You can choose between a horizontal or vertical stamp.Size of a horizontal Non-Priority stamp:Stamp: 72 mm x 31.4 mmPhoto: 52 mm x 28 mmSize of a vertical Non-Priority stamp:Stamp: 44.5 mm x 31.4 mmPhoto: 25 mm x 28 mmSize of a horizontal Priority stamp:Stamp: 72 mm x 31.4 mmPhoto: 48 mm x 27 mmSize of a vertical Priority stamp:Stamp: 44.5 mm x 31.4 mmPhoto: 20.5 mm x 27 mm