Calibre is super user-friendly, so don't worry if you're not a tech whiz. Just open up the software, add your Kindle book to the library, and then click on the "Convert books" option. From there, you can choose the output format (in this case, PDF), and voilà! Your book will be converted in no time.
One of the coolest things about Calibre is that it also allows you to edit the book's metadata, like the title, author, or cover art. So, if you're feeling creative, you can get in there and customize your book to your heart's content. It's like having your very own personal library!
Create an eBook with Kindle Create - ASK Design Blog