Syncfusion Essential Studio PDF Viewer SDK

Enable PDF viewing, annotation, form filling, and signing across web, desktop, and mobile platforms.

Published by Syncfusion
Distributed by ComponentSource since 2002

Version: 2026 Volume 1 SP1 (33.2.5) NEW Updated: May 5, 2026

Screenshot of Syncfusion Essential Studio PDF Viewer SDK

Syncfusion Essential Studio PDF Viewer SDK Releases

Released: Sep 23, 2025

Updates in 2025 Volume 3 (31.1.21)

Fixes

  • Web PDF Viewer (JavaScript, Angular, React, Vue, ASP.NET Core & MVC)
    • Resolved an issue where the form fields were not visible when loading a PDF document with more than 200 pages.
    • Resolved an issue where line type annotations were not working properly during add, resize, and drag.
    • Resolved an issue where the form fields are not visible on the non-rendered pages after zoom.
  • WPF PDF Viewer
    • Fixed the issue NullReferenceException in thumbnail pane after clicking the Organize pane.

Released: Sep 17, 2025

Updates in 2025 Volume 3 (31.1.20)

Fixes

  • WPF PDF Viewer
    • Fixed an issue of the StampAnnotation.Clear method in PDFViewer, ensuring that custom image stamp details are now properly cleared.
    • Added localization support for the Font Properties dialog, enhancing internationalization and user experience.

Released: Sep 10, 2025

Updates in 2025 Volume 3 (31.1.18)

Features

  • Flutter PDF Viewer
    • Breaking changes - In the SfPdfViewer widget, the page number API is now updated when the page crosses the center of the viewport instead of the top of the viewport.

Fixes

  • PDF Library
    • .NET PDF Library
      • Fixed an issue where PDF redaction failed during multi-threaded execution due to a static collection in the Redaction extension.
      • Resolved an exception that occurred during the export of annotations with Color Space details.
      • Fixed an issue where the Find Text feature...
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Released: Sep 5, 2025

Updates in 2025 Volume 3 (31.1.17)

Features

  • New Smart PDF Viewer component for Blazor (Preview) - The smart PDF Viewer for Blazor is an advanced component in PDF Viewer SDK that integrates artificial intelligence to enhance document interaction. Its features include document summarization, smart redaction, and smart filling. It enables users to manage documents more efficiently and securely.
    • Document summarization - This feature provides a comprehensive overview of a PDF document, allowing users to quickly grasp its key points...
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