Powerful document conversion

One API to convert all kinds of Office documents : texts, sheets, slides, forms, PDFs, eBooks and more
Get started

Why to use ONLYOFFICE Conversion API

Support for all popular formats

Create PDFs from your docs, sheets, or slides, turn textbook into eBooks, convert presentations to image files, and more. ONLYOFFICE supports more that 50 different document formats.

Professional technical assistance

The team of experts is here to help you at every step. Have a pre-sale question? Contact us at sales@onlyoffice.com or schedule a time to have our team call you. For any technical problem, message us at support@onlyoffice.com.

Advanced settings

Add conversion settings to define the delimiter characters when converting csv files, the default currency display mode when converting spreadsheets, or to set page size and margins of the output PDF file, and more. Check out the API documentation to learn about all available options.

High-quality conversion

ONLYOFFICE constantly improve the service to provide the best possible results for all conversion types. Use our online converter and try to convert your own document files.


The open source code of ONLYOFFICE is listed on GitHub to ensure transparency and reliability. JSON Web Token protects documents from unauthorized access. Read more about security measures.

ONLYOFFICE conversion service is a part of ONLYOFFICE Docs, the most complete online office suite

View, edit and collaborate on all kinds of Office documents.
Work online from any browser and OS
Download Docs
Edit docs offline with free office apps for Windows, Linux, and macOS
Download desktop apps
Use free office apps for Android and iOS
Download mobile apps