It scales automatically. You just have to make sure it meets the other requirements and that it is recognizably you. Just try it out and upload a picture and see how it works for you.
The 2x2 size floating around the internet is from the days you had to attach a picture to your ticket. Doesn't matter anymore - just make sure the resolution is high enough to fill the box when you upload and to print clearly and the picture fulfills the other requirements. I took an iPhone selfie against a white wall, cropped to head and shoulders and it worked great.
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Your Facebook/LinkedIn profile pic works well.
Anyone else have an idea???
I took an iPhone selfie against a white wall, cropped to head and shoulders and it worked great.