this post was submitted on 01 Aug 2025
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No, Amazon took away the "Download and transfer via USB" option when downloading your books. Making it more difficult to strip DRM, but also to conveniently add it to multiple devices. I prefer to keep my eReaders offline and manage them with Calibre.
Regarding sideloading EPUBs with Calibre, it's not really doing that. Under normal circumstances Kindle can't read EPUB format at all, so Calibre will convert it to a native format, either MOBI or AZW3 generally. But with a jailbroken Kindle and KOReader, you can actually read EPUBs natively. I've actually converted my entire collection to EPUB and deleted the AZW3 and KFX files.
Oh my bad.
Any reason why those formats are worse than epub?
It's really just that only Amazon uses AZW3 and KFX. MOBI is deprecated, and nobody really uses it anymore, not even Amazon. KFX is DRMed to hell, and I'm not sure about it, but most AZW3 files are just DRM wrappers for EPUB anyway. This is why the KindleUnpack plugin for Calibre can strip out EPUBs from most AZW3 files and retain formatting without needing conversion.
Basically, AZW3 and KFX are for Kindle, and only for Kindle. EPUB is an open standard that literally every device that's not a Kindle uses.
I already own a non-Amazon reader that's my main reader, and I want to move away from Amazon's ecosystem.