In Safari, use Share → Print, open the print preview as a PDF, then use Share again to save it to Files.
Step by Step
- Open the webpage in Safari.
- Select Share.
- Choose Print.
- Open/expand the print preview to view it as a PDF.
- Select Share from the PDF preview.
- Choose Save to Files and select a folder.
If That Doesn't Work
- Some webpages format differently when printed.
- Reader view can sometimes create a cleaner result before printing a text-heavy page.