https://takeout.google.com/ https://takeout.google.com/ is exactly what you want. Deselect all, check "Google Photos", click Next, chose your archive format, co

https://takeout.google.com/ https://takeout.google.com/ is exactly what you want. Deselect all, check "Google Photos", click Next, chose your archive format, confirm. It'll take some time but at the end of the process, you got a nice zip with all your Photos in original quality.