As of early 2025, Amazon no longer accepts MOBI for new ebook submissions on Kindle Direct Publishing (KDP), preferring EPUB or KPF instead. 2. How to Create or Convert MOBI Files

MOBI (short for Mobipocket) is a reflowable ebook format. Unlike PDFs, which have a fixed layout, MOBI text adjusts automatically to fit the screen size and orientation of your device.

You can use Amazon’s Send to Kindle service to wirelessly deliver MOBI files from your computer to your Kindle account. 4. Opening MOBI Files on Other Devices