I often save web pages on my Mac by going, file, print, save as PDF. There are several paid Apps that enable you to do this on an iPad but which ones best? I tried a free one but the images were'nt saved :-\
You can save any file to PDF on the IPAD as lone as you have AirPrint. If you have a windows pc get fingerprint it is $10 and you can print to any printer including PDF converters which you select as the printer. With fingerprint you will see every application that prints show up on the IPAD.
I have only tried to save PDFs on the PC with the help of some PDF managers, but never tried to save web pages to PDF on ipad. I don't think there are free tools can help with it. ButIhope you success. Good luck.