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EPUB to MOBI Converter

Make a MOBI copy of a DRM-free EPUB for an older Kindle that you load over USB.

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About EPUB to MOBI

EPUB to MOBI keeps older Kindles useful. Many e-books you buy DRM-free or download from public-domain libraries come as EPUB, which older Kindle models can't open. Convert the book to MOBI, connect the Kindle to your computer with a USB cable and copy the file into its documents folder.

For a recent Kindle you may not need MOBI at all, because Amazon's Send to Kindle service accepts EPUB directly and no longer takes MOBI files. AZW3 is the newer Kindle format and keeps more formatting, so try EPUB to AZW3 if your Kindle reads it. Only DRM-free books can be converted.

How to use EPUB to MOBI

  1. 1
    Upload the EPUB

    Pick a DRM-free .epub from your computer or phone.

  2. 2
    Click EPUB to MOBI

    The book is converted on our server, in an isolated process.

  3. 3
    Copy it to the Kindle

    Download the .mobi, plug in the Kindle by USB and drop the file into the documents folder.

Why use Cubfile for this

  • Made for older Kindles

    MOBI is the format every Kindle model can open, including the oldest ones.

  • Sideload over USB

    No email address or Amazon settings needed; just copy the file across.

  • Nothing to install

    Convert without Calibre or any desktop app, from any browser.

  • Private by default

    Books are deleted from our servers automatically after an hour.

FAQ

EPUB to MOBI: questions and answers

Do I still need EPUB to MOBI for Send to Kindle?
No. Send to Kindle now takes EPUB files and no longer accepts MOBI. Use MOBI when you copy books to an older Kindle over USB. For PDFs and Word files, Convert for Kindle prepares a version that reads well on your model.
Can I convert EPUB to MOBI if the book has DRM?
No. Copy-protected books can't be converted, and we don't remove DRM. The tool is for DRM-free EPUBs.
How do I put the MOBI on my Kindle?
Connect the Kindle to your computer with a USB cable, open it like a drive and copy the .mobi into the documents folder. Eject it and the book appears in your library.
MOBI or AZW3, which is better?
AZW3 keeps more formatting, such as embedded fonts and better tables, and works on most Kindles still in use. MOBI is the safe choice for the oldest models.
How many books can I convert for free?
2 without an account and 2 a day with a free account, up to 50 MB each. VIP has no daily limit.
Share EPUB to MOBI with a friendIt runs in any browser, and they can try it without signing up.

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