Document Annotation with cURL APIs

Digitally annotate 35+ file types including documents, slides, cells, images etc. Seamlessly integrate with your cURL applications.

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GroupDocs.Annotation for cURL

GroupDocs.Annotation Cloud for cURL


GroupDocs.Annotation Cloud REST API helps you develop cross-platform document annotator. Build tools for annotating all common business documents and image file formats. Apply sticky notes, watermark overlays, pointers, drop arrows, redactions, and other types of graphic as well as text markups. Retrieve document information, render annotated documents to supported formats. Our Annotation RESTful API also supports 3rd part cloud storage, such as Amazon S3, Windows Azure, Dropbox etc.

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Advanced Document Annotation REST API Features



Add/remove graphic annotations & text markups


Retrieve document information such as metadata


Fetch annotation data for supported file formats


Import/export annotation list of the document


Render annotated document to PDF


Save resultant annotated document to storage & fetch its link


Support for multiple file formats & Cross-platform compatibility


Apply text redaction to the slide's content


Apply annotations to Header/Footer area in Microsoft Word documents


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.

Extract Document Annotations - cURL

curl -X GET "" \
-H "accept: application/json" \
-H "authorization: Bearer xxxxxx"

Robust Set of Annotation Tools

GroupDocs.Annotation Cloud for cURL supports a robust set of annotation types, which can primarily be divided into two categories; graphical annotations and text-based annotations. Both of these categories have further sub-categories of annotations and markups that you can use in your document annotation solutions.

Text based annotations, include adding comments to various text selections, hiding text of choice by redaction, applying various text markups, e.g., underlines and strikethroughs, and adding sticky notes to rich text.

On the other hand, graphical annotations include, area annotations to highlight area with rectangle in order to add notes, area redaction to hide classified text or image, point annotations to pick a point and apply notes to it, Pointer/arrow annotations to drop arrow for pointing towards an object within document, polyline annotation to draw freehand shapes and lines, watermark annotations to apply text-based watermark overlays, and distance annotations.

Easy Integration

Using the document annotation functionality of GroupDocs.Annotation Cloud with cURL is quite easy. Create an account at GroupDocs.Cloud to get the App SID & App Key. No type of installation is required to be done at the server or client end.

Support and Learning Resources


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