Duplicate Pages in Blazor PDF Viewer

17 Jul 20262 minutes to read

Overview

This guide explains how to duplicate pages within the current PDF using the Organize Pages UI.

Outcome: Duplicated pages are inserted adjacent to the selection and included in exported PDFs.

Prerequisites

  • Blazor PDF Viewer (SfPdfViewer) installed
  • Organize Pages feature enabled

Steps

  1. Open the Organize Pages view

    • Click the Organize Pages button in the viewer toolbar to open it.

  2. Select pages to duplicate

    • Click a single thumbnail or use Shift+click/Ctrl+click to select multiple pages.

  3. Duplicate selected pages

    • Click the Duplicate Pages button in the Organize Pages toolbar; duplicated pages are inserted to the right of the selected thumbnails. When multiple thumbnails are selected, the Duplicate action duplicates every selected page in order.

    Duplicate pages in organize view

  4. Undo or redo changes

    • Use Undo (Ctrl+Z) or Redo to revert or reapply recent changes.

    Undo and redo Organize Pages toolbar

  5. Persist duplicated pages

    • Click Save or Save As to include duplicated pages in the saved/downloaded PDF.

Programmatic approach

You can also duplicate pages programmatically using the Blazor PDF Viewer’s DuplicatePagesAsync method:

@using Syncfusion.Blazor.Buttons

<SfButton OnClick="DuplicateMethod">Duplicate</SfButton>
<SfPdfViewer2 @ref=Viewer
			  DocumentPath="https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf"
              Height="100%"
              Width="100%">
</SfPdfViewer2>

@code {
    private SfPdfViewer2? Viewer;

    private async Task DuplicateMethod() {
        await Viewer?.DuplicatePagesAsync([1,2]);
    }
}

For more details, see Programmatic support for Organize Pages.

Enable or disable Duplicate Pages button

To enable or disable the Duplicate Pages button in the Organize Pages toolbar, update the toolbar settings. See Organize pages toolbar customization for the guidelines.

Troubleshooting

  • If duplicates are not created, verify that the changes are persisted by clicking Save.

See also