Outer size
The finished image is square. When printed or submitted digitally, the crop should preserve that square format without stretching the face.
US passport photo dimensions
The outer photo is only the first constraint. Your head and eye line also need to land inside the correct area of the 2x2 frame, which is why a simple square crop can still fail.
Resize my passport photoThe finished image is square. When printed or submitted digitally, the crop should preserve that square format without stretching the face.
The head is measured from the bottom of the chin to the top of the head, including hair. Too small or too large can make an otherwise sharp photo fail.
The eyes sit in a vertical band measured from the bottom of the image. This helps keep the face naturally centered in the final crop.