How to export Linux manpages to PDF
All you need is the groff package. Install it via the repositories of your distribution (on Arch Linux it’s part of the base-devel pack) and then use this command:
$ man -Tpdf package > output.pdf
For example, if I want rsync’s manpage:
$ man -Tpdf rsync > rsync.pdf
In actuality you can export to other formats as well and not only PDF. For example, if I wanted to use ODT instead:
$ man -Tpdf rsync > rsync.odt
Via: Stack Exchange