Free Online EPUB to FB2 Converter
Convert EPUB to FB2 online for free.
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Checking files and selected output formats.
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EPUB vs FB2: Side-by-side
Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.
| Property | EPUB | FB2 |
|---|---|---|
| Full name | Electronic Publication | FictionBook 2 |
| Year introduced | 2007 | 2004 |
| Developer / standard body | W3C (formerly IDPF) | FictionBook (open) |
| MIME type | application/epub+zip | application/x-fictionbook+xml |
| File extension | .epub | .fb2 |
| Compression | ZIP-compressed XHTML + CSS | XML (typically uncompressed) |
| Color / data depth | N/A | N/A |
| Max dimensions / size | Software-limited | Software-limited |
| Transparency | No | No |
| Animation | No | No |
| Standard / specification | W3C EPUB 3.3 / ISO/IEC 23736 | FictionBook (open) |
| Best for | Apple Books, Kobo, Nook, Google Play Books — reflowable text | Russian-speaking ebook community, lightweight ebook archiving |
About the EPUB Format
EPUB (Electronic Publication) is the most widely adopted open ebook standard, maintained by the W3C (formerly IDPF) and published as ISO/IEC 23736. First released in 2007 as the successor to the Open eBook format, EPUB uses XHTML for content, CSS for styling, and ZIP compression for packaging. Its defining feature is reflowable text — content automatically adapts to fit any screen size, allowing readers to adjust font size, margins, and line spacing on phones, tablets, and dedicated eReaders.
EPUB is natively supported by Apple Books, Kobo, Nook, Google Play Books, and nearly every eReader and reading app outside the Kindle ecosystem. EPUB 3, the current version, adds support for embedded fonts, SVG graphics, MathML equations, JavaScript interactivity, audio/video embedding, and comprehensive accessibility features including text-to-speech and screen reader support. While Kindle devices do not read EPUB natively, the format can be converted to MOBI or AZW3 for Kindle compatibility.
EPUB to FB2 FAQ
Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert EPUB files to FB2.
Can I convert EPUB books to FB2 for my Kindle or Kobo?
How to convert EPUB to FB2 without losing the table of contents
Can I convert multiple EPUB ebooks to FB2 at once?
Does the text still reflow after converting to FB2?
Which reader is FB2 for?
Is there a file size limit for EPUB to FB2 conversion?
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