FBZ is a FictionBook (FB2) ebook gzipped or zipped to save space — same XML inside, smaller download. Some libraries and converters emit it by default.
Typical use: Convert FBZ ebooks like FB2 — the archive is unpacked automatically.
About the FBZ format
FBZ is FictionBook with its traveling clothes on: the FB2 XML zipped (or gzipped) so the same markup travels in a smaller file. FB2 itself is the Russian-market ebook standard — structured XML with explicit body/notes/cover sections rather than laid-out pages.
Conversion is unpack-then-parse: the zip is opened in the browser, the FB2 inside feeds the standard FictionBook pipeline, and chapters rebuild cleanly into EPUB, text or HTML.
Strengths
- ✓ Same structure as FB2, smaller payload
- ✓ Self-contained cover and notes
- ✓ Standard on Russian ebook platforms
Limitations
- ✗ Some tools refuse the double extension
- ✗ FB2 schema verbosity survives inside
- ✗ Rare outside regional ecosystems
- Structure
- Zip/gzip wrapper + FB2 XML
- Types / schema
- XML ebook in a container
- Compatibility
- Calibre, FBRead, Pandoc
- Best for
- Regional ebook exchange
Convert FBZ to…
8 direct directions, sorted A–Z; 🔥 marks popular targets.
Frequently asked questions
What is a FBZ file?
FBZ is a FictionBook (FB2) ebook gzipped or zipped to save space — same XML inside, smaller download. Some libraries and converters emit it by default.
How do I convert FBZ files online?
Pick a target format from the "Convert FBZ to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.
Is it safe to convert FBZ files here?
Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.
Which formats can FBZ convert to?
This page lists all 8 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.