Annotate Documents using Cloud SDK for .NET

Easily add Multi-format Document & Image Annotation Functionality to your own .NET Applications.

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GroupDocs.Annotation Cloud SDK for .NET

GroupDocs.Annotation Cloud SDK for .NET


GroupDocs.Annotation Cloud is a REST API and universal document annotator that supports almost all common business document and image file formats including PDF, Microsoft Word, Excel, PowerPoint, raster images and many more. In order to use the features of the API in an easy and efficient manner in your .NET application without going into the underlying details of handling the HTTP requests and responses, we have developed the SDK for .NET, which is not only easy to incorporate but can also be customized to suit your needs.

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Advanced Document Annotation REST API Features



Multiple file formats support


Render document pages to images


Convenient to use SDK


Easy integration with REST API


Export or import annotations


A robust set of annotation tools


Work with Document Annotations

GroupDocs.Annotation Cloud SDK for .NET allows you to utlize all the features of the GroupDocs.Annotation REST API which provides a number of ways to deal with the annotations. It not only allows retrieving annotations from documents but also adds (exports) annotation to a document and retrieves the resultant document as a stream. The below-mentioned example shows how easy is to importe annotation using the SDK for .NET:

Import document annotations - C#

//Get your AppSID and AppKey at (free registration is required).
var configuration = new Configuration {AppSid = Sid, AppKey = Key};
// Instantiate GroupDocs.Annotation API object
var apiInstance = new AnnotationApi(configuration);
var request = new GetImportRequest()
        Name = "Template.pdf",
        Folder = null,
        Password = null
// Import annotations from document
var response = apiInstance.GetImport(request);

Robust Set of Annotation Tools

Text annotations:

  • Text annotation – add comments to selected text.
  • Text replacement – highlight which text should be replaced with what.
  • Text redaction – hide confidential text.
  • Strikeout/underline – highlight text with strikethroughs/underlines.
  • Typewriter – add sticky notes with rich text.

Figure annotations:

  • Area annotation – add notes to an area highlighted with a rectangle.
  • Point annotation – add notes to any point in the document.
  • Area redaction – hide confidential parts of an image or text.
  • Polyline – draw freehand lines and shapes.
  • Pointer/arrow – drop arrows pointing to an object.
  • Watermark – create text-based watermark overlays.
  • Distance – measure the distance between any objects in a document.

Easy Integration

It is easy to integrate GroupDocs.Annotation Cloud into your apps, as there is nothing to install on the server or client-side. Simply create an account at GroupDocs Cloud and get your application information. Once you have the App SID & key, you are ready to give the GroupDocs.Annotation Cloud REST API a try, and can annotate a multitude of document formats with simple API calls.

Support and Learning Resources


GroupDocs.Annotation Cloud Product Family also includes SDKs for other popular languages as listed below: