It is also possible to preview CPAN HTML using search.cpan.org/pod2html service, that allows uploading .pm files.
If you want to get a glimpse of what your POD will look like on CPAN before you upload your module to CPAN, then this is for you. It is as close as you're going to get to the real thing. It is an essential tool for developing CPAN modules.
The command-line utility script is a great convenience because it is so simple to use.