Released: Jun 15, 2026

Updates in V26.6

Features

• NuGet package has been split into per-target-framework runtime packages (adds .NET 6 and .NET 8).
• Upgraded the underlying document engines.
• Spreadsheet text-replacement font colour must now be set explicitly.

Fixes

• Fixed image annotations failing on presentations (PPTX).
• Fixed Visio (Diagram) area/redaction annotations rendering as empty outlines.
• Fixed ArgumentOutOfRangeException when removing annotations from Visio documents with hyperlinks.
• Fixed Diagram GetDocumentInfo returning no...

Released: Nov 7, 2025

Updates in V25.11

Features

• Improved product stability for document processing.
• Updated external third-party dependencies to latest versions.
• Upgraded product with the latest versions of internal libraries.

Released: Dec 27, 2024

Updates in V24.12

Features

• Updated dependencies to the latest versions.
• Implemented latest security update.

Fixes

• Removed internally used members and methods from public API.

Released: May 31, 2024

Updates in V24.5

Features

• Improved implementation of IEquatable for all annotation classes.

Fixes

• Obtaining PDF document info error on large (more than 15 pages) documents.
• Fix Spreadsheet size calculations when locating annotation on document page.
• Null reference exception on Words document with specific options.
• Dimensions (height and width) of the XLSX-file page looks incorrectly small.
• Error Unable to serialize metadata object on saving PDF documents with Form Fields elements.

Released: Apr 9, 2024

Updates in V24.4

Features

• Updated outdated libraries.

Fixes

• Error opening XLSX document.

Released: Dec 29, 2023

Updates in V23.12

Features

• Added background color support for ReplacementAnnotation.
• Dropped support of Microsoft .NET Framework 4.0 and replaced it with .NET Framework 4.6.2.

Released: Jun 30, 2023

Updates in V23.6

Features

• Improved stability and security.
• Improved code quality.
• Improved summary of public members (classes, properties, fields etc).

Released: Jun 1, 2023

Updates in V23.5

Features

• Removed BinaryFormatter usage for annotations serialization.

Released: Apr 11, 2023

Updates in V23.4

Features

• Added SkiaSharp.NativeAssets.Linux.NoDependencies as a package dependency. GroupDocs.Annotation now uses SkiaSharp library to process images on Linux because Microsoft .NET Core is a cross-platform framework and System.Drawing library which is used for processing images on Microsoft Windows is not.

Fixes

• Fixed setting watermark annotation angle issue for PDF.
• Fixed an issue with identifying document format on PDF.
• Fixed an issue with adding annotation to the PDF document in .NET...

Released: Jan 31, 2023

Updates in V23.1

Features

• Added the ability to set a FontSize property for ReplacementAnnotation.

Fixes

• Fixed the broken link at the end of SquigglyAnnotation page.