eBook formats

What is the MOBI format?

MOBI — Mobipocket eBook

MOBI is the Mobipocket e-book format, the original Kindle format, still read by older Kindles and many reading apps.

RW converts both ways MOBI Converter

Convert MOBI to

Convert to MOBI

About the MOBI format

Mobipocket was bought by Amazon in 2005 and became the basis of the Kindle. Many e-book collections and older Kindle books are MOBI files.

Amazon no longer accepts MOBI through Send to Kindle, and Kobo, Apple Books and most apps prefer EPUB. Converting MOBI to EPUB or AZW3 keeps old books usable.

Programs that open MOBI

  • Kindle devices
  • Calibre
  • FBReader
  • KOReader

What MOBI is used for

  • Older Kindle books
  • E-book collections

Other eBook formats

All 17 eBook formats · all supported formats