MOBI to EPUB Converter
EPUB is the format almost every reading app opens, including Amazon's own Send to Kindle since 2022. Convert DRM-free MOBI files to EPUB to move an old library onto Kobo, Apple Books, Google Play Books or a current Kindle.
E-book Converter
or drop EPUB, MOBI, AZW … files here ·
Max 95 MB per file· Up to 20 files· Deleted after 30 minutes
Files are processed on our servers and deleted after 30 minutes.
0 keeps the book's own size. E-readers let the reader change size anyway; this mainly matters for PDF, DOCX and TXT output.
Space around the text on each page. 5 mm suits e-ink screens; use 15–20 mm for a PDF you plan to print.
Justified text has straight edges on both sides like a printed book; left-aligned avoids wide gaps between words on small screens.
A5 is close to a paperback and reads well on tablets. Match device sizes the page to the reading device chosen above.
Keep the book's cover, use the first image as the cover (comics and photo books), or leave the book without one.
JPEG quality for pictures and comic pages. 85 looks identical on e-ink; lower it to shrink large comics.
Leave empty to keep the title stored in the file. This is the name shown in the reader's library.
Leave empty to keep the existing author.
How to use this tool
- 1
Select your MOBI books
Upload up to 20 DRM-free .mobi, .prc or .azw files at once, each up to 95 MB. Each one becomes its own EPUB.
- 2
Keep the defaults or fix the details
Cover stays on Keep and Table of contents is on. Open Advanced settings to correct Title and Author when an old file shows a garbled name in your library.
- 3
Convert to EPUB
Press Convert to EPUB and add the files to your reading app. Uploads are removed from our server after 30 minutes.
MOBI was the Kindle's first format; EPUB is the one that now works on Kindles and everything else, so converting an old MOBI library is a one-way upgrade.
2022the year Send to Kindle started taking EPUB and stopped accepting MOBI
Why convert MOBI to EPUB now
EPUB is an open standard. The International Digital Publishing Forum published EPUB 2 in 2007 and EPUB 3 in 2011, and after the IDPF merged into the W3C in 2017, later versions became W3C Recommendations. Kobo, Apple Books, Google Play Books, Nook, PocketBook and library apps all read it, and since 2022 so does Amazon's Send to Kindle service.
MOBI went the other way. It began at Mobipocket in 2000, became the Kindle format after Amazon bought the company in 2005, and has been winding down since Kindle Format 8 arrived in 2011. Kindle Direct Publishing stopped accepting MOBI for new e-books in 2021. A MOBI library is still readable on Kindles, but it is stuck there; as EPUB it moves to any app and back to a Kindle when you want.
Inside, an EPUB is a ZIP archive of XHTML chapters, a stylesheet, images and a package file listing them in reading order. The converter reads the MOBI text records, splits them into chapters at the book's chapter breaks, rebuilds the navigation from the MOBI index and copies the cover, title, author and language into the package metadata.
MOBI
Mobipocket ebook
MOBI is an ebook format created by Mobipocket around 2000; Amazon bought the company in 2005 and used MOBI as the basis of early Kindle books. It supports reflowable text, bookmarks and basic formatting but handles complex layouts, fonts and images poorly. Amazon has phased MOBI out in favour of EPUB uploads and its newer KF8/AZW3 format. Older Kindles and Calibre still read it.
- Compression
- –
- Transparency
- –
- Animation
- –
- Introduced
- 2000 · Mobipocket (acquired by Amazon)
EPUB
Electronic Publication
EPUB is the open ebook standard, first published by the International Digital Publishing Forum in 2007 and now maintained by the W3C. It packages XHTML, CSS, images and metadata in a ZIP file, so text reflows to fit any screen size and font setting. EPUB 3 adds audio, video, fixed layouts and accessibility features. Apple Books, Kobo, Google Play Books and most reading apps open EPUB, and Kindle accepts it through Send to Kindle.
- Compression
- –
- Transparency
- –
- Animation
- –
- Introduced
- 2007 · IDPF (now W3C)
MOBI to EPUB rescues e-books from the format Amazon retired, so they open in Kobo, Apple Books, Google Play Books and Send to Kindle, all of which accept EPUB and none of which take MOBI uploads anymore.
Where to open the converted EPUB
iPhone and iPad
- 01Save the EPUB to Files.
- 02Tap it and choose Books from the share sheet.
- 03It appears in the Library tab of Apple Books.
Android and Kobo
- 01Upload the EPUB at play.google.com/books, or open it in any EPUB app.
- 02For a Kobo, connect it by USB.
- 03Copy the file to the reader's main folder and eject.
Kindle and desktop
- 01Email the EPUB to your Send to Kindle address or drag it into the Send to Kindle website.
- 02On a computer, open it in Calibre's viewer.
- 03Thorium Reader is a free EPUB reader for Windows, macOS and Linux.
What carries over from MOBI to EPUB
Text, chapter breaks, italics and bold, images, the cover and the core metadata all come through. Old MOBI files often store the author as "Last, First" or leave the language empty; fix those under Title and Author so the library sorts them properly. Turn on Remove extra metadata if you want to drop leftover publisher tags and descriptions.
If you would rather print the book or read it on a computer with fixed pages, MOBI to PDF is the better route. Books from the Russian-language FB2 world follow the same path through FB2 to EPUB.
MOBI to EPUB questions
Will a MOBI converted to EPUB look better than the original?
Not by itself. The MOBI format stored only basic HTML formatting, so the EPUB starts from that simpler styling; nothing lost when the book was first made into a MOBI can be recovered. What improves is how the reading app handles it: modern EPUB readers give better hyphenation, font choices and night modes.
Can I send the converted EPUB to my Kindle by email?
Yes. Send to Kindle accepts EPUB files, converts them to Amazon's format and syncs them across your Kindle devices and apps. Our guide on sending an EPUB to Kindle covers the email address and size limits.
Does the EPUB pass EPUBCheck?
The converter writes a standard EPUB package with a manifest, spine and navigation document, which is what EPUBCheck, the reference EPUB validator, looks at. A MOBI with broken internal links can still produce warnings, and those come from the source book rather than the conversion.
How do I convert a whole folder of MOBI files?
Select up to 20 files in one upload; each is converted separately and keeps its own cover and metadata. For a larger library, repeat in batches of 20.
Can I convert a .prc or .pdb file the same way?
Usually. Many .prc files from early Mobipocket stores are MOBI books under another extension, and they convert like any MOBI. A .pdb can also be a Palm eReader or other Palm database book, which reads only if it is a format the converter recognizes.