Open Safari (or another app; see below) and take one screenshot of any screen, then immediately tap on the thumbnail preview. Above the screenshot will be two options: "Screen" and "Full Page".
Selecting "Full Page" will turn the entire document you are viewing into a PDF file that you can then save and manipulate in the Files app.
Note 1: The feature works in Safari, Pages, Numbers, Keynote, Mail, or Apple Maps. Note 2: Works on iPhone and iPad, iOS 13 and later.
I usually write a blog post about once a week. The latest post can be viewed here: Garbage: Democracy dies in darkness, especially when it is buried in garbage! (posted 2024-11-01 at 12:31:14). I do podcasts too!. You can listen to my latest podcast, here: OJB's Podcast 2024-08-22 Stirring Up Trouble: Let's just get every view out there and fairly debate them..