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The GroupDocs.Annotation Cloud is a REST API and universal document annotator that supports almost all common business document and image file formats. It gives developers an API for creating advanced online document annotation tools. With GroupDocs.Annotation Cloud API developers can deliver advanced annotation features to their users quickly. It provides features for export/import annotations into/from files, additionally to possibility to save files in supported formats.

Note

GroupDocs.Annotation Cloud REST API supports following type of Annotations:

Area – add notes to an area highlighted with a rectangle.
Arrow – The annotation type that draws an arrow on the document page.
Distance – measure the distance between any objects in a document.
Ellipse – The annotation of elliptic form that marks parts of document content.
Link – The annotation type that represents a hyperlink to a remote resource.
Point – add notes to any point in the document.
Polyline – draw freehand lines and shapes.
ResourcesRedaction – The annotation type that hides textual content behind black rectangle.
TextField – The text field annotation type represents textual comment inside colored frame.
TextHighlight – The annotation type that highlights and comments selected text.
TextRedaction – The annotation type that fills part of selected text with black rectangle.
TextReplacement – The annotation type that replaces original text with other provided text fragment.
TextStrikeout – The annotation type that marks text fragment with a strike through styling.
TextUnderline – The annotation type that marks text with a underline styling.
Watermark – The annotation type that adds textual watermark over document page.
Image – The annotation type that adds image overlay over document page content.

Format	Description	Annotate
DOC	Microsoft Word 97-2003 Document
DOCM	Microsoft Word Macro-Enabled Document
DOCX	Microsoft Word Document
DOT	Microsoft Word 97-2003 Template
DOTM	Microsoft Word Macro-Enabled Template
DOTX	Microsoft Word Template
RTF	Rich Text Document
ODT	OpenDocument Text
XLS	Microsoft Excel 97-2003 Worksheet
XLSB	Microsoft Excel Binary Worksheet
XLSM	Microsoft Excel Macro-Enabled Worksheet
XLSX	Microsoft Excel Worksheet
ODS	OpenDocument Spreadsheet
PPT	Microsoft PowerPoint 97-2003 Presentation
PPTX	Microsoft PowerPoint Presentation
PPSX	Microsoft PowerPoint Slide Show
ODP	OpenDocument Presentation
PPS	Microsoft PowerPoint 97-2003 Slide Show
TIF, TIFF	Tagged Image File Format (TIFF)
JPG, JPEG	Joint Photographic Experts Group (JPEG)
PNG	Portable Network Graphics (PNG)
BMP	Bitmap Picture (BMP)
PDF	Adobe Portable Document Format (PDF)
HTML	HyperText Markup Language (HTML)
EML	E-mail Message
VSD	Microsoft Visio 2003-2010 Drawing
VSDX	Microsoft Visio Drawing
VSS	Microsoft Visio 2003-2010 Stencil
VST	Microsoft Visio 2013 Stencil
DWG	Autodesk Design Data Formats
DXF	Drawing Interchange Format
DCM	Digital Imaging and Communications in Medicine (DICOM)

The GroupDocs.Annotation Cloud API is secured and requires authentication. Developers can generate a new application with an unique Client Id and Client Secret combination after registering to our dashboard. Authenticated requests require a Bearer authorization header with a JWT Token obtained by using the previously specified Cliend Id + Client Secret credentials. You can check complete details about authenticating your calls to our API here.

GroupDocs.Annotation Cloud comes with SDKs for different platforms to use this REST API in your specific project effortlessly. Checkout our GitHub repository for a complete list of GroupDocs.Annotation SDKs along with working examples, to get you started in no time.

The easiest way to try out our API right away in your browser! With the GroupDocs.Cloud Web API Explorer.
This is a collection of Swagger documentation for the GroupDocs.Cloud APIs. You can get information about all the resources in the API. It also provides testing and interactivity to our API endpoint documentation.