Online e-book reader, creator and converter

Open and view e-books online, convert DOCX to EPUB and FB2

Read e-books conveniently

Open and view the uploaded EPUB, FB2, and PDF files online, locally, or on-the-go, no matter what device you are using. Easily navigate through headings, switch to dark theme in low-light environments, print e-books if necessary.

Create interactive e-books

Writing your own book? Make use of multiple styling and formatting tools. Insert a table of contents, refer to images, objects, and charts with a table of figures, explain certain points in footnotes or endnotes, add bookmarks and clickable links to useful resources.
Apply watermarks to protect intellectual property. Give your document a professional layout by setting mirror & gutter margins for pages that will be bound together.

Co-author effectively

While creating an e-book, collaborate on a text file with your team. Switch between real-time or paragraph-locking modes, leave comments, track changes, discuss the process in the built-in chat or Telegram. Make audio and video calls via Jitsi.

Export to EPUB, FB2, and PDF

When your work is ready, save the created DOCX file as EPUB or FB2. EPUB adapts to mobile devices, so that you can read comfortably without zooming in and out. FB2 is simple and won't take too much space on your e-book reader. Convert DOCX, EPUB or FB2 to PDF.

Do more with plugins

Insert bibliographies via Mendeley and Zotero choosing the required citation style. Get help of an AI writer tool to fix spelling and grammar, translate sentences, find synonyms, analyze words and phrases, shorten or simplify text, etc.

Explore useful plugins

Get started and choose where to work


Create rooms within your secure DocSpace, invite people, view, edit, and collaborate on all kinds of documents from any desktop or mobile device.

In the platform you use

Connect Docs to edit documents directly from your app. 40+ ready integrations: Box, Moodle, Nextcloud, Odoo, Wordpress, etc.

In the platform you build

Integrate Docs into your service to provide powerful document-editing and building capabilities to your customers under your brand.

From your PC

Edit docs offline with free office apps for Windows, Linux, and macOS

From your mobile devices

Work on documents on the go with free apps for iOS and Android devices

Learn more about ONLYOFFICE e-book reader and creator


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Frequently Asked Questions
  • Can I export documents to EPUB and FB2 without Internet connection?

    Yes, you can install and use free ONLYOFFICE Desktop Editors to convert text files to e-books offline.

  • Can I just convert DOCX to EPUB or FB2 without installing any apps?

    Yes, you are welcome to do so using a free online converter which doesn't require any installation or registration.

  • Can I integrate the e-book converter into my own web app or service?

    Yes, ONLYOFFICE provides conversion API to convert all kinds of office documents, including eBooks, within your app.