50.8×50.8 mm photo size

50.8×50.8 mm is 2.00×2.00 inches, or 600×600 pixels at 300 DPI.

This is a square format, required by 4 document types across 2 countries in our database. Each country and document below has its own exact rules beyond just the size — background colour, head position, and how recently we checked them — so open the specific one you need rather than relying on the size alone.