Convert MOBI to EPUB online for free.
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Checking files and selected output formats.
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A 500 KB MOBI typically becomes 500 – 600 KB as EPUB.
Quality: Chapter structure and text preserved cleanly. Kindle-specific formatting (page-numbering, X-Ray data) is lost.
Best for: reading on non-Kindle devices — Apple Books, Kobo, Nook, Google Play Books all support EPUB natively.
Avoid when: you only read on Kindle — MOBI/AZW3 is the native Kindle format.
Tip: Modern Kindles (post-2022) also support EPUB via Send-to-Kindle, so this conversion is increasingly optional.
EPUB is the open ebook standard — reflows text, supports tables of contents and metadata, works on every e-reader except Kindle (which uses MOBI/AZW3 natively but converts EPUB on upload). Convert to EPUB when publishing to Apple Books, Kobo, Google Play Books, or shipping direct-to-reader PDFs / DOCX manuscripts.
MOBI's internal structure is HTML-based, similar to EPUB, but uses Amazon's proprietary packaging and index format. The conversion extracts the HTML content and images from the MOBI container, reconstructs chapter structure from the MOBI's index records, applies CSS formatting, and repackages everything as a standard EPUB. DRM-protected MOBI files (purchased from Amazon) cannot be converted — the content is encrypted with the device's serial number.
Convert MOBI to EPUB for reading on non-Kindle e-readers (Kobo, Nook, Apple Books) and reading apps that support EPUB but not MOBI. EPUB is the universal ebook standard supported by virtually all reading platforms except legacy Kindle.
Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.
| Property | MOBI | EPUB |
|---|---|---|
| Full name | Mobipocket eBook | Electronic Publication |
| Year introduced | 2000 | 2007 |
| Developer / standard body | Mobipocket / Amazon | W3C (formerly IDPF) |
| MIME type | application/x-mobipocket-ebook | application/epub+zip |
| File extension | .mobi | .epub |
| Compression | PalmDOC compression | ZIP-compressed XHTML + CSS |
| Color / data depth | N/A | N/A |
| Max dimensions / size | Software-limited | Software-limited |
| Transparency | No | No |
| Animation | No | No |
| Standard / specification | Mobipocket | W3C EPUB 3.3 / ISO/IEC 23736 |
| Best for | Older Kindle devices (replaced by AZW3 then KFX) | Apple Books, Kobo, Nook, Google Play Books — reflowable text |
MOBI is an ebook format originally developed by Mobipocket SA and later acquired by Amazon in 2005 for use on Kindle devices. Based on the Open eBook standard with proprietary extensions, MOBI supports reflowable content, bookmarks, annotations, and basic formatting including images, tables, and text styles. It became the primary format for personal documents and sideloaded content on Kindle eReaders, working on every Kindle model ever produced.
Amazon has since deprecated MOBI in favor of the more capable AZW3 (KF8) and KFX formats, which support enhanced typesetting, embedded fonts, and responsive layouts. As of 2022, Amazon's Send to Kindle service no longer accepts MOBI files for email delivery. However, MOBI remains widely used for legacy Kindle compatibility and is still supported by many third-party reading apps. Converting MOBI to EPUB allows reading on non-Kindle devices, while converting to AZW3 provides a modern Kindle reading experience.
Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert MOBI files to EPUB.
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