What's the best free print to pdf for lecture notes?

I’m trying to save my lecture slides as PDFs so I can annotate them, but the free options I’ve tried either add watermarks or mess up the formatting. Anyone know a reliable free print-to-PDF that keeps the original look?

had the same thing last month with some slides. tbh i just use the microsoft print to pdf thats already in windows, it keeps the formatting pretty well and no watermarks. on mac its just save as pdf from the print menu. fwiw that worked for my lecture notes without messing them up.