Free Online EPUB to MOBI Converter
Convert EPUB to MOBI online for free.
Max file size 50MB. Sign up for more.
| File Name | Size | Convert To |
|---|
Checking files and selected output formats.
What to expect when converting EPUB to MOBI
A 500 KB EPUB typically becomes 550 – 600 KB as MOBI.
Quality: Text and chapter structure preserved. Some CSS styling and advanced layout from EPUB 3 may not render in MOBI.
Best for: reading on older Kindle devices that don't support EPUB natively.
Avoid when: you have a modern Kindle (post-2022) which supports EPUB directly via "Send to Kindle".
Tip: Amazon now accepts EPUB via "Send to Kindle" — MOBI is mostly obsolete unless you have a pre-2022 Kindle.
EPUB to MOBI — Modern ebook → older Kindle side-load
EPUB → MOBI handles side-loading books to older Kindle devices (pre-2018 Paperwhite and Oasis). Modern Kindles accept EPUB directly via the Send-to-Kindle service. Convert to MOBI only when you're side-loading via USB to an older device or when a self-publishing tool specifically wants MOBI. For anything new, EPUB or the newer AZW3 are the right choices.
EPUB to MOBI: converting for older Kindle devices
MOBI (Mobipocket) is Amazon's older ebook format used by legacy Kindle devices. Both EPUB and MOBI contain reflowable HTML content, but MOBI uses a different packaging structure and supports a subset of CSS compared to EPUB. The conversion repackages the HTML content, converts or simplifies CSS styles, regenerates the table of contents in MOBI's format, and applies PalmDOC or HUFF/CDIC compression. Modern Kindle devices support KFX and EPUB, making MOBI increasingly obsolete.
Convert EPUB to MOBI for sideloading onto older Kindle devices (pre-2022 models) that don't support EPUB natively. Newer Kindle devices accept EPUB directly via USB or Send-to-Kindle. Amazon also recommends uploading EPUB for Kindle publishing rather than MOBI.
EPUB vs MOBI: Side-by-side
Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.
| Property | EPUB | MOBI |
|---|---|---|
| Full name | Electronic Publication | Mobipocket eBook |
| Year introduced | 2007 | 2000 |
| Developer / standard body | W3C (formerly IDPF) | Mobipocket / Amazon |
| MIME type | application/epub+zip | application/x-mobipocket-ebook |
| File extension | .epub | .mobi |
| Compression | ZIP-compressed XHTML + CSS | PalmDOC compression |
| Color / data depth | N/A | N/A |
| Max dimensions / size | Software-limited | Software-limited |
| Transparency | No | No |
| Animation | No | No |
| Standard / specification | W3C EPUB 3.3 / ISO/IEC 23736 | Mobipocket |
| Best for | Apple Books, Kobo, Nook, Google Play Books — reflowable text | Older Kindle devices (replaced by AZW3 then KFX) |
EPUB to MOBI FAQ
Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert EPUB files to MOBI.
Can I convert EPUB books to MOBI for my Kindle or Kobo?
How to convert EPUB to MOBI without losing the table of contents
Can I convert multiple EPUB ebooks to MOBI at once?
Does the text still reflow after converting to MOBI?
Which reader is MOBI for?
What is EPUB?
Do I still need to convert EPUB to MOBI for my Kindle?
Will my EPUB formatting survive the conversion to MOBI?
Document Conversion Guides for EPUB to MOBI Converter
Read guides about PDF, Word, and editable document workflows connected to EPUB to MOBI Converter.
How to Convert Kindle Books to EPUB — DRM-Free Guide
Convert Kindle books to EPUB for reading on Kobo, Apple Books, or any e-reader. Covers DRM-free books, format differences, and conversion tools.
Ebook Formats Explained — EPUB, MOBI, PDF, AZW3, KFX & More
A complete guide to ebook formats. Compare EPUB, MOBI, AZW3, PDF, and KFX by reader support, features, and when to use each.
EPUB vs PDF vs MOBI — Which Ebook Format Is Best for Reading?
EPUB, PDF, and MOBI each handle ebooks differently. This guide compares reflowable text, device compatibility, DRM, and reading experience to help you pick the right format.
How to Open EPUB Files Without a Kindle — Free Readers for Every Device
Got an EPUB file and not sure how to open it? Here are the best free EPUB readers for Windows, Mac, iPhone, iPad, Android — and how to read EPUBs on a Kindle.
How to Compress PDF for LinkedIn Upload (Documents and Resumes)
LinkedIn accepts PDF uploads for carousel-style document posts and resumes. Here is how to optimize them for fast loading, mobile viewing, and maximum engagement.