EPUB – Electronic Publication
EPUB is the open standard ebook format. Text reflows to fit any screen, and it is supported by nearly every e-reader except older Kindles.
More EPUB conversionsDrop your EPUB files here
or click to choose EPUB files · up to 95MB each
How to convert EPUB to MOBI
- Choose your files. Click Select File or drag your EPUB files into the upload box. You can add many at once.
- Pick the settings. MOBI is already selected as the output format. The conversion starts as soon as a file is added.
- Download. Each file appears in the list when it is ready. Download them one by one, or all together with Download all.
Why convert EPUB to MOBI?
MOBI is the older Kindle format. Converting EPUB to MOBI helps if you have an older Kindle or an app that reads only MOBI.
When to keep the EPUB
For current Kindles, Amazon recommends sending EPUB files through Send to Kindle, which converts them for you; MOBI is no longer accepted there. Use EPUB to AZW3 for newer Kindles connected by USB.
Tips for the best result
- Chapters, images and the table of contents are kept.
- Copy the MOBI to the documents folder of your Kindle over USB.
- Books with DRM cannot be converted.
Common problems and fixes
- Send to Kindle rejects the MOBI.
- Amazon stopped accepting MOBI by email and app in 2022. Send the EPUB instead.
- Fonts and layout look simpler.
- MOBI supports less styling than EPUB, so some formatting is simplified.
MOBI – Mobipocket eBook
MOBI is an older ebook format from Mobipocket that Kindle devices used for years. Amazon has since moved to newer formats.
More MOBI conversionsConverting EPUB to MOBI
- DRM-protected books cannot be converted. PDF input works best for text-based PDFs.
Related guide
- How to read EPUB books on KindleKindles do not open EPUB files directly. Learn the easiest way to send EPUB to Kindle, when to convert to AZW3 or MOBI, and why some books cannot be converted.
Frequently asked questions
Should I use MOBI or AZW3?
AZW3 supports better formatting and is read by all Kindles since 2011. Use MOBI only for very old devices.
Is DRM removed?
No. Protected books cannot be converted.
How do I convert EPUB to MOBI?
Click Select File or drop your EPUB file onto the upload box. The converted MOBI appears in the list below with a download button. You can add many files at once and download them together as a ZIP.
Is it really free?
Yes. There is no sign-up and no watermark. To keep the service available for everyone there is a 95MB limit per file and a cap on how many files one connection can process in a short period.
Are my files stored?
Your upload is used only to make the converted file. Images are processed in memory; other files are written to a private temporary folder that is deleted as soon as the conversion finishes. Nothing is kept after the result has been sent back.
Will quality drop?
For images, a little, by design: the image is re-encoded at the Quality you choose (default 75%). Audio and video are re-encoded with high-quality settings; documents keep their text and layout as far as the target format allows. Converting never restores detail that is already missing from the original.
How this works: your file is uploaded over HTTPS and converted on this server with open-source engines (libvips for images, FFmpeg for audio and video, LibreOffice and Pandoc for documents, Calibre for ebooks, Ghostscript and Inkscape for PDF and vector files). Images are processed in memory; other files use a private temporary folder that is deleted as soon as the conversion finishes.