If youre comparing how big is a 5×7 photo vs a postcard, most postcards are 4×6 inches, meaning the 5×7 is slightly larger. This gives you more room for visuals and text while still being compact. At Visuals Clipping, we suggest 5×7 prints for custom postcards or invitations when you want a little extra impact. The size adds a premium feel and makes your message stand out in a pile of mail.