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EPUB to AZW3 Converter

Make a Kindle AZW3 file from a DRM-free EPUB and copy it to your Kindle with a USB cable.

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About EPUB to AZW3

EPUB to AZW3 is for putting DRM-free books on a Kindle without email: copy the file over USB and it shows up in your library, with no Send to Kindle address and no cloud upload. AZW3, also called KF8, is Amazon's newer Kindle format, and it keeps more of a book's layout than the old MOBI, such as embedded fonts, better tables and richer styling. To move a DRM-free AZW3 back to EPUB later, use AZW3 to EPUB.

Upload the .epub, download the .azw3, connect the Kindle and drop the file into its documents folder. It's a good route for books from DRM-free shops, public-domain libraries or your own writing. Books with DRM can't be converted.

How to use EPUB to AZW3

  1. 1
    Upload the EPUB

    Choose a DRM-free .epub or drag it into the page.

  2. 2
    Click EPUB to AZW3

    The Kindle file is built on our server in an isolated process.

  3. 3
    Copy it over USB

    Download the .azw3 and put it in the documents folder on your Kindle.

Why use Cubfile for this

  • Kindle's newer format

    AZW3 keeps embedded fonts, tables and styling better than MOBI.

  • No email needed

    Sideload directly by cable, even without Wi-Fi on the Kindle.

  • Browser only

    No Calibre install; convert from any computer or phone.

  • Deleted automatically

    Your books leave our servers after an hour.

FAQ

EPUB to AZW3: questions and answers

When should I use EPUB to AZW3 instead of Send to Kindle?
When you'd rather copy books by cable, have no Wi-Fi on the Kindle, or want a file you can keep and reuse. Send to Kindle accepts EPUB directly if you prefer email.
Where do I put the AZW3 on my Kindle?
Connect the Kindle by USB, open it like a drive and copy the file into the documents folder. It shows up in your library after you eject it. For the oldest Kindle models, EPUB to MOBI is the safer choice.
Can EPUB to AZW3 convert books with DRM?
No. Only DRM-free EPUBs can be converted; we don't remove copy protection.
What does it cost to convert EPUB to AZW3?
Within the free plan, nothing: 2 tasks in total without an account, or 2 a day with one, for files up to 50 MB. VIP lifts the limits.
Is my book kept private when I convert EPUB to AZW3?
Yes. Uploads are encrypted, each conversion runs in isolation, and files are deleted automatically after an hour.
Share EPUB to AZW3 with a friendIt runs in any browser, and they can try it without signing up.

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