How to convert EPUB to MOBI
- Add your .EPUB file - drop it in the box above or click to browse.
- Convert it to .MOBI in a few seconds.
- Download your new .MOBI file.
What to expect
- For USB sideloading to modern Kindles (2012 or later), choose AZW3 output in Calibre instead of MOBI - it preserves formatting better.
- DRM-protected EPUBs bought from Kobo, Apple, or similar stores cannot be converted - only DRM-free files work.
- MOBI files are often larger than the source EPUB because the format bundles two internal content versions for backward compatibility.
Frequently asked questions
Do I still need to convert EPUB to MOBI for Kindle?
No - current Kindles and the Kindle app accept EPUB directly since late 2022. Only older Kindles with outdated firmware need MOBI or AZW3 sideloaded via USB.
What formatting changes during conversion?
Body text, chapter structure, and images transfer well. Complex CSS layouts, custom fonts, and some special characters may simplify or be lost.
Why does Calibre refuse to convert my EPUB?
The file likely contains DRM protection. Only DRM-free EPUBs can be converted - files purchased from most stores include DRM.
What is the difference between MOBI and AZW3?
Both are Amazon Kindle formats. AZW3 is newer with better formatting support - prefer it over MOBI when sideloading to any Kindle from 2012 onward.
Programs that convert EPUB: Calibre · Hamster Free eBook Converter · KindleGen · Calibre for Mac · Calibre for Linux
