The page describes document annotations of different types and how to add annotations to a document using GroupDocs.Annotation API....Watermark Product Solution GroupDocs...and images of various types - PDF, Microsoft Word and Open Document...
This API allows you to digitally annotate any type of file format using .NET and C# language on any platform....Watermark Product Family GroupDocs.Merger...Add Search Text Annotation to PDF using C# Add Image Annotation...