[PortMan]

First of all, I'm extremely new to both Calibre and the epub format, so please be patient with my ignorance. Also, I tried searching for this in the forums, but didn't find it. (Likely because I didn't know enough to know what to search for.)

I have some EPubs that have a blank line in between each and every paragraph. I do not like this.

How can I fix these epubs so that I don't have all of this useless white space on my tiny reader screen? Can I do it with Calibre? Do I need to install something like Sigil to do it?

Is this something I can do by extracting the contents of the epub and editing with a text editor?

Thank you.