Can I use this to change my purchased kindle books into ebooks for all devices?

I’m somewhat tech literate, but pretty ignorant about e-book file types.

In case the question isn't about the format but about the DRM, Apprentice Alf has a wonderful plugin for Calibre: https://apprenticealf.wordpress.com

And unfortunately I don't think the DRM for the latest format (KFX) has been cracked yet. The best anybody can do is work around it by getting Amazon to send you the book in an older Kindle format but then you lose all the nice things that you get with KFX.

April 2018: As of version 6.6.0, Apprentice Alf's DRM removal tools support Amazon's newer .kfx file format. You'll also need to install the KFX conversion plugin(link is external) to import your .kfx files into Calibre.

https://www.geoffstratton.com/remove-drm-amazon-kindle-books

https://github.com/apprenticeharper/DeDRM_tools

The README says this:

> Note that DRM can only be removed from KFX format files downloaded with Kindle for PC/Mac 1.26 or earlier. Amazon changes the DRM for KFX files in Kindle for PC/Mac 1.27 and later.

KFX is different from older versions in that the file is tailored to the device it is downloaded on. If you download with the Kindle for PC, the file is optimized for your big, high resolution screen and isn't going to be great on an eink device.

There are no cracks that work with the KFX files extracted from the Kindle reader.