You can do this in several ways. 
The one I prefer is going to https://www.sejda.com/html-to-pdf and input
the url of the webpage you want to convert to html and it will automatically do that for you

You could also go to a webpage, right click on it and choose 'save as' option. Once you save it
in either .mhtml or .html or .htm format, there's alot of websites that convert these webpages
to pdf

Hope this helps