How to upload pictures from google images to my iphone camera roll?

I want to put google images pictures on my phone so I can upload them to Facebook without saving them to the computer. How do I get them onto my camera roll? I've tried emailing them to myself but there's no option to save the image, when you tap it it just redirects you to the website where the picture originally came from.

Opens safari and view the image on the website, tap and hold and it will give you an option to automatically add it to the camera roll.

Copy through the usb port.

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