5
In Calibre You can select several books at once, and hit convert. It is an old feature, described on the official blog:
Bulk convert: Calibre allows you to convert books in bulk. You can
select a set of books, all of which may or may not be in the same
format, and convert them all in bulk to a different format. So say you
have a kindle and you have ...
Only top voted, non community-wiki answers of a minimum length are eligible
