Ghostscript. Depending on specific needs it may be much more turnkey than Pandoc, which isn’t actually doing much directly with things other than intermediating, iiuc. (LaTex) does the heavy lifting.

Ghost script is working with postscript natively and will likely manage idiosyncrasies of web content better. It’s got a decent ecosystem, command line, you can find gui’s if that’s your thing (no judgement, your lifestyle is none of my business).

Many other good tools mentioned here as well, but if your asking because you need more, or fine grained (near infinite) control over the pdf composition, there’s nothing OSS I can think of that approaches its capabilities.

https://ghostscript.com/