Does Amazon removing Send to Kindle's MOBI support affect Push to Kindle?

Amazon sent all Kindle users mail “that starting August 2022, you’ll no longer be able to send MOBI (.mobi, .azw) files to your library” because “MOBI is an older file format and won’t support the newest Kindle features for documents.” “Also, compatible formats now include EPUB (.epub), which you can send to your library.”

Which format does Push to Kindle use? Does this change affect it in any way?

We use the MOBI format currently, but in generating the MOBI file we produce an EPUB as a first step. So this change won’t affect Push to Kindle. Before the August deadline we will be switching to sending the EPUB file we already produce instead of the MOBI file.

We wrote a little about this change here: EPUB support in Kindle's Personal Documents Service -

That’s great to hear! I had a feeling you use MOBI, but didn’t think to check your blog.
It raises some questions though:

  1. Since the EPUB support is immediate, may I ask when will you make the actual change?
  2. Will you consider updating your blog post that you make the change not just because of the official support of EPUB but also because the removal of support for MOBI?
  3. Push to Kindle is not just a web app but also various offline apps. Does it matter that Send to Kindle Applications still don’t support EPUB? Or do you use the e-mail service inside your apps anyway?


We haven’t decided when we’ll make the change, but sometime before August. We’re testing already and so far haven’t noticed any issues with the EPUBs we produce so Push to Kindle users shouldn’t be affected after the change.

The Push to Kindle apps all use the web service that powers the web application, so no app updates will be required for this change.

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