MOBI to FB2 converter
Convert MOBI Kindle books to FB2 free online. Read Amazon ebooks on Russian e-readers and FBReader. Powered by Calibre, 500 MB limit, auto-deleted in 1 hour.
Drop a file to convert here
or click to browse
About FictionBook 2.0
Common Use Cases
- Reading Kindle books on PocketBook devices
- Russian e-reader and CoolReader import
- Cross-platform ebook library building
MOBI is Amazon legacy Kindle format. If you have DRM-free MOBI files and want to read them on Russian e-readers or in FBReader/CoolReader, converting to FB2 is the fastest path. FB2 is the preferred format for these platforms and often provides better reading experiences than trying to sideload MOBI.
MOBI is Amazon proprietary Kindle format with limited support outside the Kindle ecosystem, while FB2 is an open XML format that is the standard for Russian e-readers and reading apps.
Why Convert MOBI to FB2?
Escape the Kindle ecosystem
MOBI locks you into Kindle devices and apps. Converting to FB2 frees your books for any FB2-compatible reader.
Native support on Russian e-readers
PocketBook, ONYX, and many other non-Amazon e-readers handle FB2 as their primary format. MOBI support on these devices is often limited or absent.
Better CoolReader and FBReader experience
These popular reading apps were designed around FB2. Structure, navigation, and rendering are optimized for the format.
Single structured XML file
FB2 stores the entire book in one XML file with clear semantic structure. Easy to store, search, and process.
When to use each
Keep MOBI when...
- Reading on a Kindle device
- Kindle app is your primary reader
- Staying in the Amazon ecosystem
- Kindle-specific features matter
- The file will stay on Kindle hardware
Convert to FB2 when...
- Using PocketBook or ONYX e-readers
- FBReader or CoolReader is your app
- Russian ebook platforms and libraries
- You want an open, structured format
- Cross-platform portability
Common use cases
- Reading Kindle books on PocketBook devices
- Russian e-reader and CoolReader import
- Cross-platform ebook library building
How to use
- Upload your MOBI file. Drag and drop a MOBI file onto the upload area, or click to browse. We accept files up to 500 MB.
- Start the conversion. Click Convert File. Calibre parses the MOBI content and rebuilds it as structured FB2 XML.
- Download your FB2 file. Click the download link to save your FB2 ebook. Files are auto-deleted from our servers within 1 hour.
Frequently asked questions
- Is MOBI to FB2 conversion free?
- Yes. Free users get a daily allowance, registered accounts get higher limits, and Premium or Lifetime members get unlimited conversions.
- Can I convert DRM-protected MOBI files?
- No. Only DRM-free MOBI files can be converted. Amazon DRM-protected purchases will fail.
- Will chapter navigation work?
- Yes. Calibre preserves the table of contents and chapter structure in the FB2 output.
- What apps read FB2?
- CoolReader, FBReader, PocketBook, ONYX e-readers, and many other platforms in the Russian-speaking ebook ecosystem.
- Will images transfer?
- Yes. Images from the MOBI are embedded in the FB2 file.
- Is there a size limit?
- Yes, 500 MB per file.
- How long are files kept?
- All files are auto-deleted within 1 hour. We never share your data with third parties.