We’re happy to announce the GroupDocs.Viewer for .NET 25.11 release, available as of November 2025. This major update introduces a new rendering option for PowerPoint presentations and resolves a large number of bugs across all supported formats.

What’s new in this release

  • [New feature] *Add option to render placeholders in headers and footers of slide * (VIEWERNET‑5551)
    The GroupDocs.Viewer now has an option to include the placeholder text defined in header and footer of a slide when rendering an input Presentation document to any output format. The feature is exposed through a new Boolean property RenderHeaderFooterPlaceholders, defined in the PresentationOptions class:

    // Enable exposing of header/footer placeholders when rendering to PDF
PdfViewOptions options = new PdfViewOptions();
options.PresentationOptions.RenderHeaderFooterPlaceholders = true;
using (Viewer viewer = new Viewer("sample.pptx))
{
    viewer.View(options);
}

This change does not affect existing rendering behaviour when the property is left at its default value (false).

Fixes and enhancements

The following issues have been resolved. All bug IDs reference the internal tracker (e.g., VIEWERNET-xxxx).

Category Issue Summary
Bug VIEWERNET-5550 Content added to PowerPoint footers was invisible when rendering to any format.
Bug VIEWERNET-5530 Arabic fonts were rendered incorrectly when converting DOCX to PDF.
Bug VIEWERNET-5408 PDF‑to‑HTML conversion suffered from slow rendering speed.
Bug VIEWERNET-4964 Custom DefaultFontName caused malformed text in PDF-to-HTML output.
Bug VIEWERNET-4941 Intermittent character rendering errors on Windows Server 2019.
Bug VIEWERNET-5024 Text was not converted correctly during PDF‑to‑HTML conversion.
Bug VIEWERNET-5514 Explicit page numbering for Spreadsheet formats was processed incorrectly on consecutive calls.
Bug VIEWERNET-5513 In trial mode, WordProcessing documents generated with an out-of-range page number caused failures.
Bug VIEWERNET-5480 PDF rendering could break completely under certain conditions.
Bug VIEWERNET-5515 TIFF rendering threw exceptions on Linux when using the cross-platform viewer.
Bug VIEWERNET-4540 PDF files displayed with swapped letters and shifted lines.
Bug VIEWERNET-5516 Licensed mode WordProcessing-to-PDF conversion failed when the requested page number exceeded the document’s page count.

No additional enhancements were introduced in this version.

How to get the update

  • NuGet – Upgrade to the latest package via NuGet. Use the appropriate feed for your target platform:

    • Cross-platform .NET 6 – GroupDocs.Viewer.CrossPlatform

      dotnet add package GroupDocs.Viewer.CrossPlatform --version 25.11

    • Windows-only .NET Framework 4.6.2 / .NET 6 – GroupDocs.Viewer

      Install-Package GroupDocs.Viewer -Version 25.11

  • Direct download – Assemblies for both .NET and .NET Framework can be downloaded from the GroupDocs.Viewer for .NET 25.11 release page.

Resources

Stay tuned for future updates, and thank you for using GroupDocs.Viewer!