United States — Passport photo specification
Photo size: 51×51 mm (600×600 px at 300 DPI)
Background: White or off-white
Requirements:
Size: 2×2 inches (51×51 mm)
Printed at 300 DPI minimum
Plain white or off-white background
Neutral facial expression, mouth closed
Both eyes open and clearly visible
No glasses (since 2016)
Head centered, facing camera directly
Face must cover 70 - 80% of the frame
Taken within the last 6 months