How to print passport size photo in a4 paper?

First, you'll want to resize your digital photo. A standard US passport photo is 2x2 inches. The easiest way is using a program like Microsoft Word. Just set your page size to A4. Then, insert your picture and format it to be exactly 2 inches high and 2 inches wide. You can then copy and paste this image multiple times, leaving a bit of space for cutting. When you're ready to print, make sure your printer settings are set to A4 paper and "Actual Size" or 100% scale. For best results, use glossy photo paper.