How to convert the entire electronic library to fb2, epub, mobi?

Question

Electronic books

There is a library of 150 books. Different books in different formats (pdf, fb2, epub). Each of the books needs to be converted to fb2, epub, mobi. I tried caliber, but there is a problem with Russian names - they are transliterated into English

Answer 1

I tried caliber, but there is a problem with Russian names - they are transliterated into English

If you are talking about the file name when saving to disk via Save to disk

Answer 2

Try this service https://convertio.co/en/