How the Vietnam passport photo process works
A Vietnam passport photo is 4×6 cm (40×60 mm) on a plain white background — taller than the common 35×45 mm format used elsewhere. At 300 dpi that works out to 472×708 px. You take the photo to spec and submit it with your application to the Vietnam passport authority, either as a printed copy or, where the application is online, as an uploaded image. Note that the Vietnam e-Visa uses a separate square (2×2 inch) photo, so confirm which one your application needs first. Snapfora crops and sizes to 40×60 mm locally and flags head height and tilt, so you can fix problems and reshoot before you submit — not after a rejection.