I want ePub to FB2. Because FB2 books are rendered with better readable fonts on my PockerBook reader. I have no problems using Calibre or PanDoc for this task

I want ePub to FB2. Because FB2 books are rendered with better readable fonts on my PockerBook reader. I have no problems using Calibre or PanDoc for this task though. Obviously the problem emerges when you want to do the job without installing anything.