z3kit Akbook can easily retrieve your kindle books from your kindle cloud reader cache. And then convert them to other formats, like mobi, azw3, pdf, epub. To efficient use it, follow steps below:

First of all, you must use google chrome browser or microsoft's latest edge browser (chromium core). Use kindle cloud reader, make sure the offline cache is open, within it, download your books.

1. Just open z3kit Akbook
2. All your downloaded books will dispaly on the left panel
3. And then, at top right corner, choose the output format you want
4. Drag & drop the books from left panel to the main panel
5. That's all

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If you can not turn on the offline cache, you can download the chrome plugins here: