Capture a Screenshot of an Entire Page, Save as PDF
You can capture the full length of a webpage and then save it as a PDF file that you can access in the Files app.
Take a screen capture, tap the thumbnail in the lower-left corner, then look for the options “Screen” and “Full Page” at the top to choose whether you want just the contents of the screen or an entire page.
This screen capture option works in Safari, Pages, Numbers, Keynote, Mail, or Apple Maps.