This .NET library easily integrates HTML5 document annotation into web, mobile, or desktop apps. It supports over 50 file types, including PDF and Microsoft Office, and features lightweight design for optimal performance. Users can effortlessly annotate their documents.

One of the key features of this library is its cross-platform compatibility. End users can view and annotate documents from any web-enabled device using any HTML5-compliant browser. Additionally, GroupDocs.Annotation for .NET renders documents as text files, allowing users to easily perform actions such as selecting/copying and strikethrough/underline right from within your app or website.
This library also offers a comprehensive set of annotation tools, including text annotation (with options for strike-through, underline, and commenting), text replacement (edit text within the document), text/area redaction (blackout text or areas), sticky notes with rich text, area annotation (comment on an area marked up with a rectangle), point annotation (add notes to any point in the document), polyline (draw freehand lines), watermarking, arrow (direct users' view to the pointed elements), ruler (measure distance between objects in the document), and undo/redo options.
The convenient web UI that comes with the library makes it easy for users to navigate and annotate large multi-page documents from a browser. The UI is fully customizable, allowing you to tailor it to your needs. Users can turn pages like slides, preview them with thumbnails, jump to a specified page or between annotations, print, and export annotated documents to PDF.
Finally, GroupDocs.Annotation for .NET supports native Word and PDF annotations. Annotations made using this library can be converted to/from native PDF or Word annotations for further offline/online editing. The best part? The library can be deployed with a single DLL and doesn't require any client installation. To test the library without evaluation restrictions, simply contact GroupDocs sales for a 30-day fully-functional trial.
Version 1.8.1: - Numerous optimizations and bug fixes