How to convert MOBI to AZW3
- Add your .MOBI file - drop it in the box above or click to browse.
- Convert it to .AZW3 in a few seconds.
- Download your new .AZW3 file.
What to expect
- DRM blocks conversion: MOBI files purchased from the Kindle Store are account-locked and no tool can convert them - only DRM-free files work.
- Text, chapters, embedded images, and metadata carry over; some custom fonts or drop caps from the source MOBI may not survive.
- MOBI was retired by Amazon in 2022 - AZW3 is the current format for Kindle USB sideloading, so converting older files keeps them usable on modern devices.
Frequently asked questions
Can I convert a Kindle Store MOBI to AZW3?
No. Amazon-purchased MOBI files carry DRM that locks them to your account, and Calibre and every other converter will refuse them.
Will the AZW3 look better than the original MOBI on a Kindle?
Usually slightly - AZW3 supports richer CSS styling and Calibre applies a clean stylesheet, which helps most with structured non-fiction; a plain novel may look nearly identical.
My MOBI is from Project Gutenberg. Will it convert?
Yes. DRM-free files from Project Gutenberg, Smashwords, or your own library convert without issues.
Should I keep the original MOBI after converting?
Keep it as a backup - MOBI is still widely supported by older e-reader apps, while AZW3 is Kindle-specific.
Programs that convert MOBI: Hamster Free eBook Converter · Calibre · Calibre for Mac · Calibre for Linux
