No mods required whatsoever, just get your ebooks in whichever format you can and then use https://calibre-ebook.com/ to convert them to .mobi and copy them over via cable. If possible, avoid pdf's - they can be converted, but it often looks shit. EPUB on the other hand converts with zero loss, and that's the most common format on libgen.rs and other ebook sites. If MOBI is available right away, just go for that of course. Conversion takes mere seconds though.

Since I don't buy any ebooks from Amazon directly, I've set my kindle to flight mode right after the initial setup and haven't switched it back on in over 4 years.

Seconding the Calibre recommendation!

Set it to airplane mode the day it arrives and never let it go online with the stock firmware if you value privacy - these beasts even send amazon the page you are reading currently on. Calibre is the best tool, it autoconverts anything if needed. It also has an RSS-to-newspaper feature that can create a custom newspaperlike magazine from your favorite feeds for you. Reading manga on Kindle is really fun.

I jailbroke my old Kindle paperwhite a while ago and installed Koreader on it and just read Epub through that without having to convert anything. No internet, no amazon and you can get second hand Kindles for cheap.

if you want to jailbreak it, there’s a spreadsheet somewhere detailing which models to avoid

but honestly, before i figured out i could jailbreak mine, i was just using it in airplane mode 24/7 and transferring stuff over usb with the EXCELLENT software Calibre. highly highly recommend! the only benefit i get from the jailbreak is that i can use a more customizable reader (fonts, margins, night mode), and that i can now transfer stuff from Calibre over wi-fi without having to create an amazon account. bliss!

Kindles support ePub now, the most common ebook format. Finally!

Amazon has a computer app Send to Kindle that makes it effortless to send eBooks to your kindle. Just grab whatever book you want from Anna’s Archive, open in send to kindle and send it to your device.

Later on you could even automate with readarr. Set it to look at your Goodreads to read list and automatically send those books to your kindle.

You can also email your ebooks straight to it which can be really useful.

Thanks everyone! Glad to hear that I won't need to use anything other than calibre. Can't wait to get the kindle!

I owned several Kindles.. I got a different e-reader, and I'm not going back to Kindle. Do some research and see if there are any alternatives.

As others said Kindle has the feature of loading pirated ebooks using Calibre or Amazon's kindle email..

Highly recommend getting a Kobo instead.

Is there anything that can convert the Amazon kindle files to EPUB? Seems like a big barrier to using Calibre if I can't get my already bought books.

Get a Kobo instead? Kindle are annoying as shit.