Passport photo online validation for head-to-chin size in the USA

[TrevorPlay]

What exact head size requirements must be met (chin to crown) for a USA passport photo, and how does an automated Passport photo online tool ensure this specific proportion is correct?

[Lololoshka]

For the USA, the head (chin to crown) must measure between 1 and 1 3/8 inches (25–35 mm). An automated passport photo online tool uses advanced facial recognition algorithms to measure this proportion precisely and crops the image to ensure the head occupies the required 50-69% of the photo's total area. Visit passport-photos.net/ for perfectly proportioned photos.