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Re:Ask HN: EReader for walking outdoors with DRM-free techni... by f0e4c2f7 on Monday November 07, 2022 @07:54AM (#33505171)
I use the kindle paperwhite this way. You can convert from EPUB to a kindle friendly format and send them to the kindle using Calibre[0].

Other open source devices like the kobo seem really cool and I'd like to try one but my kindle is still working some years later so it's all I've used.

[0] https://calibre-ebook.com/

Re:Ask HN: EReader for walking outdoors with DRM-free techni... by eftepede on Monday November 07, 2022 @07:58AM (#33505225)
Note: nowadays EPUB is a 'kindle friendly format'. Amazon promised to ditch .mobi support (when sending as e-mail or using Send To Kindle apps) on August. They still work (you will have an e-mail with a warning 'in August 2022 it will be gone', lol), but people are encouraged to use EPUB.

I assume there is some conversion from EPUB to 'new mobi' (azw3 maybe, I forgot the name), but it's on Amazon's side. I've sent 20+ EPUBs via e-mail to my Kindle in the last two months and all of them work like a charm, no problems with formatting and stuff.