We’re happy to announce the GroupDocs.Viewer for .NET UI 8.1.2 release, available as of November 2025. This update focuses on stability and usability improvements for the web‑based viewer UI for ASP.NET Core.

What’s new in 8.1.2

# Change Details
1️⃣ Printing in image mode fixed The print dialog now works correctly when the viewer is configured to render pages as images (PNG/JPEG). Page numbers are updated and the Print button triggers the expected browser print flow.
2️⃣ Optional page‑scroll animation UI navigation can now skip the smooth scroll animation. Set EnableScrollAnimation to false in the UI configuration to jump instantly to the target page.
3️⃣ Thumbnail generation optimized for image mode When rendering to PNG/JPEG the actual page image is reused as a thumbnail, eliminating the extra thumbnail‑creation step and speeding up image‑only rendering.
4️⃣ Local fonts only The viewer no longer loads web fonts; it uses only the fonts installed on the host machine. This resolves the font‑fallback issue reported in #75.

Disable scroll animation (code example)

builder.Services.AddGroupDocsViewerUI(config =>
{
    // Turn off the animated page‑scroll effect
    config.EnableScrollAnimation = false;
});

When EnableScrollAnimation is set to false, page navigation switches instantly, as shown in the before/after animations on the release page.

Fixes and enhancements

  • Printing in image mode – Resolved two bugs reported on the Free Support Forum where the print dialog either did nothing or displayed stale page numbers.
  • Performance boost for image rendering – Skipping thumbnail generation reduces CPU and memory usage when exporting to PNG/JPEG.
  • Font handling – Switching to local fonts eliminates the missing‑font problem that could cause layout differences across machines.

How to Get the Update

If you already have the package installed, open your .csproj file and update the GroupDocs.Viewer.UI* package versions to 8.1.2.

If you want to install the package for the first time, check the README or browse the Examples for the most common use cases.

Resources

Thank you for using GroupDocs.Viewer for .NET UI! If you encounter any issues or have suggestions, please share your feedback on GitHub or in our Free Support Forum.