PDF to MOBI? You probably want EPUB
Amazon retired MOBI in 2022 — EPUB is what Kindle accepts now. Convert your PDF to a clean EPUB that works on every modern Kindle.
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What happened to MOBI
MOBI is the ebook format Amazon inherited when it bought Mobipocket in 2005. It served the first Kindles well, but it’s a 20-year-old container with poor support for modern typography and layout — and Amazon itself has moved on:
- August 2022: Send to Kindle stopped accepting MOBI files — and started accepting EPUB.
- KDP, Amazon’s publishing arm, no longer takes MOBI for reflowable book submissions either.
- Every current Kindle device and app receives personal documents as EPUB via Send to Kindle.
Most sites offering “PDF to MOBI” conversion simply haven’t updated their pages since. Converting a PDF to MOBI in 2026 usually produces a file the official delivery pipeline will refuse.
Do you still need MOBI? A 60-second answer
| Your situation | Devices | The right format |
|---|---|---|
| Kindle bought in the last ~10 years, using Send to Kindle | Any model from 2013 on | EPUB — convert above, send via amazon.com/sendtokindle |
| Very old Kindle (pre-2012) loaded over USB cable | Kindle Keyboard, DX, early basics | MOBI still works on-device — use Calibre for this legacy path |
| Kobo, Boox, PocketBook, or any reading app | Everything that isn't a Kindle | EPUB — it's the native format everywhere |
Honest note: for the genuine legacy case — sideloading onto a pre-2012 Kindle over USB — free Calibre can produce a MOBI, and we’d point you there rather than pretend EPUB fits a device that can’t read it. For every other Kindle, EPUB through Send to Kindle gives you better typography, working chapters and library sync — the full workflow is on our PDF to Kindle page.
Why the EPUB you make here beats a MOBI from 2015-era tools
Old PDF-to-MOBI converters share the weakness of all mechanical converters: they dump text page by page, losing chapters, table of contents and footnotes, and they can’t read scanned pages at all. The AI pipeline here rebuilds the book’s actual structure — chapter detection, navigable TOC, cleaned footnotes, OCR for scans — and outputs a modern EPUB 3. When Send to Kindle converts that EPUB for your device, all of that structure survives.