diff --git a/frontend/public/locales/en-GB/translation.json b/frontend/public/locales/en-GB/translation.json
index 5d70efc9c..1ee4aeac2 100644
--- a/frontend/public/locales/en-GB/translation.json
+++ b/frontend/public/locales/en-GB/translation.json
@@ -2996,7 +2996,8 @@
     "options": {
       "highContrast": "High contrast",
       "invertAll": "Invert all colours",
-      "custom": "Custom"
+      "custom": "Custom",
+      "cmyk": "Convert to CMYK"
     },
     "tooltip": {
       "header": {
@@ -3023,6 +3024,10 @@
         "text": "Define your own text and background colours using the colour pickers. Perfect for creating branded documents or specific accessibility requirements.",
         "bullet1": "Text colour - Choose the colour for text elements",
         "bullet2": "Background colour - Set the background colour for the document"
+      },
+      "cmyk": {
+        "title": "Convert to CMYK",
+        "text": "Convert the PDF from RGB colour space to CMYK colour space, optimized for professional printing. This process converts colours to the Cyan, Magenta, Yellow, Black model used by printers."
       }
     },
     "error": {
diff --git a/frontend/src/core/components/tools/replaceColor/ReplaceColorSettings.tsx b/frontend/src/core/components/tools/replaceColor/ReplaceColorSettings.tsx
index a49342cd5..d0cdca5ce 100644
--- a/frontend/src/core/components/tools/replaceColor/ReplaceColorSettings.tsx
+++ b/frontend/src/core/components/tools/replaceColor/ReplaceColorSettings.tsx
@@ -23,6 +23,10 @@ const ReplaceColorSettings = ({ parameters, onParameterChange, disabled = false
     {
       value: 'CUSTOM_COLOR',
       label: t('replaceColor.options.custom', 'Custom')
+    },
+    {
+      value: 'COLOR_SPACE_CONVERSION',
+      label: t('replaceColor.options.cmyk', 'Convert to CMYK')
     }
   ];
 
diff --git a/frontend/src/core/components/tooltips/useReplaceColorTips.ts b/frontend/src/core/components/tooltips/useReplaceColorTips.ts
index 3fa8f7234..a6c3808d1 100644
--- a/frontend/src/core/components/tooltips/useReplaceColorTips.ts
+++ b/frontend/src/core/components/tooltips/useReplaceColorTips.ts
@@ -34,7 +34,11 @@ export const useReplaceColorTips = (): TooltipContent => {
           t("replaceColor.tooltip.custom.bullet1", "Text colour - Choose the colour for text elements"),
           t("replaceColor.tooltip.custom.bullet2", "Background colour - Set the background colour for the document")
         ]
+      },
+      {
+        title: t("replaceColor.tooltip.cmyk.title", "Convert to CMYK"),
+        description: t("replaceColor.tooltip.cmyk.text", "Convert the PDF from RGB colour space to CMYK colour space, optimized for professional printing. This process converts colours to the Cyan, Magenta, Yellow, Black model used by printers.")
       }
     ]
   };
-};
\ No newline at end of file
+};
diff --git a/frontend/src/core/hooks/tools/replaceColor/useReplaceColorParameters.ts b/frontend/src/core/hooks/tools/replaceColor/useReplaceColorParameters.ts
index a91459715..a0a0099c4 100644
--- a/frontend/src/core/hooks/tools/replaceColor/useReplaceColorParameters.ts
+++ b/frontend/src/core/hooks/tools/replaceColor/useReplaceColorParameters.ts
@@ -2,7 +2,7 @@ import { BaseParameters } from '@app/types/parameters';
 import { useBaseParameters, BaseParametersHook } from '@app/hooks/tools/shared/useBaseParameters';
 
 export interface ReplaceColorParameters extends BaseParameters {
-  replaceAndInvertOption: 'HIGH_CONTRAST_COLOR' | 'CUSTOM_COLOR' | 'FULL_INVERSION';
+  replaceAndInvertOption: 'HIGH_CONTRAST_COLOR' | 'CUSTOM_COLOR' | 'FULL_INVERSION' | 'COLOR_SPACE_CONVERSION';
   highContrastColorCombination: 'WHITE_TEXT_ON_BLACK' | 'BLACK_TEXT_ON_WHITE' | 'YELLOW_TEXT_ON_BLACK' | 'GREEN_TEXT_ON_BLACK';
   textColor: string;
   backGroundColor: string;