Launch the Safari app on your iPhone or iPad. Navigate to the web page that you wish to save as a multi-page PDF. Press the Home button and the Sleep/Wake button simultaneously to capture a ...

Note that the Save as PDF option can be accessed from the Print dialog window within a number of macOS apps, not just Preview. You can use it to create PDFs of web pages viewed in Safari, or Word ...

The program can open PDF documents consisting of a single page or multiple pages, and while it doesn't support multi-page PDF exports, it does let you export each page individually.

In order to make the merging process easier, name each file in a way that specifies its position in the multi-page PDF, for example, "page002," "page003," etc. Open PDFill.