GroupDocs.Annotation Net API is a product that allows you to work with annotations in documents on different platforms and operating systems, such as Android, MacOS, Linux, Windows. GroupDocs.Annotation provides a library with simple API that gives many advantages: for example, if you need to keep the data confidential or choose how much power you need to work with the library, or partially change the work with annotations, the library is very lightweight and flexible.
GroupDocs.Annotation for Net API allows you to work with different types of annotations, which includes: Text, Polyline, Area, Underline, Point, Watermark, Arrow, Ellipse, Text Replacement, Distance, Text Field, Resource Redaction etc. And supports most popular documents formats such as: PDF, HTML, Microsoft Office Word, Excel spreadsheets, PowerPoint presentations, Visio, Outlook emails, images, metafiles, CAD drawing and various other formats. The API provides the ability to get thumbnails of document pages and supports importing and exporting annotation to and from PDF files.