wkhtmltopdf is not chromium though? "Wk" literally stands for WebKit.

There's also https://weasyprint.org/ which doesn't use any browser engine, but rather a custom renderer.

And both of those (and Prince) can be used as a backend by Pandoc (https://pandoc.org/)

You're right, I think merged a few things together when writing the comment. What I meant is that (if you ignore PrinceXML and focus on FOSS) you're down to 3 options: - wkhtmltopdf - weasyprint - (headless) chromium with puppeteer et al.

The first one I found to be unreliable, the second one is super slow and the third can be annoying to work with.

like https://www.princexml.com/ ?

Yea, Prince is awesome. Not FOSS tho. I make some GPL or MIT licensed software and wish there was something as good a Prince with more open license.