Select multi-page annotations in ASP.NET Core PDF Viewer

28 Feb 20261 minute to read

The Syncfusion^® ASP.NET Core PDF Viewer allows you to treat TextMarkup annotations that span multiple pages as a single, unified annotation entity. This feature simplifies the interaction, selection, and management of highlights or underlines that cross page boundaries.

Enable multi-page selection

Set the enableMultiPageAnnotation property to true to activate this behavior. When enabled, selecting any part of the multi-page annotation highlights the entire sequence across all pages. You can also export and import these unified annotations as a single record.

The following example demonstrates how to configure the enableMultiPageAnnotation property in both standalone and server-backed viewer setups.

Standalone

<div style="width:100%;height:600px">
    <ejs-pdfviewer id="pdfviewer"
                   documentPath="https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf"
                   enableMultiPageAnnotation=true>
    </ejs-pdfviewer>
</div>

Server-Backed

<div style="width:100%;height:600px">
    <ejs-pdfviewer id="pdfviewer"
                   serviceUrl='/Index'
                   documentPath="https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf"
                   enableMultiPageAnnotation=true>
    </ejs-pdfviewer>
</div>