What size is a Canada visitor visa photo?
IRCC asks for a frame of at least 35 x 45 mm (1 3/8 x 1 3/4 inches), taller than it is wide. Inside it, the head measures 31 to 36 mm from chin to crown, with the face in the middle and the top of the shoulders showing.
The crown is the top of the skull. When hair or a religious head covering hides it, IRCC measures to where the top of the skull would be, so a tall hairstyle does not count toward the head size.
Source: canada.ca
