MOBI to EPUB 3 Converter
Processing entirely on your device — large files may take a moment.
MOBI is Amazon Kindle’s legacy e-book format (also AZW/AZW3). It predates EPUB adoption and still circulates in older book collections. Convert EPUB 3 files like EPUB — content documents extract the same way.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How MOBI compares to EPUB 3
| MOBI | EPUB 3 | |
|---|---|---|
| Layout | Reflowable, dated engine | Reflowable (fixed-layout option) |
| Editability | Limited tooling | Zip of XHTML — editable |
| Bundling | Single self-contained file | Whole book in one file |
| Best for | Legacy Kindle devices | Universal e-book distribution |
How to convert MOBI to EPUB 3
- 1
Select your files
Drag & drop your MOBI files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to EPUB 3". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted EPUB 3 file individually, or grab everything at once as a ZIP archive.
About the MOBI format
MOBI is the Mobipocket format Amazon adopted for the original Kindle (2007), later extended as KF8/AZW3. It reflows text like EPUB but with a fraction of the formatting capability — basic styles, images, bookmarks — and its metadata model is decades old. Amazon stopped accepting MOBI uploads for reflowable ebooks in 2022 in favor of EPUB.
Its remaining role is old hardware: early Kindle models and some e-readers that never learned EPUB. Note that DRM-protected Kindle books (AZW/KFX with encryption) are a separate, legally distinct matter from converting MOBI files you created or that are DRM-free.
+ Strengths
- ✓Supported by legacy Kindle hardware
- ✓Compact and self-contained
! Limitations
- −Deprecated by Amazon since 2022
- −Weak formatting compared to EPUB3
- −Modern Kindle models prefer EPUB/AZW3
About the EPUB 3 format
EPUB is the open standard of e-books (IDPF, now W3C): a ZIP package of XHTML chapters, CSS styling and metadata, rendered reflowably on any screen size. Text re-wraps to your phone, your e-reader and your monitor; font size, margins and typography belong to the reader, not the publisher. EPUB3 adds fixed-layout support, media overlays (read-aloud) and rich semantics.
It is the universal format of every ebook platform except Kindle (Amazon accepts EPUB uploads since 2022 but converts internally). DRM is optional — many EPUBs are open, library books use Adobe ADE encryption. For text-centric books it is the right long-term choice; heavily designed print layouts survive conversion imperfectly.
+ Strengths
- ✓Reflows to any screen — the point of e-books
- ✓Open standard, future-proof, tool-rich
- ✓Accepted by every store and reader app
! Limitations
- −Kindle devices still need conversion to Kindle formats
- −Complex print layouts translate imperfectly
- −DRM variants need specific readers
Why convert MOBI to EPUB 3?
There is a concrete reason this conversion exists: Deprecated by Amazon since 2022 EPUB 3 sidesteps that — Reflows to any screen — the point of e-books If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this MOBI to EPUB 3 converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for MOBI to EPUB 3?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Is it legal to convert my MOBI ebook?
Converting ebooks you legitimately own for personal use is generally fine. Removing DRM protection is a separate legal question that varies by country — this tool does not and will not break copy protection.
What about images and covers?
Embedded images and the cover are extracted and re-embedded in the output where the format supports them. Heavily designed layouts may simplify, but the pictures themselves come through.