Saves the page you are actually looking at.
The most installed web-to-PDF extension has three hundred thousand users and 3.2 stars, and the reason is structural rather than sloppy. It is a front end for a rendering service: it sends the page address to a server, and that server loads the URL itself.
So the server gets whatever an anonymous visitor gets. For an order confirmation, a booking, an invoice in your webmail — a login screen. The vendor documentation lists signed-in pages as unsupported. It also explains the blank pages and missing content, since the server rendered something other than what you were looking at.
Turns one long sheet into real A4 pages, with each break moved to the quietest band nearby so it does not cut through a line of text. One purchase, no subscription.