Vietnam Passport Photo Size

In short A Vietnam passport photo is 40 × 60 mm with the head measuring 30 to 42 mm from crown to chin, on a plain white background. That head range works out at 50 to 70 per cent of the image height, which is outside the 70 to 80 per cent ICAO Doc 9303 asks for, and deliberately so. That is precisely why a photo cut to another country's requirements is likely to be refused here even when the paper size matches. Vietnam's 40 × 60 mm is the 4 × 6 cm format used across much of its paperwork, so the same photo size covers a great deal more than the passport. In pixels, the print needs 473 × 709 at 300 dpi, which is the normal minimum for printing, and 945 × 1418 at 600 dpi, which is what many online applications ask for. Note that dpi is not a property of a file at all — it is the pixel count divided by the print size, so quoting megapixels answers a different question. What none of this settles is whether a particular photograph will be accepted: size, head height and background are the measurable part, while expression, lighting, shadow on the background, glare on spectacles and hair across the face are judged by a person, and any of them can fail a photo that is correct to the millimetre.