what size is a passport photo

The correct size of a passport photo is 2 x 2 inches (51 x 51 mm) . The photo should have a square aspect ratio, with the height equal to the width. The minimum acceptable dimensions are 600 x 600 pixels, and the maximum acceptable dimensions are 1200 x 1200 pixels. The image must be in color (24 bits per pixel) in sRGB color space, and in JPEG file format. The file size must be less than or equal to 240 kB (kilobytes) .