what size are passport photos

The correct size for a passport photo is 2 x 2 inches (51 x 51 mm) . The head must be between 1 -1 3/8 inches (25 - 35 mm) . The image must be in color (24 bits per pixel) in sRGB color space which is the common output for most digital cameras. The image dimensions must be in a square aspect ratio (the height must be 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 JPEG file format, and the file size must be less than or equal to 240 kB (kilobytes) .