EPUB to FB2 converter
Convert EPUB to FB2 free online. Get FictionBook format for Russian e-readers and CoolReader. Powered by Calibre, 500 MB limit, auto-deleted in 1 hour.
Drop a file to convert here
or click to browse
About FictionBook 2.0
Common Use Cases
- Russian and Eastern European e-readers
- CoolReader and FBReader apps
- Structured ebook archival
FB2 (FictionBook) is an XML-based ebook format popular in Russia and Eastern Europe. Many Russian e-readers, library software, and reading apps like CoolReader and FBReader handle FB2 natively and sometimes prefer it over EPUB. If your audience uses these tools, converting from EPUB to FB2 ensures the best reading experience.
EPUB is the global ebook standard with reflowable content in a ZIP container, while FB2 is an XML-based format that stores the entire book in a single structured XML file, popular in Russian-speaking countries.
Why Convert EPUB to FB2?
Russian e-reader compatibility
Many Russian-made e-readers like PocketBook and ONYX handle FB2 natively and sometimes display it better than EPUB. Converting gives readers the format their device was designed for.
CoolReader and FBReader optimized
These popular reading apps were built around FB2. While they support EPUB, FB2 files often render with better structure and metadata handling.
Structured XML format
FB2 stores books as structured XML with explicit semantic markup for titles, epigraphs, poems, and citations. This structure can be useful for text processing and indexing.
Single-file simplicity
Unlike EPUB (which is a ZIP archive containing multiple files), FB2 is a single XML file. This makes it easy to store, transmit, and process.
When to use each
Keep EPUB when...
- Reading on Kindle, Kobo, or Apple Books
- Global ebook distribution
- Complex layouts with embedded fonts
- Rich CSS styling matters
- Audiobook or multimedia ebook features
Convert to FB2 when...
- Using a Russian or PocketBook e-reader
- CoolReader or FBReader is the primary app
- Single-file storage is preferred
- Structured XML data is useful
- Russian library archives
Common use cases
- Russian and Eastern European e-readers
- CoolReader and FBReader apps
- Structured ebook archival
How to use
- Upload your EPUB file. Drag and drop an EPUB file onto the upload area, or click to browse. We accept files up to 500 MB.
- Start the conversion. Click Convert File. Calibre converts the EPUB content into structured FB2 XML with proper chapter and metadata mapping.
- Download your FB2 file. Click the download link to save your FB2 ebook. Files are auto-deleted from our servers within 1 hour.
Frequently asked questions
- Is EPUB to FB2 conversion free?
- Yes. Free users get a daily allowance, registered accounts get higher limits, and Premium or Lifetime members get unlimited conversions.
- What is FB2?
- FictionBook (FB2) is an XML-based ebook format popular in Russia and Eastern Europe. It stores structured book content in a single XML file.
- Will formatting be preserved?
- Basic formatting (bold, italic, headings, chapters) transfers cleanly. Complex CSS layouts and embedded fonts do not carry over to FB2.
- What apps read FB2?
- CoolReader, FBReader, PocketBook devices, ONYX e-readers, and many Russian ebook platforms support FB2 natively.
- Will images transfer?
- Yes. Images are embedded as base64 data within the FB2 XML file.
- Is there a size limit?
- Yes, 500 MB per file.
- How long are files kept?
- All files are auto-deleted within 1 hour. We never share your data with third parties.