"After implementing and using GroupDocs.Annotation for .NET in the project it looks to be working very well. I have tested with a lot of documents and so far so good. Everything I've thrown at it renders nicely and looks just as good as it would in a PDF viewer or MS Word."

Mats Oustad

Senior Consultant/Partner
at Novanet AS

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Document Annotation API for Your .NET (C#, VB.NET) Apps

GroupDocs.Annotation for .NET API allows developers to seamlessly enhance their .NET apps with capability to annotate text or images in a document. Annotation can be applied in form of comment, highlighted note, watermark, polyline and many more. Annotation appearance in the document is controlled by API properties.

GroupDocs.Annotation for .NET
Support for PDF, Office & Image Files

Support for PDF, Office & Image Files

API allows your app users to annotate PDF and Microsoft Word files only. Moreover images document formats are in process. Advance document management options enable users to store, share, print and export annotated documents easily.

Native Word & PDF Annotations

Native PDF Annotations

Comments and markup added to PDF files in GroupDocs.Annotation for .NET can be exported to PDF annotations in output files. Likewise, PDF documents can be imported with annotations in them.

Zero-Footprint Integration


GroupDocs.Annotation for .NET is a standalone API. When building ASP.NET apps, this document annotation API can be integrated against your UI with just a few lines of code described in examples. It can also be integrated with C#, VB.NET or mobile Apps.