FB2 (FictionBook 2) is an XML-based ebook format created in Russia that stores text with semantic markup — paragraphs, emphasis, sections, images, and comprehensive metadata — in a single XML file. FB2 is the dominant ebook format in Russia and Eastern Europe, supported by readers like FBReader, CoolReader, and Moon+ Reader, and distributed through Russian ebook stores like LitRes and Flibusta. EPUB (Electronic Publication) is the international open ebook standard supported by Apple Books, Kobo, Google Play Books, and virtually every reading platform worldwide.

FB2 is a regional format with limited support outside Russia and Eastern Europe. Apple Books, Kobo, Amazon Kindle, Barnes & Noble Nook, and most international e-readers do not support FB2 natively. Converting to EPUB enables reading on any non-Russian platform and opens distribution to international ebook retailers.

EPUB is also an ISO-recognized standard (ISO/IEC 23736) with guaranteed long-term readability. For libraries, archival institutions, and publishers seeking international distribution, EPUB provides the format stability and universal compatibility that FB2 cannot offer outside its regional ecosystem.

Calibre parses the FB2 XML structure, extracting semantic content elements: <body> sections, <section> chapter divisions, <p> paragraphs, <emphasis> inline formatting, <image> references (base64-encoded within the FB2), and <description> metadata (title, author, genre, annotation, language). The semantic FB2 elements map cleanly to EPUB's XHTML structure. Sections become chapters with proper heading hierarchy. Base64-encoded images are decoded and stored as separate files in the EPUB package. Metadata transfers to the EPUB OPF file. The output is a valid EPUB 3 package with navigation document and proper content structure.

Yes. FB2 and EPUB both support Unicode/UTF-8 encoding. Russian, Ukrainian, Bulgarian, and other Cyrillic scripts transfer without any character issues.

Yes. Base64-encoded images within the FB2 file are decoded and embedded as standard image files in the EPUB package.

Yes. FB2 <section> elements map to EPUB chapter files with proper heading hierarchy and table of contents navigation.

Modern Kindles (2022+) accept EPUB. For older Kindles, convert the EPUB to MOBI using our EPUB-to-MOBI converter.

Yes. The output is a valid EPUB 3 file. Add publisher metadata and validate with EPUB Check before submitting to retail platforms.

Device	FictionBook	EPUB
Windows PC	Partial	Partial
macOS	Partial	Partial
iPhone/iPad	Partial	Partial
Android	Partial	Partial
Linux	Partial	Partial
Web Browser	No	No

Funktion	FictionBook	EPUB
Fullstandigt namn	FictionBook	Electronic Publication
Filandelse	.fb2	.epub
Bast for	XML structured	Reflowable text

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