How do I convert MOBI to EPUB with Calibre?

Open Calibre, click Add books → select your .mobi file. Right-click → Convert books → Convert individually. Set Output format to EPUB in the top-right dropdown. Click OK. The conversion takes a few seconds. Right-click the book → Open containing folder to find the .epub file. Calibre is free and works on Windows, Mac, and Linux.

Can I convert MOBI to EPUB online for free?

Yes. Online converters like Zamzar and Convertio convert MOBI to EPUB in a browser — no install. Upload the .mobi file, choose EPUB output, download the result. These work for DRM-free files only. For large libraries, Calibre is faster and more reliable. Note: your file is uploaded to their servers, so avoid sensitive documents.

Why did Amazon deprecate MOBI?

Amazon deprecated MOBI in 2022 because EPUB became the universal ebook standard and Kindle's own KFX format superseded MOBI internally. As of 2022, Amazon no longer accepts .mobi files for KDP publishing or Send to Kindle. Kindle devices still open old .mobi files stored locally, but new content uses EPUB3 (which KDP converts to KFX internally).

Can I still read MOBI files after converting to EPUB?

Yes — the EPUB is a complete conversion of the MOBI content. Text, images, chapter structure, and metadata all transfer. You can keep the original MOBI as a backup. The EPUB will work on Kobo, Apple Books, Google Play Books, Thorium Reader, and any EPUB-compatible reading app — a much wider range than the original MOBI.

How to Convert MOBI to EPUB — Free with Calibre (2026 Guide)

Amazon deprecated the MOBI format in 2022. If you have a library of old MOBI files — downloaded before Kindle switched to EPUB — converting them to EPUB ensures they'll work on any reading app, not just Kindle. Here's how to convert MOBI to EPUB for free.

Why Convert MOBI to EPUB?

MOBI is deprecated: Amazon stopped accepting .mobi uploads to KDP in 2022. Kindle devices still open old .mobi files locally, but you can no longer send them via Send to Kindle email or the website.
EPUB works everywhere: Kobo, Apple Books, Google Play Books, Thorium Reader, Moon+ Reader, and every other reading app reads EPUB. MOBI works only on Kindle.
Future-proofing: Converting your MOBI library to EPUB now means your books will open in whatever reading app you use in five years.

Method 1: Calibre (Best, Free, Offline)

Calibre is the most reliable MOBI-to-EPUB converter. It's free, open-source, and handles all variants of the MOBI format.

Download and install Calibre from calibre-ebook.com (free, Windows/Mac/Linux).
Open Calibre and click Add books → select your .mobi file(s).
Right-click the book → Convert books → Convert individually.
Set Output format to EPUB in the top-right dropdown.
Click OK. Calibre converts the file in a few seconds.
Right-click the book in Calibre → Open containing folder to find the .epub file.

Batch conversion: Select multiple MOBI files, right-click → Convert books → Convert individually (repeat for each), or use Bulk conversion for identical settings.

Method 2: Online Converters

Services like Zamzar and Convertio convert MOBI to EPUB in a browser — no software install. Upload the .mobi file, select EPUB as the output, and download the result. These work well for single files but have size limits (typically 50–100 MB) and upload your file to a third-party server.

When to use: You're on a computer where you can't install Calibre, or you need a quick one-off conversion.

What About DRM-Protected MOBI Files?

Kindle books purchased from Amazon are DRM-protected — they are locked to your Amazon account and cannot be converted by Calibre or any other tool without removing the DRM first. Converting DRM-protected books may violate Amazon's terms of service. This guide only covers DRM-free MOBI files (sideloaded books, personal documents, books from DRM-free publishers).

After Converting: Where to Read Your EPUB

Kobo: Connect via USB and copy the .epub to the Books folder. Or use the Kobo desktop app.
Apple Books: Double-click the .epub on Mac, or tap it in Files on iPhone/iPad.
Google Play Books: Go to play.google.com/books → Upload files.
Kindle: Send via Send to Kindle — Kindle now accepts EPUB directly since 2022.
Thorium Reader / Moon+ Reader: Open the .epub directly from local storage.

Coming From a PDF?

If your original file was a PDF (not a MOBI), the best workflow is PDF → EPUB directly — no intermediate MOBI step needed. Go to toolkit.bot/pdf2epub, upload your PDF, and download an EPUB in 30 seconds. Works on all devices, no install required.

Have a PDF you want to read on Kobo, Apple Books, or any EPUB reader? Convert it directly to EPUB — no MOBI step needed.

Convert PDF to EPUB →