For converting we will use tool calibre. Install it on mac via

brew install calibre

Then you can use ebook-convert CLI to do the work. For example to convert epub format to pdf.

ebook-convert book.epub book.pdf

And PDF you can send to Kindle via Send to Kindle mac application.

links

• calibre
• Send to Kindle
• ebook libraries: z-lib.org, 1lib.cz