Free · Private · In your browser
MOBI to EPUB Converter
Turn old Kindle MOBI files into universal EPUBs, right in your browser. Nothing is uploaded, ever.
Files never uploaded Works offline Free, no signup No file size limits
How it works
- Drop your MOBI file into the box above.
- The conversion runs right here in your browser – no upload bar, because there is no upload.
- Your EPUB downloads automatically, ready for any reader.
Why “no upload” matters
Every conventional converter site works the same way: your file travels to their server, sits in their queue, gets converted on their hardware, and – you hope – gets deleted afterwards. You can’t verify any of it. The FBI has even warned about free converter sites that use that upload as a way to deliver malware or harvest the documents themselves. Your books are yours; a format change shouldn’t require handing them to a stranger.
ebook.tools removes the question entirely. The converter is delivered to your browser as code and runs on your machine; the file you drop is opened from memory, transformed, and saved back – the network isn’t involved at all. That isn’t a policy promise, it’s an architecture, and you can test it: load this page, switch off your wifi, and convert. It works exactly the same, because there was never anything to send.
What is a MOBI file, and why convert it?
MOBI is the ebook format Amazon inherited when it bought the French company Mobipocket in 2005, and it powered the first decade of Kindle. It is thoroughly retired: Amazon's Send to Kindle service stopped accepting MOBI files in late 2022, new Kindle features don't support it, and the format itself – built for 2000s-era PDAs – can't express modern typography, embedded fonts or proper CSS layout.
EPUB is the universal replacement. It's an open standard supported by every current reading app and device: Kobo, Apple Books, Google Play Books, Boox, PocketBook – and yes, today's Kindles accept EPUB through Send to Kindle. If you have a folder of old MOBI files, converting them to EPUB is how you keep that library alive.
During conversion, ebook.tools unpacks the MOBI container, extracts the book's text, images, chapter structure and metadata (title, author, series), and rebuilds them as a clean EPUB 3 with a proper table of contents. Formatting that MOBI can express – headings, emphasis, images, paragraph styles – survives. MOBI's quirkier legacy markup (like old-style <font> tags) is translated to modern equivalents so the result passes validation.
One honest caveat: books bought from the Kindle store are usually DRM-protected, and ebook.tools does not remove DRM – we detect it and tell you, rather than producing a broken file. This tool is for the DRM-free MOBIs of the world: Project Gutenberg downloads, indie and technical books, review copies, and your own backups.