Amazon Will Stop Accepting* Mobi Files in June

It’s finally happened.

Amazon has announced that soon it will no longer accept* Mobi files in KDP. They just sent out an email informing authors and publishers that Epub and Doc are now the preferred formats:

We listened to your feedback and are making it simpler to publish eBooks on Kindle. Starting June 28, 2021, we will no longer support files in MOBI, PRC or AZK formats when publishing new reflowable eBooks or updating the content for previously published eBooks. Instead, we ask publishers to use EPUB, KPF (Kindle Create files), or DOC/DOCX (Microsoft Word files) files for reflowable eBooks. Please note MOBI files are still accepted for fixed-layout eBooks.
You don’t need to take any action for reflowable eBooks already published unless you are updating the eBook files. If you are uploading new or updated content, see our Kindle Publishing Guidelines:

And before you nitpick my language, yes, I know that it’s clunky. So is their new rule, which is basically that Amazon will only accept Mobi files for the one type of Kindle ebook which no one makes any more.

Why they decided to keep that around, I do not know.

via Create If FB group

image by Sergey Galyonkin via Flickr

Nate Hoffelder

View posts by Nate Hoffelder
Nate Hoffelder is the founder and editor of The Digital Reader. He has been blogging about indie authors since 2010 while learning new tech skills weekly. He fixes author sites, and shares what he learns on The Digital Reader's blog. In his spare time, he fosters dogs for A Forever Home, a local rescue group.


  1. Disgusting Dude17 March, 2021

    Because if they keep accepting it they won’t need to change their tools and workflow for whatever small segment might use it. Saves money.
    Usage must not be absolute zero.

  2. Calee17 March, 2021

    Also the Kindle Children’s book format allowed for a tap to zoom text box feature. It’s worth continuing to support. We are thrilled that they now take ePub fixed layout for kids picture books, but the other format was a good one.

  3. Hannah Steenbock17 March, 2021

    I can see them do that since the stopped updating KindleGen years ago.

    My worry is that this will make side-loading impossible in the long run, locking Kindle users completely into the Amazon store. I for one would hate that, because it means I could no longer send out ARCs or reader magnets or any of that.

  4. Tex19 March, 2021

    More speculation/discussion is also on MobileRead:

    ” MOBI support for reflowable files ending on June 28, 2021″

  5. Aaron23 March, 2021

    I agree with Hannah, it feels like one more way they can control the files. I assume just because we upload an ePub they will still be converting it to a Mobi/KF8/KFX equivalent file and our Kindles wont magically start using ePub files after June 28.


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