When you compare the 4×6 photo to A4 size paper, the A4 size paper is almost double the size. The exact dimension of an A4 paper is 8 ¼ x 11 ¾ inches. So, you can print one 4×6 image on A4 paper and chop off the blank sides. You can also place two 4×6 photos and print them together on the A4 sheet.