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: Learning from Failure: I think there is a place for parties with views I find insane. (posted 2024-11-28 at 12:41:49). 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..