GroupDocs.Annotation for .NET library is a web-based framework which provides features for annotating different types of documents in a web-browser without having to install plugins or middleware on the client. With GroupDocs.Annotation, end users can view and annotate PDF, Microsoft Word, Excel, Outlook, PowerPoint, OpenOffice, AutoCAD and other types of documents and image files. The library comes with a set of commenting and markup tools, including: rectangles, polylines, watermarks, point and area Notes, text markup and strikeouts....watermarks, point and area notes, text markup and strikeouts...