Free MOBI to EPUB converter
MOBI to EPUB converter that repairs old Kindle files
To convert MOBI to EPUB, choose your file: epubwise turns chapter titles into real headings and cleans up the old markup, for a valid EPUB, free and without an account.
Convert a MOBI to EPUB
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- Opens in any reading app
Free: 10 files a day. Only convert books you have the right to convert. DRM-protected books, such as most store-bought Kindle books, can't be converted.
moby_dick.epub EPUB version 3.0 Real headings 145 EPUBCheck errors 0
<h2 id="filepos53519" class="calibre_" style="font-size:1em;font-weight:normal"><span class="calibre1"><span class="bold"> CHAPTER 1. Loomings. </span></span></h2>
No errors or warnings detected. Messages: 0 fatals / 0 errors / 0 warnings / 0 infos EPUBCheck completed
Why MOBI files need converting now
MOBI was Amazon's ebook format for the first Kindles. It has been retired: Amazon's Send to Kindle service no longer lists MOBI among the files it accepts, and outside the Kindle world almost no reading app ever opened it. EPUB is the open standard that replaced it, so a MOBI that sits unread in a downloads folder becomes readable again on a phone, tablet, Kobo or Nook once it is an EPUB.
Newer Kindles read EPUB too, through Send to Kindle, which converts it for the device. Our guide to sending a book to a Kindle covers the steps; they are the same for an EPUB made here.
What carries over
Chapters
The table of contents comes across, so the reading app shows the same chapter list.
Formatting
Italics, headings, pictures and the cover are kept.
Book details
The title and author stored in the file go into the EPUB, so it files itself correctly in your library.
How it compares: 8 MOBI to EPUB converters tested
Tested 4 November 2026. Two public-domain Kindle files from Project Gutenberg (Alice's Adventures in Wonderland and Moby-Dick, an older MOBI) went through each converter's free tier with default settings and no account. One script measured every EPUB the same way, and EPUBCheck, the official validator, checked each one (errors are the two books added together).
| Converter | Text kept (Alice) | Contents entries as real headings (Moby-Dick) | EPUBCheck errors | Broken links | Title, author, cover | Format |
|---|---|---|---|---|---|---|
| epubwise Calibre 9.17, plus our clean-up | 100% | 145 of 145 | 0 | 0 | kept | EPUB 3 |
| Calibre (default settings) Calibre 9.13, the desktop program | 99.8% | 0 of 145 | 372 | 0 | kept | EPUB 2 |
| AnyConv Calibre 4.3 | 99.8% | 0 of 145 | 372 | 0 | kept | EPUB 2 |
| CloudConvert Calibre 8.5 | 99.8% | 1 of 145 | 356 | 1 | kept | EPUB 2 |
| Convertio Calibre 4.99 | 99.8% | 0 of 145 | 372 | 0 | kept | EPUB 2 |
| FreeConvert Calibre 9.13 | 99.8% | 0 of 145 | 372 | 0 | kept | EPUB 2 |
| online-convert.com Calibre 9.15 | 99.8% | 0 of 145 | 372 | 0 | kept | EPUB 2 |
| XConvert Calibre 9.2 | 100% | 1 of 145 | 272 | 3 | kept | EPUB 3 |
What the numbers say. Every converter here, ours included, runs Calibre underneath, so the text, the contents list and the book details come through the same everywhere. Three things differ. Older MOBI files mark chapter titles only as big bold text; the other converters copy them across as ordinary paragraphs, so a reading app, a screen reader or your own styles can't tell where a chapter starts. epubwise turns each title the contents list points to into a real heading, styled to look the same. Old Kindle files are also full of markup the EPUB standard doesn't allow, and the others pass it on: hundreds of validator errors, in a file that may still open but that strict readers and stores can refuse. epubwise repairs it. And two converters left links that lead nowhere; epubwise removes the dead link and keeps its text.
Where others did better: nothing we measured here. XConvert also makes EPUB 3, the newer version of the format, and the rest make EPUB 2. Ours is EPUB 3 and keeps the older contents file too, so older e-readers can still use it. Our 100% and XConvert's for Alice come from the contents page EPUB 3 adds, which repeats the chapter titles; without it, the text is the same 99.8% as everyone's. For why EPUB replaced MOBI, see EPUB vs MOBI.
Which MOBI files work
DRM-free ones: old downloads from Project Gutenberg and other free libraries, files you made yourself with Kindle tools, and review copies sent without copy protection. A MOBI or AZW bought from the Kindle store is locked to your Amazon account, and the converter will tell you so rather than produce a broken file. For the newer Kindle format, use the AZW3 to EPUB converter.
The conversion runs on Calibre, the free ebook program, and your file is deleted within an hour. If what you have is a PDF rather than a MOBI, convert the PDF to EPUB instead.
Questions
Will a Kindle still read the EPUB?
Yes. Newer Kindles take EPUB files through Amazon's Send to Kindle, which converts them for the device.
Why does my MOBI file say it is DRM-protected?
It was bought from the Kindle store, or came from a library or shop that locks its files to one account. Only DRM-free files can be converted.
Is MOBI to EPUB free?
Yes: 10 files a day, no sign-up, and the EPUB is deleted from our server within an hour.
Kindle and Send to Kindle are trademarks of Amazon.com, Inc. epubwise is not affiliated with Amazon.