When submitting digitally, should the image file already be 2x2 inches, or is the Passport photo online service expected to handle the conversion from pixel dimensions to the 2x2 print standard for the USA?

The digital file must be submitted in the required pixel dimensions (600x600 to 1200x1200) for the USA. The passport photo online service converts your compliant digital file into the exact 2x2 inch print size required if you need a physical copy for submission. Handle both digital and print size conversions easily: https://passport-photos.net/.