EPUB to FB2 Converter

Convert EPUB e-books into FictionBook 2.0 XML files for compatible readers and archival workflows.

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Switch: Convert FB2 to EPUB

Format Comparison & Technical Specifications

SpecificationEPUBFB2
MIME Typeapplication/epub+zipapplication/x-fb2+xml
Typepackaged ebookXML digital book
CompressionZIP (DEFLATE)lossless XML text (often ZIP-compressed as .fb2.zip)
Standard SpecificationW3C EPUB 3.3FictionBook 2.0 XML Schema
Magic Bytes Header50 4B 03 04 ... 6D 69 6D 65 74 79 70 65 (mimetype)3C 3F 78 6D 6C ... 3C 46 69 63 74 69 6F 6E 42 6F 6F 6B (FictionBook)

Format Overview & Applications

EPUB is a packaged, reflowable publication format built from XHTML, CSS, and a manifest. FictionBook 2.0 (FB2) stores the book as a single XML document with explicit metadata, sections, and paragraphs. Converting EPUB to FB2 extracts readable text and rebuilds it into the portable FictionBook structure.

Technical Specifications & Codec Breakdown

The converter reads the EPUB ZIP container, extracts its textual XHTML content, and serializes the recovered paragraphs into a FictionBook 2.0 XML document with title, author, language, and body sections.

OS & Browser Compatibility

FB2 files are supported by FBReader, CoolReader, AlReader, and many e-reader applications used for FictionBook libraries.

Useful info

Review the generated title and author metadata after conversion because EPUB books can store those values in several different package locations.

Format Comparison & Technical Specifications

A typical EPUB novel becomes a compact UTF-8 FB2 XML document that is easy to index, archive, and open in FictionBook-compatible readers.

Frequently Asked Questions

Will the EPUB cover image be preserved in FB2?

The current conversion preserves the readable book text and core metadata. Complex EPUB styling and unsupported embedded assets may not map exactly to FB2 XML.

Does EPUB to FB2 change the original EPUB file?

No. The EPUB is read locally in your browser and a separate FB2 XML file is generated for download.