Turn an AZW3 (KF8) ebook into a PDF with real text and images - here in this tab, with nothing uploaded.
AZW3 files are personal libraries. The book is laid out by your browser and saved from its print dialog, so it never leaves your computer.
Your browser lays the book out as pages, and its print dialog is where you choose 'Save as PDF'. That gives a PDF with real, selectable text and sharp images, not pictures of pages.
Only if they have no DRM. Copy-protected books are encrypted, and removing that is not something this site does. Books from Project Gutenberg, Standard Ebooks, Humble Bundle and most indie stores are DRM-free.