GroupDocs.Viewer Cloud is a REST API for rendering over 50 documents and image formats as HTML5 or Image formats for the whole document, page by page or custom range of pages.


Flexible rendering documents as HTML5 or Image including next supported file formats

  • Portable Document Format: PDF
  • Microsoft Word: DOC, DOCX, DOCM, DOT, DOTX, DOTM
  • Microsoft Excel: XLS, XLSX, XLSM, XLSB, XLTX, XLTM
  • Microsoft PowerPoint: PPT, PPTX, PPS, PPSX, PPSM, POTM, PPTM, POTX
  • Microsoft Project: MPP, MPT
  • Microsoft Outlook: MSG, EML, PST, OST
  • Microsoft OneNote: ONE
  • Apple Mail: EMLX
  • OpenDocument Formats: ODT, OTT, ODS, ODP, OTP, OTS, ODG
  • Rich Text Format: RTF
  • Plain Text File: TXT
  • Comma-Separated Values: CSV
  • Tab Separated values: TSV
  • HyperText Markup Language: HTML, MHT, MHTML
  • Extensible Markup Language: XML
  • XML Paper Specification: XPS
  • Image files: BMP, GIF, JPG, PNG, TIFF, multi-page TIFF, WebP, DjVu, SVG, DNG
  • Jpeg2000 (JP2, J2C, J2K, JPF, JPX, JPM)
  • Electronic publication: EPUB
  • Windows Icon: ICO
  • Mobipocket e-book format: MOBI
  • Digital Imaging and Communications in Medicine format: DICOM
  • Metafile: WMF, EMF
  • LaTeX: TEX
  • Computer Graphics Metafile: CGM
  • Printer Command Language Document: PCL
  • Rotating and reordering
  • Watermarking pages
  • Rendering documents as PDF
  • Rendering document attachments

Security and Authentication

The GroupDocs.Viewer Cloud API is secured and requires authentication. Developers can create an application with Client Id and Client Secret when they register. Authenticated requests require an OAuth 2.0 authorization header. You can see complete details here.


GroupDocs.Viewer 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.Viewer SDKs along with working examples, to get you started in no time.

API Explorer

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.

CloudAPIs. You can get information about all the resources in the API. It also provides testing and interactivity to our API endpoint documentation.