I'm developing some videos for my Introduction to Computing class, and as part of that I'll have lots and lots of slides of code with its output. I'd like to apply some syntax highlighting to emphasize reserved words, functions, variables, strings, and comments.
Doing that manually is going to take a couple eternities. Are there any automated tools online that will do this effectively? I've found a couple, but they either (a) focused exclusively on formatting, not highlighting, or (b) didn't result in copyable output.