.NET API for Document Annotation

Nuget

It's an on-premise API that seamlessly integrates document annotation features into your .NET applications. Apply graphic, text, and watermark annotations.

Document Annotation via .NET

Import document annotations.
Add, remove, or reply to annotation comments.
Render document pages as images.
Generate document thumbnails or document image preview.
Support for default cache (local disk) or custom cache (Amazon S3, Dropbox, etc.).
Get list of supported file formats.
Fetch document information, such as page count & file size.
Extract annotations from a document and serialize to XML format.
Remove previously added annotations from a document.
Update specific annotation properties (size, color, etc.).

Supported Annotation Objects

Graphic Annotation: Area, Arrow, Distance, Point, Polyline, Redaction, TextField, Ellipse Text Annotation: Highlight, Replacement, Strikeout, Underline Watermark: Horizontal, Diagonal

Support Microsoft Office Formats for Annotation

Microsoft Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX, RTF
Microsoft Excel: XLS, XLSB, XLSM, XLSX
Microsoft PowerPoint: PPT, PPTX, PPSX, PPS
Microsoft Visio: VSD, VSDX, VSS, VST

Supported Platforms

GroupDocs.Annotation for .NET supported platforms are listed below:
.NET Standard 2.0: Any type of .NET Standard 2.0 application is supported (since Q4 2019).
.NET Framework: Any type of .NET Framework version 2.0 (or later) application is supported - ASP.NET, Web Services, WinForms, WPF, and others. Full support for 32-bit and 64-bit.
Windows Azure: GroupDocs.Annotation for .NET runs on Windows Azure.
Mono: You can use GroupDocs.Annotation for .NET to build applications with Mono.

Get Started

Are you ready to give GroupDocs.Annotation for .NET a try? Simply execute Install-Package GroupDocs.Annotation from Package Manager Console in Visual Studio to fetch & reference GroupDocs.Annotation assembly in your project. If you already have GroupDocs.Annotation for .Net and want to upgrade it, please execute Update-Package GroupDocs.Annotation to get the latest version.

Please check the GitHub Repository for other common usage scenarios.

Use C# Code to Extract Annotations from `PDF` File

// for using this example input file ("annotated.pdf") must be with annotations
using(Annotator annotator = new Annotator("annotated.pdf")) {
   List < AnnotationBase > annotations = annotator.Get();
   XmlSerializer formatter = new XmlSerializer(typeof (List < AnnotationBase > ));
   using(FileStream fs = new FileStream("annotations.xml", FileMode.Create)) {
      fs.SetLength(0);
      formatter.Serialize(fs, annotations);
   }
}

GroupDocs.Annotation for .NET

GroupDocs