I had 2 - three hundred plus page epub files I wanted converted to PDF. Submitted them to Zamzar via drag and drop and all I had to give them was my email address. I didn't have to register or anything like that. Sure, they try to sell a service for those with many files needed to be converted regularly, but nothing wrong with that. In the meantime, my files were converted in a minute or two and I received an email for each file submitted, with some advertising and a link to my converted files. It was fast and free, just as they say. If I had many files to convert, I would sign up for one of their pay services. Use them without worry.
Thanks for your review, David! We're glad you found our service easy and quick to use, and we're glad we could help. Thanks, the Zamzar team.