diff --git a/app/core/src/main/java/stirling/software/SPDF/controller/api/misc/FlattenController.java b/app/core/src/main/java/stirling/software/SPDF/controller/api/misc/FlattenController.java
index a76a737b56..6a187936ce 100644
--- a/app/core/src/main/java/stirling/software/SPDF/controller/api/misc/FlattenController.java
+++ b/app/core/src/main/java/stirling/software/SPDF/controller/api/misc/FlattenController.java
@@ -67,19 +67,32 @@ public class FlattenController {
             PDFRenderer pdfRenderer = new PDFRenderer(document);
             PDDocument newDocument =
                     pdfDocumentFactory.createNewDocumentBasedOnOldDocument(document);
+
+            int defaultRenderDpi = 100; // Default fallback
+            ApplicationProperties properties =
+                    ApplicationContextProvider.getBean(ApplicationProperties.class);
+            Integer configuredMaxDpi = null;
+            if (properties != null && properties.getSystem() != null) {
+                configuredMaxDpi = properties.getSystem().getMaxDPI();
+            }
+
+            int maxDpi =
+                    (configuredMaxDpi != null && configuredMaxDpi > 0)
+                            ? configuredMaxDpi
+                            : defaultRenderDpi;
+
+            Integer requestedDpi = request.getRenderDpi();
+            int renderDpi = maxDpi;
+            if (requestedDpi != null) {
+                renderDpi = Math.min(requestedDpi, maxDpi);
+                renderDpi = Math.max(renderDpi, 72);
+            }
+
             int numPages = document.getNumberOfPages();
             for (int i = 0; i < numPages; i++) {
                 try {
                     BufferedImage image;
 
-                    // Use global maximum DPI setting, fallback to 300 if not set
-                    int renderDpi = 300; // Default fallback
-                    ApplicationProperties properties =
-                            ApplicationContextProvider.getBean(ApplicationProperties.class);
-                    if (properties != null && properties.getSystem() != null) {
-                        renderDpi = properties.getSystem().getMaxDPI();
-                    }
-
                     try {
                         image = pdfRenderer.renderImageWithDPI(i, renderDpi, ImageType.RGB);
                     } catch (OutOfMemoryError e) {
diff --git a/app/core/src/main/java/stirling/software/SPDF/model/api/misc/FlattenRequest.java b/app/core/src/main/java/stirling/software/SPDF/model/api/misc/FlattenRequest.java
index cf4e7c575f..b53653a36f 100644
--- a/app/core/src/main/java/stirling/software/SPDF/model/api/misc/FlattenRequest.java
+++ b/app/core/src/main/java/stirling/software/SPDF/model/api/misc/FlattenRequest.java
@@ -18,4 +18,10 @@ public class FlattenRequest extends PDFFile {
             requiredMode = Schema.RequiredMode.REQUIRED,
             defaultValue = "false")
     private Boolean flattenOnlyForms;
+
+    @Schema(
+            description = "Optional DPI for page rendering when flattening the full document.",
+            requiredMode = Schema.RequiredMode.NOT_REQUIRED,
+            minimum = "72")
+    private Integer renderDpi;
 }
diff --git a/app/core/src/main/resources/messages_en_GB.properties b/app/core/src/main/resources/messages_en_GB.properties
index 86f6e928ab..eb75856d3b 100644
--- a/app/core/src/main/resources/messages_en_GB.properties
+++ b/app/core/src/main/resources/messages_en_GB.properties
@@ -1259,6 +1259,8 @@ repair.submit=Repair
 flatten.title=Flatten
 flatten.header=Flatten PDF
 flatten.flattenOnlyForms=Flatten only forms
+flatten.renderDpi=Rendering DPI (optional, recommended 150 DPI):
+flatten.renderDpi.help=Leave blank to use the system default. Higher DPI sharpens output but increases processing time and file size.
 flatten.submit=Flatten
 
 
diff --git a/app/core/src/main/resources/templates/misc/flatten.html b/app/core/src/main/resources/templates/misc/flatten.html
index fca06e0931..3e31d1cbf9 100644
--- a/app/core/src/main/resources/templates/misc/flatten.html
+++ b/app/core/src/main/resources/templates/misc/flatten.html
@@ -24,7 +24,20 @@
                 <div class="form-check ms-3">
                   <input id="flattenOnlyForms" name="flattenOnlyForms" type="checkbox">
                   <label for="flattenOnlyForms" th:text="#{flatten.flattenOnlyForms}" ></label>
-                </div>         
+                </div>
+                <div class="form-group ms-3 mt-2">
+                  <label class="form-label" for="renderDpi" th:text="#{flatten.renderDpi}"></label>
+                  <input
+                    class="form-control"
+                    id="renderDpi"
+                    min="72"
+                    name="renderDpi"
+                    step="1"
+                    th:attr="aria-describedby=${'renderDpiHelp'}"
+                    type="number"
+                  >
+                  <small class="form-text text-muted" id="renderDpiHelp" th:text="#{flatten.renderDpi.help}"></small>
+                </div>
                 <br>
                 <button type="submit" id="submitBtn" class="btn btn-primary" th:text="#{flatten.submit}"></button>
               </form>