REST APIs to Annotate Documents on Any Platform

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GroupDocs.Annotation for cURL

GroupDocs.Annotation Cloud for cURL


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, TIFF, JPG and many more. API also works with all popular third-party cloud storage providers, including Amazon S3, Windows Azure, Box, Google Cloud and Dropbox. Using cURL to handle HTTP requests and responses to the API, you can utilize all the features of the API, irrespective of the language or platform your app is built on.

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Advanced Document Annotation REST API Features



Multiple file formats support


Cross-platform compatibility


Convenient API


Easy integration


Export or import annotations


Robust set of annotation tools


Work with Document Annotations

GroupDocs.Annotation Cloud for cURL provides a number of ways to deal with annotations. It not only allows retrieving annotations from documents, but also adds(exports) annotation to a document and retrieves the resultant document as stream.

Import Document Annotations - cURL

curl -v "" \
-X GET \
-H "Content-Type: application/json" \
-H "authorization: Bearer 0v7TK3UGYjVBEcEIS9aaO0dsXAlt-KriIDnJGkDIPktFmuu6xIuou2-eVUD4" 

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.

Language, Platform & Storage Independence

GroupDocs.Annotation Cloud can be used with any language or platform which supports HTTP requests and responses. It is completely independent of your operating system, database system or development language. Being a REST API, all responses delivered in JSON or XML format and uses HTTP response codes to indicate API errors.You can also use API with many third party storage providers including Amazon S3, Google Cloud, Google Drive and DropBox.

Support and Learning Resources


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