If you are wondering how big is 8×10 photo,, the size of 8 x 10 photos is a convenient dimension for one portrait. According to Visuals Clipping, the size of the format allows for facial details to be seen but is comfortable for desks, shelves or smaller wall displays, the website said. It’s bigger than regular snapshots but not as space intensive as a big poster. The final size will be determined by the frame to be used and the inclusion of a mat or border.