We’re happy to announce the major release of GroupDocs.Viewer for .NET 25.9, available as of September 2025. This major release delivers two new features with public API changes, one enhancement and 4 fixed bug.

New features

  • [New feature] Introduce distinct font type for each formats family (VIEWERNET-5486)
  • [New feature] List substituted fonts when getting all fonts for the WordProcessing family formats (VIEWERNET-5484)

Both these features continue to improve the mechanism of extracting and listing used fonts of the loaded document. In short, with VIEWERNET-5484 the GroupDocs.Viewer is now possible to list and return the substitutuion fonts, which are not present in original document, but are used to replace those original fonts, which are missing and thus unavailable on a target machine (where the GroupDocs.Viewer is running). The VIEWERNET-5486 feature improves the public API — instead of a single UsedFontInfo type now there is a IFontInfo interfave and a plenty of its inheritors — one per each formats family. Visit the article “Getting all used fonts in the loaded document ” in public documentation for the further details.

Fixes and enhancements

  • [Enhancement] Embed fonts when converting Spreadsheet documents to embedded HTML. (VIEWERNET-5490)
  • [Fix] PDF attachment in base PDF in rendered to HTML format with issues. (VIEWERNET-5374)
  • [Fix] Gradient on background is not correct when rendering PDF to HTML. (VIEWERNET-5345)
  • [Fix] Failed to load specific PSD. (VIEWERNET-3780)
  • [Fix] [UI] Groupdocs Viewer 8.0.7 - Wrong page no displayed initially during server delays to return pages. (VIEWERNET-5485)

How to get the update

Learn more