc: dataURL,
+                  subject: `Text Signature - ${signatureConfig.signerName}`,
+                });
+              }
+            }
+          }
+        } else if (signatureConfig.signatureData) {
+          // Use stamp tool for image/canvas signatures
+          annotationApi.setActiveTool('stamp');
+          const activeTool = annotationApi.getActiveTool();
+          if (activeTool && activeTool.id === 'stamp') {
+            annotationApi.setToolDefaults('stamp', {
+              imageSrc: signatureConfig.signatureData,
+              subject: `Digital Signature - ${signatureConfig.reason || 'Document signing'}`,
+            });
+          }
+        }
+      } catch (error) {
+        console.error('Error activating signature tool:', error);
+      }
+    },
+
+    updateDrawSettings: (color: string, size: number) => {
+      if (!annotationApi) return;
+
+      // Always update ink tool defaults - use multiple property names for compatibility
+      annotationApi.setToolDefaults('ink', {
+        color: color,
+        thickness: size,
+        lineWidth: size,
+        strokeWidth: size,
+        width: size
+      });
+
+      // Force reactivate ink tool to ensure new settings take effect
+      annotationApi.setActiveTool(null); // Deactivate first
+      setTimeout(() => {
+        annotationApi.setActiveTool('ink'); // Reactivate with new settings
+      }, 50);
+    },
+
+    activateDeleteMode: () => {
+      if (!annotationApi) return;
+      // Activate selection tool to allow selecting and deleting annotations
+      // Users can click annotations to select them, then press Delete key or right-click to delete
+      annotationApi.setActiveTool('select');
+    },
+
+    deleteAnnotation: (annotationId: string, pageIndex: number) => {
+      if (!annotationApi) return;
+
+      // Before deleting, try to preserve image data for potential undo
+      const pageAnnotationsTask = annotationApi.getPageAnnotations?.({ pageIndex });
+      if (pageAnnotationsTask) {
+        pageAnnotationsTask.toPromise().then((pageAnnotations: any) => {
+          const annotation = pageAnnotations?.find((ann: any) => ann.id === annotationId);
+          if (annotation && annotation.type === 13 && annotation.imageSrc) {
+            // Store image data before deletion
+            storeImageData(annotationId, annotation.imageSrc);
+          }
+        }).catch(console.error);
+      }
+
+      // Delete specific annotation by ID
+      annotationApi.deleteAnnotation(pageIndex, annotationId);
+    },
+
+    deactivateTools: () => {
+      if (!annotationApi) return;
+      annotationApi.setActiveTool(null);
+    },
+
+    applySignatureFromParameters: (params: SignParameters) => {
+      if (!annotationApi || !params.signaturePosition) return;
+
+      const { x, y, width, height, page } = params.signaturePosition;
+
+      switch (params.signatureType) {
+        case 'image':
+          if (params.signatureData) {
+            const annotationId = uuidV4();
+
+            // Store image data in our persistent store
+            storeImageData(annotationId, params.signatureData);
+
+            annotationApi.createAnnotation(page, {
+              type: PdfAnnotationSubtype.STAMP,
+              rect: {
+                origin: { x, y },
+                size: { width, height }
+              },
+              author: 'Digital Signature',
+              subject: `Digital Signature - ${params.reason || 'Document signing'}`,
+              pageIndex: page,
+              id: annotationId,
+              created: new Date(),
+              // Store image data in multiple places to ensure history captures it
+              imageSrc: params.signatureData,
+              contents: params.signatureData, // Some annotation systems use contents
+              data: params.signatureData, // Try data field
+              imageData: params.signatureData, // Try imageData field
+              appearance: params.signatureData // Try appearance field
+            });
+
+            // Switch to select mode after placing signature so it can be easily deleted
+            setTimeout(() => {
+              annotationApi.setActiveTool('select');
+            }, 100);
+          }
+          break;
+
+        case 'text':
+          if (params.signerName) {
+            annotationApi.createAnnotation(page, {
+              type: PdfAnnotationSubtype.FREETEXT,
+              rect: {
+                origin: { x, y },
+                size: { width, height }
+              },
+              contents: params.signerName,
+              author: 'Digital Signature',
+              fontSize: 16,
+              fontColor: '#000000',
+              fontFamily: PdfStandardFont.Helvetica,
+              textAlign: PdfTextAlignment.Left,
+              verticalAlign: PdfVerticalAlignment.Top,
+              opacity: 1,
+              pageIndex: page,
+              id: uuidV4(),
+              created: new Date(),
+              customData: {
+                signatureText: params.signerName,
+                signatureType: 'text'
+              }
+            });
+
+            // Switch to select mode after placing signature so it can be easily deleted
+            setTimeout(() => {
+              annotationApi.setActiveTool('select');
+            }, 100);
+          }
+          break;
+
+        case 'draw':
+          // For draw mode, we activate the tool and let user draw
+          annotationApi.setActiveTool('ink');
+          break;
+      }
+    },
+
+    getPageAnnotations: async (pageIndex: number): Promise<any[]> => {
+      if (!annotationApi || !annotationApi.getPageAnnotations) {
+        console.warn('getPageAnnotations not available');
+        return [];
+      }
+
+      try {
+        const pageAnnotationsTask = annotationApi.getPageAnnotations({ pageIndex });
+        if (pageAnnotationsTask && pageAnnotationsTask.toPromise) {
+          const annotations = await pageAnnotationsTask.toPromise();
+          return annotations || [];
+        }
+        return [];
+      } catch (error) {
+        console.error(`Error getting annotations for page ${pageIndex}:`, error);
+        return [];
+      }
+    },
+  }), [annotationApi, signatureConfig]);
+
+
+  return null; // This is a bridge component with no UI
+});
+
+SignatureAPIBridge.displayName = 'SignatureAPIBridge';

frontend/src/components/viewer/ThumbnailSidebar.tsx

@@ -25,7 +25,7 @@ export function ThumbnailSidebar({ visible, onToggle: _onToggle }: ThumbnailSide
       });
       setThumbnails({});
     }
-  }, [visible, thumbnails]);
+  }, [visible]); // Remove thumbnails from dependency to prevent infinite loop
 
   // Generate thumbnails when sidebar becomes visible
   useEffect(() => {

frontend/src/contexts/SignatureContext.tsx

@@ -0,0 +1,178 @@
+import React, { createContext, useContext, useState, ReactNode, useCallback, useRef } from 'react';
+import { SignParameters } from '../hooks/tools/sign/useSignParameters';
+import { SignatureAPI } from '../components/viewer/SignatureAPIBridge';
+import { HistoryAPI } from '../components/viewer/HistoryAPIBridge';
+
+// Signature state interface
+interface SignatureState {
+  // Current signature configuration from the tool
+  signatureConfig: SignParameters | null;
+  // Whether we're in signature placement mode
+  isPlacementMode: boolean;
+  // Whether signatures have been applied (allows export)
+  signaturesApplied: boolean;
+}
+
+// Signature actions interface
+interface SignatureActions {
+  setSignatureConfig: (config: SignParameters | null) => void;
+  setPlacementMode: (enabled: boolean) => void;
+  activateDrawMode: () => void;
+  deactivateDrawMode: () => void;
+  activateSignaturePlacementMode: () => void;
+  activateDeleteMode: () => void;
+  updateDrawSettings: (color: string, size: number) => void;
+  undo: () => void;
+  redo: () => void;
+  storeImageData: (id: string, data: string) => void;
+  getImageData: (id: string) => string | undefined;
+  setSignaturesApplied: (applied: boolean) => void;
+}
+
+// Combined context interface
+interface SignatureContextValue extends SignatureState, SignatureActions {
+  signatureApiRef: React.RefObject<SignatureAPI | null>;
+  historyApiRef: React.RefObject<HistoryAPI | null>;
+}
+
+// Create context
+const SignatureContext = createContext<SignatureContextValue | undefined>(undefined);
+
+// Initial state
+const initialState: SignatureState = {
+  signatureConfig: null,
+  isPlacementMode: false,
+  signaturesApplied: true, // Start as true (no signatures placed yet)
+};
+
+// Provider component
+export const SignatureProvider: React.FC<{ children: ReactNode }> = ({ children }) => {
+  const [state, setState] = useState<SignatureState>(initialState);
+  const signatureApiRef = useRef<SignatureAPI>(null);
+  const historyApiRef = useRef<HistoryAPI>(null);
+  const imageDataStore = useRef<Map<string, string>>(new Map());
+
+  // Actions
+  const setSignatureConfig = useCallback((config: SignParameters | null) => {
+    setState(prev => ({
+      ...prev,
+      signatureConfig: config,
+    }));
+  }, []);
+
+  const setPlacementMode = useCallback((enabled: boolean) => {
+    setState(prev => ({
+      ...prev,
+      isPlacementMode: enabled,
+    }));
+  }, []);
+
+  const activateDrawMode = useCallback(() => {
+    if (signatureApiRef.current) {
+      signatureApiRef.current.activateDrawMode();
+      setPlacementMode(true);
+      // Mark signatures as not applied when entering draw mode
+      setState(prev => ({ ...prev, signaturesApplied: false }));
+    }
+  }, [setPlacementMode]);
+
+  const deactivateDrawMode = useCallback(() => {
+    if (signatureApiRef.current) {
+      signatureApiRef.current.deactivateTools();
+      setPlacementMode(false);
+    }
+  }, [setPlacementMode]);
+
+  const activateSignaturePlacementMode = useCallback(() => {
+    if (signatureApiRef.current) {
+      signatureApiRef.current.activateSignaturePlacementMode();
+      setPlacementMode(true);
+      // Mark signatures as not applied when placing new signatures
+      setState(prev => ({ ...prev, signaturesApplied: false }));
+    }
+  }, [setPlacementMode]);
+
+  const activateDeleteMode = useCallback(() => {
+    if (signatureApiRef.current) {
+      signatureApiRef.current.activateDeleteMode();
+      setPlacementMode(true);
+    }
+  }, [setPlacementMode]);
+
+  const updateDrawSettings = useCallback((color: string, size: number) => {
+    if (signatureApiRef.current) {
+      signatureApiRef.current.updateDrawSettings(color, size);
+    }
+  }, []);
+
+  const undo = useCallback(() => {
+    if (historyApiRef.current) {
+      historyApiRef.current.undo();
+    }
+  }, []);
+
+  const redo = useCallback(() => {
+    if (historyApiRef.current) {
+      historyApiRef.current.redo();
+    }
+  }, []);
+
+  const storeImageData = useCallback((id: string, data: string) => {
+    imageDataStore.current.set(id, data);
+  }, []);
+
+  const getImageData = useCallback((id: string) => {
+    return imageDataStore.current.get(id);
+  }, []);
+
+  const setSignaturesApplied = useCallback((applied: boolean) => {
+    setState(prev => ({
+      ...prev,
+      signaturesApplied: applied,
+    }));
+  }, []);
+
+  // No auto-activation - all modes use manual buttons
+
+  const contextValue: SignatureContextValue = {
+    ...state,
+    signatureApiRef,
+    historyApiRef,
+    setSignatureConfig,
+    setPlacementMode,
+    activateDrawMode,
+    deactivateDrawMode,
+    activateSignaturePlacementMode,
+    activateDeleteMode,
+    updateDrawSettings,
+    undo,
+    redo,
+    storeImageData,
+    getImageData,
+    setSignaturesApplied,
+  };
+
+  return (
+    <SignatureContext.Provider value={contextValue}>
+      {children}
+    </SignatureContext.Provider>
+  );
+};
+
+// Hook to use signature context
+export const useSignature = (): SignatureContextValue => {
+  const context = useContext(SignatureContext);
+  if (context === undefined) {
+    throw new Error('useSignature must be used within a SignatureProvider');
+  }
+  return context;
+};
+
+// Hook for components that need to check if signature mode is active
+export const useSignatureMode = () => {
+  const context = useContext(SignatureContext);
+  return {
+    isSignatureModeActive: context?.isPlacementMode || false,
+    hasSignatureConfig: context?.signatureConfig !== null,
+  };
+};

frontend/src/contexts/ViewerContext.tsx

@@ -1,5 +1,6 @@
 import React, { createContext, useContext, useState, ReactNode, useRef } from 'react';
 import { SpreadMode } from '@embedpdf/plugin-spread/react';
+import { useNavigation } from './NavigationContext';
 
 // Bridge API interfaces - these match what the bridges provide
 interface ScrollAPIWrapper {
@@ -208,6 +209,9 @@ export const ViewerProvider: React.FC<ViewerProviderProps> = ({ children }) => {
   // UI state - only state directly managed by this context
   const [isThumbnailSidebarVisible, setIsThumbnailSidebarVisible] = useState(false);
 
+  // Get current navigation state to check if we're in sign mode
+  useNavigation();
+
   // Bridge registry - bridges register their state and APIs here
   const bridgeRefs = useRef({
     scroll: null as BridgeRef<ScrollState, ScrollAPIWrapper> | null,

frontend/src/data/useTranslatedToolRegistry.tsx

@@ -32,6 +32,7 @@ import Flatten from "../tools/Flatten";
 import Rotate from "../tools/Rotate";
 import ChangeMetadata from "../tools/ChangeMetadata";
 import Crop from "../tools/Crop";
+import Sign from "../tools/Sign";
 import { compressOperationConfig } from "../hooks/tools/compress/useCompressOperation";
 import { splitOperationConfig } from "../hooks/tools/split/useSplitOperation";
 import { addPasswordOperationConfig } from "../hooks/tools/addPassword/useAddPasswordOperation";
@@ -55,6 +56,7 @@ import { flattenOperationConfig } from "../hooks/tools/flatten/useFlattenOperati
 import { redactOperationConfig } from "../hooks/tools/redact/useRedactOperation";
 import { rotateOperationConfig } from "../hooks/tools/rotate/useRotateOperation";
 import { changeMetadataOperationConfig } from "../hooks/tools/changeMetadata/useChangeMetadataOperation";
+import { signOperationConfig } from "../hooks/tools/sign/useSignOperation";
 import { cropOperationConfig } from "../hooks/tools/crop/useCropOperation";
 import { removeAnnotationsOperationConfig } from "../hooks/tools/removeAnnotations/useRemoveAnnotationsOperation";
 import { extractImagesOperationConfig } from "../hooks/tools/extractImages/useExtractImagesOperation";
@@ -86,6 +88,7 @@ import { scannerImageSplitOperationConfig } from "../hooks/tools/scannerImageSpl
 import AdjustPageScaleSettings from "../components/tools/adjustPageScale/AdjustPageScaleSettings";
 import ScannerImageSplitSettings from "../components/tools/scannerImageSplit/ScannerImageSplitSettings";
 import ChangeMetadataSingleStep from "../components/tools/changeMetadata/ChangeMetadataSingleStep";
+import SignSettings from "../components/tools/sign/SignSettings";
 import CropSettings from "../components/tools/crop/CropSettings";
 import RemoveAnnotations from "../tools/RemoveAnnotations";
 import RemoveAnnotationsSettings from "../components/tools/removeAnnotations/RemoveAnnotationsSettings";
@@ -225,10 +228,12 @@ export function useFlatToolRegistry(): ToolRegistry {
       sign: {
         icon: <LocalIcon icon="signature-rounded" width="1.5rem" height="1.5rem" />,
         name: t("home.sign.title", "Sign"),
-        component: null,
+        component: Sign,
         description: t("home.sign.desc", "Adds signature to PDF by drawing, text or image"),
         categoryId: ToolCategoryId.STANDARD_TOOLS,
         subcategoryId: SubcategoryId.SIGNING,
+        operationConfig: signOperationConfig,
+        settingsComponent: SignSettings,
         synonyms: getSynonyms(t, "sign")
       },
 

frontend/src/global.d.ts

@@ -18,6 +18,5 @@ declare module '../assets/material-symbols-icons.json' {
 }
 
 declare module 'pdfjs-dist/legacy/build/pdf.mjs'
-// TODO: Add proper EmbedPDF types for local submodule integration
 
 export {};

frontend/src/hooks/tools/sign/useSignOperation.ts

@@ -0,0 +1,59 @@
+import { useTranslation } from 'react-i18next';
+import { useToolOperation, ToolOperationHook, ToolType } from '../shared/useToolOperation';
+import { SignParameters, DEFAULT_PARAMETERS } from './useSignParameters';
+import { createStandardErrorHandler } from '../../../utils/toolErrorHandler';
+
+// Static configuration that can be used by both the hook and automation executor
+export const buildSignFormData = (params: SignParameters, file: File): FormData => {
+  const formData = new FormData();
+  formData.append('fileInput', file);
+
+  // Add signature data if available
+  if (params.signatureData) {
+    formData.append('signatureData', params.signatureData);
+  }
+
+  // Add signature position and size
+  if (params.signaturePosition) {
+    formData.append('x', params.signaturePosition.x.toString());
+    formData.append('y', params.signaturePosition.y.toString());
+    formData.append('width', params.signaturePosition.width.toString());
+    formData.append('height', params.signaturePosition.height.toString());
+    formData.append('page', params.signaturePosition.page.toString());
+  }
+
+  // Add signature type
+  formData.append('signatureType', params.signatureType || 'draw');
+
+  // Add other parameters
+  if (params.reason) {
+    formData.append('reason', params.reason);
+  }
+  if (params.location) {
+    formData.append('location', params.location);
+  }
+  if (params.signerName) {
+    formData.append('signerName', params.signerName);
+  }
+
+  return formData;
+};
+
+// Static configuration object
+export const signOperationConfig = {
+  toolType: ToolType.singleFile,
+  buildFormData: buildSignFormData,
+  operationType: 'sign',
+  endpoint: '/api/v1/security/add-signature',
+  filePrefix: 'signed_',
+  defaultParameters: DEFAULT_PARAMETERS,
+} as const;
+
+export const useSignOperation = (): ToolOperationHook<SignParameters> => {
+  const { t } = useTranslation();
+
+  return useToolOperation<SignParameters>({
+    ...signOperationConfig,
+    getErrorMessage: createStandardErrorHandler(t('sign.error.failed', 'An error occurred while signing the PDF.'))
+  });
+};

frontend/src/hooks/tools/sign/useSignParameters.ts

@@ -0,0 +1,61 @@
+import { useBaseParameters } from '../shared/useBaseParameters';
+
+export interface SignaturePosition {
+  x: number;
+  y: number;
+  width: number;
+  height: number;
+  page: number;
+}
+
+export interface SignParameters {
+  signatureType: 'image' | 'text' | 'draw' | 'canvas';
+  signatureData?: string; // Base64 encoded image or text content
+  signaturePosition?: SignaturePosition;
+  reason?: string;
+  location?: string;
+  signerName?: string;
+  fontFamily?: string;
+  fontSize?: number;
+}
+
+export const DEFAULT_PARAMETERS: SignParameters = {
+  signatureType: 'canvas',
+  reason: 'Document signing',
+  location: 'Digital',
+  signerName: '',
+  fontFamily: 'Helvetica',
+  fontSize: 16,
+};
+
+const validateSignParameters = (parameters: SignParameters): boolean => {
+  // Basic validation
+  if (!parameters.signatureType) return false;
+
+  // If signature position is set, validate it
+  if (parameters.signaturePosition) {
+    const pos = parameters.signaturePosition;
+    if (pos.x < 0 || pos.y < 0 || pos.width <= 0 || pos.height <= 0 || pos.page < 0) {
+      return false;
+    }
+  }
+
+  // For image and canvas signatures, require signature data
+  if ((parameters.signatureType === 'image' || parameters.signatureType === 'canvas') && !parameters.signatureData) {
+    return false;
+  }
+  // For text signatures, require signer name
+  if (parameters.signatureType === 'text' && !parameters.signerName) {
+    return false;
+  }
+
+  return true;
+};
+
+export const useSignParameters = () => {
+  return useBaseParameters<SignParameters>({
+    defaultParameters: DEFAULT_PARAMETERS,
+    endpointName: 'add-signature',
+    validateFn: validateSignParameters,
+  });
+};

frontend/src/tools/Sign.tsx

@@ -0,0 +1,176 @@
+import { useEffect, useCallback, useRef } from "react";
+import { useTranslation } from "react-i18next";
+import { createToolFlow } from "../components/tools/shared/createToolFlow";
+import { useSignParameters } from "../hooks/tools/sign/useSignParameters";
+import { useSignOperation } from "../hooks/tools/sign/useSignOperation";
+import { useBaseTool } from "../hooks/tools/shared/useBaseTool";
+import { BaseToolProps, ToolComponent } from "../types/tool";
+import SignSettings from "../components/tools/sign/SignSettings";
+import { useNavigation } from "../contexts/NavigationContext";
+import { useSignature } from "../contexts/SignatureContext";
+import { useFileContext } from "../contexts/FileContext";
+import { useViewer } from "../contexts/ViewerContext";
+import { flattenSignatures } from "../utils/signatureFlattening";
+
+const Sign = (props: BaseToolProps) => {
+  const { t } = useTranslation();
+  const { setWorkbench } = useNavigation();
+  const { setSignatureConfig, activateDrawMode, activateSignaturePlacementMode, deactivateDrawMode, updateDrawSettings, undo, redo, signatureApiRef, getImageData, setSignaturesApplied } = useSignature();
+  const { consumeFiles, selectors } = useFileContext();
+  const { exportActions, getScrollState } = useViewer();
+
+  // Track which signature mode was active for reactivation after save
+  const activeModeRef = useRef<'draw' | 'placement' | null>(null);
+
+  // Single handler that activates placement mode
+  const handleSignaturePlacement = useCallback(() => {
+    activateSignaturePlacementMode();
+  }, [activateSignaturePlacementMode]);
+
+  // Memoized callbacks for SignSettings to prevent infinite loops
+  const handleActivateDrawMode = useCallback(() => {
+    activeModeRef.current = 'draw';
+    activateDrawMode();
+  }, [activateDrawMode]);
+
+  const handleActivateSignaturePlacement = useCallback(() => {
+    activeModeRef.current = 'placement';
+    handleSignaturePlacement();
+  }, [handleSignaturePlacement]);
+
+  const base = useBaseTool(
+    'sign',
+    useSignParameters,
+    useSignOperation,
+    props
+  );
+
+  // Open viewer when files are selected
+  useEffect(() => {
+    if (base.selectedFiles.length > 0) {
+      setWorkbench('viewer');
+    }
+  }, [base.selectedFiles.length, setWorkbench]);
+
+
+  // Sync signature configuration with context
+  useEffect(() => {
+    setSignatureConfig(base.params.parameters);
+  }, [base.params.parameters, setSignatureConfig]);
+
+  // Save signed files to the system - apply signatures using EmbedPDF and replace original
+  const handleSaveToSystem = useCallback(async () => {
+    try {
+      // Get the original file
+      let originalFile = null;
+      if (base.selectedFiles.length > 0) {
+        originalFile = base.selectedFiles[0];
+      } else {
+        const allFileIds = selectors.getAllFileIds();
+        if (allFileIds.length > 0) {
+          const stirlingFile = selectors.getFile(allFileIds[0]);
+          if (stirlingFile) {
+            originalFile = stirlingFile;
+          }
+        }
+      }
+
+      if (!originalFile) {
+        console.error('No file available to replace');
+        return;
+      }
+
+      // Use the signature flattening utility
+      const success = await flattenSignatures({
+        signatureApiRef,
+        getImageData,
+        exportActions,
+        selectors,
+        consumeFiles,
+        originalFile,
+        getScrollState
+      });
+
+      if (success) {
+        console.log('✓ Signature flattening completed successfully');
+
+        // Mark signatures as applied
+        setSignaturesApplied(true);
+
+        // Force refresh the viewer to show the flattened PDF
+        setTimeout(() => {
+          // Navigate away from viewer and back to force reload
+          setWorkbench('fileEditor');
+          setTimeout(() => {
+            setWorkbench('viewer');
+
+            // Reactivate the signature mode that was active before save
+            if (activeModeRef.current === 'draw') {
+              activateDrawMode();
+            } else if (activeModeRef.current === 'placement') {
+              handleSignaturePlacement();
+            }
+          }, 100);
+        }, 200);
+      } else {
+        console.error('Signature flattening failed');
+      }
+    } catch (error) {
+      console.error('Error saving signed document:', error);
+    }
+  }, [exportActions, base.selectedFiles, selectors, consumeFiles, signatureApiRef, getImageData, setWorkbench, activateDrawMode]);
+
+  const getSteps = () => {
+    const steps = [];
+
+    // Step 1: Signature Configuration - Always visible
+    steps.push({
+      title: t('sign.steps.configure', 'Configure Signature'),
+      isCollapsed: false,
+      onCollapsedClick: undefined,
+      content: (
+        <SignSettings
+          parameters={base.params.parameters}
+          onParameterChange={base.params.updateParameter}
+          disabled={base.endpointLoading}
+          onActivateDrawMode={handleActivateDrawMode}
+          onActivateSignaturePlacement={handleActivateSignaturePlacement}
+          onDeactivateSignature={deactivateDrawMode}
+          onUpdateDrawSettings={updateDrawSettings}
+          onUndo={undo}
+          onRedo={redo}
+          onSave={handleSaveToSystem}
+        />
+      ),
+    });
+
+    return steps;
+  };
+
+  return createToolFlow({
+    files: {
+      selectedFiles: base.selectedFiles,
+      isCollapsed: base.operation.files.length > 0,
+    },
+    steps: getSteps(),
+    review: {
+      isVisible: false, // Hide review section - save moved to configure section
+      operation: base.operation,
+      title: t('sign.results.title', 'Signature Results'),
+      onFileClick: base.handleThumbnailClick,
+      onUndo: () => {},
+    },
+    forceStepNumbers: true,
+  });
+};
+
+// Add the required static methods for automation
+Sign.tool = () => useSignOperation;
+Sign.getDefaultParameters = () => ({
+  signatureType: 'canvas',
+  reason: 'Document signing',
+  location: 'Digital',
+  signerName: '',
+});
+
+export default Sign as ToolComponent;

frontend/src/utils/signatureFlattening.ts

@@ -0,0 +1,309 @@
+import { PDFDocument, rgb } from 'pdf-lib';
+import { generateThumbnailWithMetadata } from './thumbnailUtils';
+import { createProcessedFile } from '../contexts/file/fileActions';
+import { createNewStirlingFileStub, createStirlingFile, StirlingFile, FileId, StirlingFileStub } from '../types/fileContext';
+import type { SignatureAPI } from '../components/viewer/SignatureAPIBridge';
+
+interface MinimalFileContextSelectors {
+  getAllFileIds: () => FileId[];
+  getStirlingFileStub: (id: FileId) => StirlingFileStub | undefined;
+  getFile: (id: FileId) => StirlingFile | undefined;
+}
+
+interface SignatureFlatteningOptions {
+  signatureApiRef: React.RefObject<SignatureAPI | null>;
+  getImageData: (id: string) => string | undefined;
+  exportActions?: {
+    saveAsCopy: () => Promise<ArrayBuffer | null>;
+  };
+  selectors: MinimalFileContextSelectors;
+  consumeFiles: (inputFileIds: FileId[], outputStirlingFiles: StirlingFile[], outputStirlingFileStubs: StirlingFileStub[]) => Promise<FileId[]>;
+  originalFile?: StirlingFile;
+  getScrollState: () => { currentPage: number; totalPages: number };
+}
+
+export async function flattenSignatures(options: SignatureFlatteningOptions): Promise<boolean> {
+  const { signatureApiRef, getImageData, exportActions, selectors, consumeFiles, originalFile, getScrollState } = options;
+
+  try {
+    // Step 1: Extract all annotations from EmbedPDF before export
+    const allAnnotations: Array<{pageIndex: number, annotations: any[]}> = [];
+
+    if (signatureApiRef?.current) {
+
+      // Get actual page count from viewer
+      const scrollState = getScrollState();
+      const totalPages = scrollState.totalPages;
+
+      // Check only actual pages that exist in the document
+      for (let pageIndex = 0; pageIndex < totalPages; pageIndex++) {
+        try {
+          const pageAnnotations = await signatureApiRef.current.getPageAnnotations(pageIndex);
+          if (pageAnnotations && pageAnnotations.length > 0) {
+            // Filter to only include annotations added in this session
+            const sessionAnnotations = pageAnnotations.filter(annotation => {
+              // Check if this annotation has stored image data (indicates it was added this session)
+              const hasStoredImageData = annotation.id && getImageData(annotation.id);
+
+              // Also check if it has image data directly in the annotation (new signatures)
+              const hasDirectImageData = annotation.imageData || annotation.appearance ||
+                                       annotation.stampData || annotation.imageSrc ||
+                                       annotation.contents || annotation.data;
+
+              const isSessionAnnotation = hasStoredImageData || (hasDirectImageData && typeof hasDirectImageData === 'string' && hasDirectImageData.startsWith('data:image'));
+
+
+              return isSessionAnnotation;
+            });
+
+            if (sessionAnnotations.length > 0) {
+              allAnnotations.push({pageIndex, annotations: sessionAnnotations});
+            }
+          }
+        } catch (pageError) {
+          console.warn(`Error extracting annotations from page ${pageIndex + 1}:`, pageError);
+        }
+      }
+    }
+
+    console.log(`Total annotations found: ${allAnnotations.reduce((sum, page) => sum + page.annotations.length, 0)}`);
+
+    // Step 2: Delete ONLY session annotations from EmbedPDF before export (they'll be rendered manually)
+    // Leave old annotations alone - they will remain as annotations in the PDF
+    if (allAnnotations.length > 0 && signatureApiRef?.current) {
+      for (const pageData of allAnnotations) {
+        for (const annotation of pageData.annotations) {
+          try {
+            await signatureApiRef.current.deleteAnnotation(annotation.id, pageData.pageIndex);
+          } catch (deleteError) {
+            console.warn(`Failed to delete annotation ${annotation.id}:`, deleteError);
+          }
+        }
+      }
+    }
+
+    // Step 3: Use EmbedPDF's saveAsCopy to get the base PDF (now without annotations)
+    if (!exportActions) {
+      console.error('No export actions available');
+      return false;
+    }
+    const pdfArrayBuffer = await exportActions.saveAsCopy();
+
+    if (pdfArrayBuffer) {
+
+      // Try loading with more permissive PDF-lib options
+
+      // Convert ArrayBuffer to File
+      const blob = new Blob([pdfArrayBuffer], { type: 'application/pdf' });
+
+      // Get the current file - try from originalFile first, then from all files
+      let currentFile = originalFile;
+      if (!currentFile) {
+        const allFileIds = selectors.getAllFileIds();
+        if (allFileIds.length > 0) {
+          const fileStub = selectors.getStirlingFileStub(allFileIds[0]);
+          const fileObject = selectors.getFile(allFileIds[0]);
+          if (fileStub && fileObject) {
+            currentFile = createStirlingFile(fileObject, allFileIds[0] as FileId);
+          }
+        }
+      }
+
+      if (!currentFile) {
+        console.error('No file available to replace');
+        return false;
+      }
+
+      let signedFile = new File([blob], currentFile.name, { type: 'application/pdf' });
+
+      // Step 4: Manually render extracted annotations onto the PDF using PDF-lib
+      if (allAnnotations.length > 0) {
+        try {
+          console.log('Manually rendering annotations onto PDF...');
+          const pdfArrayBufferForFlattening = await signedFile.arrayBuffer();
+
+          // Try different loading options to handle problematic PDFs
+          let pdfDoc: PDFDocument;
+          try {
+            pdfDoc = await PDFDocument.load(pdfArrayBufferForFlattening, {
+              ignoreEncryption: true,
+              capNumbers: false,
+              throwOnInvalidObject: false
+            });
+          } catch {
+            console.warn('Failed to load with standard options, trying createProxy...');
+            try {
+              // Create a fresh PDF and copy pages instead of modifying
+              pdfDoc = await PDFDocument.create();
+              const sourcePdf = await PDFDocument.load(pdfArrayBufferForFlattening, {
+                ignoreEncryption: true,
+                throwOnInvalidObject: false
+              });
+              const pageIndices = sourcePdf.getPages().map((_, i) => i);
+              const copiedPages = await pdfDoc.copyPages(sourcePdf, pageIndices);
+              copiedPages.forEach(page => pdfDoc.addPage(page));
+            } catch (copyError) {
+              console.error('Failed to load PDF with any method:', copyError);
+              throw copyError;
+            }
+          }
+
+          const pages = pdfDoc.getPages();
+
+
+          for (const pageData of allAnnotations) {
+            const { pageIndex, annotations } = pageData;
+
+            if (pageIndex < pages.length) {
+              const page = pages[pageIndex];
+              const { height: pageHeight } = page.getSize();
+
+              for (const annotation of annotations) {
+                try {
+
+                  const rect = annotation.rect || annotation.bounds || annotation.rectangle || annotation.position;
+
+                  if (rect) {
+                    // Extract original annotation position and size
+                    const originalX = rect.origin?.x || rect.x || rect.left || 0;
+                    const originalY = rect.origin?.y || rect.y || rect.top || 0;
+                    const width = rect.size?.width || rect.width || 100;
+                    const height = rect.size?.height || rect.height || 50;
+
+                    // Convert EmbedPDF coordinates to PDF-lib coordinates
+                    const pdfX = originalX;
+                    const pdfY = pageHeight - originalY - height;
+
+
+                    // Try to get annotation image data
+                    let imageDataUrl = annotation.imageData || annotation.appearance || annotation.stampData ||
+                                     annotation.imageSrc || annotation.contents || annotation.data;
+
+                    // If no image data found directly, try to get it from storage
+                    if (!imageDataUrl && annotation.id) {
+                      const storedImageData = getImageData(annotation.id);
+                      if (storedImageData) {
+                        imageDataUrl = storedImageData;
+                      }
+                    }
+
+                    if (imageDataUrl && typeof imageDataUrl === 'string' && imageDataUrl.startsWith('data:image')) {
+                      try {
+                        // Convert data URL to bytes
+                        const base64Data = imageDataUrl.split(',')[1];
+                        const imageBytes = Uint8Array.from(atob(base64Data), c => c.charCodeAt(0));
+
+                        // Embed image in PDF based on data URL type
+                        let image;
+                        if (imageDataUrl.includes('data:image/jpeg') || imageDataUrl.includes('data:image/jpg')) {
+                          image = await pdfDoc.embedJpg(imageBytes);
+                        } else if (imageDataUrl.includes('data:image/png')) {
+                          image = await pdfDoc.embedPng(imageBytes);
+                        } else {
+                          image = await pdfDoc.embedPng(imageBytes);
+                        }
+
+                        // Draw image on page at annotation position
+                        page.drawImage(image, {
+                          x: pdfX,
+                          y: pdfY,
+                          width: width,
+                          height: height,
+                        });
+
+                      } catch (imageError) {
+                        console.error('Failed to render image annotation:', imageError);
+                      }
+                    } else if (annotation.content || annotation.text) {
+                      // Handle text annotations
+                      page.drawText(annotation.content || annotation.text, {
+                        x: pdfX,
+                        y: pdfY + height - 12, // Adjust for text baseline
+                        size: 12,
+                        color: rgb(0, 0, 0)
+                      });
+                    } else if (annotation.type === 14 || annotation.type === 15) {
+                      // Handle ink annotations (drawn signatures)
+                      page.drawRectangle({
+                        x: pdfX,
+                        y: pdfY,
+                        width: width,
+                        height: height,
+                        borderColor: rgb(0, 0, 0),
+                        borderWidth: 2,
+                        color: rgb(0.9, 0.9, 0.9), // Light gray background
+                        opacity: 0.8
+                      });
+
+                      page.drawText('Drawn Signature', {
+                        x: pdfX + 5,
+                        y: pdfY + height / 2,
+                        size: 10,
+                        color: rgb(0, 0, 0)
+                      });
+                    } else {
+                      // Handle other annotation types
+                      page.drawRectangle({
+                        x: pdfX,
+                        y: pdfY,
+                        width: width,
+                        height: height,
+                        borderColor: rgb(1, 0, 0),
+                        borderWidth: 2,
+                        color: rgb(1, 1, 0), // Yellow background
+                        opacity: 0.5
+                      });
+                    }
+                  }
+                } catch (annotationError) {
+                  console.warn('Failed to render annotation:', annotationError);
+                }
+              }
+            }
+          }
+
+
+          // Save the PDF with rendered annotations
+          const flattenedPdfBytes = await pdfDoc.save({ useObjectStreams: false, addDefaultPage: false });
+
+          const arrayBuffer = new ArrayBuffer(flattenedPdfBytes.length);
+          const uint8View = new Uint8Array(arrayBuffer);
+          uint8View.set(flattenedPdfBytes);
+          signedFile = new File([arrayBuffer], currentFile.name, { type: 'application/pdf' });
+
+        } catch (renderError) {
+          console.error('Failed to manually render annotations:', renderError);
+          console.warn('Signatures may only show as annotations');
+        }
+      }
+
+      // Generate thumbnail and metadata for the signed file
+      const thumbnailResult = await generateThumbnailWithMetadata(signedFile);
+      const processedFileMetadata = createProcessedFile(thumbnailResult.pageCount, thumbnailResult.thumbnail);
+
+      // Prepare input file data for replacement
+      const inputFileIds: FileId[] = [currentFile.fileId];
+
+      const record = selectors.getStirlingFileStub(currentFile.fileId);
+      if (!record) {
+        console.error('No file record found for:', currentFile.fileId);
+        return false;
+      }
+
+      // Create output stub and file
+      const outputStub = createNewStirlingFileStub(signedFile, undefined, thumbnailResult.thumbnail, processedFileMetadata);
+      const outputStirlingFile = createStirlingFile(signedFile, outputStub.id);
+
+      // Replace the original file with the signed version
+      await consumeFiles(inputFileIds, [outputStirlingFile], [outputStub]);
+
+      console.log('✓ Signature flattening completed successfully');
+      return true;
+    }
+
+    return false;
+  } catch (error) {
+    console.error('Error flattening signatures:', error);
+    return false;
+  }
+}