How to convert MOBI to FB2
- Add your .MOBI file - drop it in the box above or click to browse.
- Convert it to .FB2 in a few seconds.
- Download your new .FB2 file.
What to expect
- MOBI files bought from Amazon carry DRM and cannot be converted - only DRM-free files such as personal manuscripts or Project Gutenberg downloads will go through.
- Complex CSS, drop caps, and fixed-layout elements may not survive; plain prose fiction converts cleanly.
- Calibre outputs a plain
.fb2file; if your app requires.fb2.zip, zip the result manually.
Frequently asked questions
Can I convert a Kindle book bought from Amazon?
No. Amazon's DRM locks the file to your account and blocks third-party conversion - Calibre will report an error. Only DRM-free
.mobi files can be converted.Will the table of contents survive?
Usually yes for standard NCX-based TOCs; Calibre maps them to FB2 section tags. Complex or custom TOC structures may need a quick manual check afterwards.
Why does the FB2 look odd in my reader after conversion?
MOBI stores content as compressed HTML with CSS, while FB2 is structured XML with a different content model. Unusual fonts or heavy custom styles are the common culprits; most plain-text fiction converts without issues.
Is AZW the same as MOBI?
AZW is essentially MOBI with Amazon DRM added, so the same restriction applies - only DRM-free files can be converted.
Programs that convert MOBI: Hamster Free eBook Converter · Calibre · Calibre for Mac · Calibre for Linux
