
Compatible formats now include EPUB (.epub), which you can send to your library using the new Send to Kindle for Web, the free Kindle app. Any existing MOBI files you want to read with our most up-to-date features for documents will need to be re-sent in a compatible format. MOBI is an older file format and won’t support the newest Kindle features for documents.


Any MOBI files already in your library will not be affected by this change. We wanted to let you know that Send to Kindle will soon remove the ability to send MOBI (.mobi. We noticed that the following document(s), sent by you at 03:30 PM on Tue, GMT are in MOBI (.mobi. When I sent it to my Kindle, I received the following email from amazonĭear Kindle Customer, Thank you for using the Send to Kindle service to send personal documents to your Kindle library. I think that the latest format is something like azw3

That’s saying nothing of innovations like color e-ink and stylus support.On your site, the Kindle version of the manual is in in the outdated mobi format. These more versatile devices generally run Android, meaning that they can access Kindle libraries via Amazon’s app on top of easily loading up DRM-free files. Meanwhile competitors like Onyx, Xiaomi, and Pocketbook have been offering tons of new tech and form factors.

Kindle models have iterated in teeny-tiny increments for years, only gaining USB-C charging support on the latest models. This is entirely speculative on my part, but it seems to me that the widening market of ebook readers is making Amazon sweat a little. Amazon announced support for ePub files in the Send To Kindle and Kindle Documents Service earlier this year. An analogy might be the Sony-branded MP3 players from the early 2000s which didn’t actually play MP3s, instead insisting users convert all their music to the proprietary ATRAC format. Kindle refusing to allow easy use of the most common open digital book standard was a glaring downside to Amazon’s mostly-closed system.
