The printed size
US passport photos are 2 × 2 inches (51 × 51 mm), and the head — from the bottom of the chin to the top of the head — must measure between 1 and 1 3/8 inches (25–35 mm). In a 600 × 600 file that is about 300 to 410 pixels.
Printing it
Print the JPEG at exactly 2 × 2 inches, on matte or glossy photo paper, without scaling to fit the page. Most photo kiosks and print shops have a “passport” or “actual size” option. Choose 600 DPI if the printer supports it.
Online applications
Online forms often have their own pixel and KB limits. If yours does, paste the rules into “What does the website require?” and Zekoya adjusts the settings. For visa forms, use the US visa photo page.
Questions
Are 2×2 photos the same for visas and passports?
The printed size is the same. For the online visa form, use the US visa photo template (600–1200 px, ≤240 KB).
Can I print several on one sheet?
Zekoya makes one photo per file. Most print services let you place several copies on a 4 × 6 inch sheet.