Convert EPUB to MOBI.
Convert EPUB to MOBI for older Kindle devices. Chapters, formatting and metadata preserved by Calibre.
How it works
- 01
Upload your EPUB
Drop a file or pick one from your device. Private by default.
- 02
Convert with Calibre
EPUB becomes MOBI using Calibre, the best-in-class open-source ebook engine — no paid API in the loop.
- 03
Download or hand off
Grab your MOBI, or open it in TranscriptAI to do more.
Chapters, formatting & metadata preserved
Private uploads, auto-deleted after 1 hour
No watermark, no signup to try
Handles large books
Free and open-source engine (Calibre)
Direct handoff to TranscriptAI
Your file is ready. Want to do more with it?
Open this file in TranscriptAI to generate a transcript, summary, structured notes, flashcards, quiz questions or action items — automatically.
Common questions
Is it free?+
Yes — convert EPUB to MOBI free. Paid plans add larger files, batch and priority.
Is my book private?+
Uploads go to a private bucket, are converted, and auto-delete after 1 hour. Files never touch a third-party converter.
Will formatting hold up?+
We use Calibre, the standard open-source ebook toolkit. Chapters, text flow and metadata are preserved.
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