How Passport Photo Maker works
The Passport Photo tool crops an existing photo to the exact pixel dimensions of a passport, visa or ID format, 35x45mm for Schengen/EU/UK, 2x2in for the US, 50x70mm for Canada, 33x48mm for a China visa, or 51x51mm for India, at 150, 300 or 600 DPI. Drag to reposition and use the zoom slider to frame the shot inside a guide overlay that marks the head-height band each format expects, then export a single photo or a print sheet tiling as many copies as fit on a standard 10x15cm page.
The crop, the mm-to-pixel conversion and the sheet layout all run on a canvas element in your browser: the photo is never uploaded, resized on a server, or stored anywhere outside the current tab.