Online Tool Store
FB2 to EPUB Converter
Convert an .fb2 e-book's title, author, and chapter text into a valid, downloadable EPUB file. Runs entirely in your browser — nothing is uploaded.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
How it works
- Choose an .fb2 file — FB2 is an XML-based e-book format.
- The title, author, and chapter text are extracted from the XML and converted into individual XHTML chapter files.
- Those files are packaged into a valid EPUB (a ZIP archive with a specific structure) and offered as a download.
FAQ
What gets carried over from the FB2 file?
Title, author, and the book's chapter text and headings. Embedded cover images and rich inline formatting (bold, italics, footnotes) are not currently preserved — only plain paragraph text.
Will the EPUB open in any e-reader?
Yes — the output follows the EPUB 2 structure (container.xml, an OPF manifest, and an NCX table of contents), which every major e-reader app supports.
Why does the ZIP have no compression?
The converter writes "stored" (uncompressed) ZIP entries, which keeps the implementation simple and dependency-free while remaining fully valid per the ZIP and EPUB specs — file sizes are just a bit larger than a compressed EPUB.
Is my book file uploaded anywhere?
No — parsing the FB2 XML and building the EPUB ZIP both happen entirely in your browser.
How we compare
| Feature | Online Tool Store | Calibre (desktop app) | Online conversion service |
|---|---|---|---|
| No install required | ✓ | ✗ | ✓ |
| File never leaves your device | ✓ | ✓ | ✗ |
| Preserves cover art and rich formatting | ✗ | ✓ | ✗ (varies) |
For a quick, private text-only conversion without installing desktop software, this gets an FB2 into a readable EPUB in one click — for full fidelity with covers and formatting, Calibre remains the more complete tool.