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PDFImageTools

Photo Tools

Application forms are unusually specific about photographs — exact millimetres, exact file sizes, exact backgrounds. These tools hit those numbers precisely, and show you the numbers as you go.

11 tools · all free · no sign-up

Physical size, pixel size, and why forms care about both

An ordinary image tool thinks in pixels. Official photo requirements are usually written in millimetres — 35 × 45 mm for most passports, 2 × 2 inches for the US — and often add a file size cap in KB on top. Those two constraints pull in opposite directions, which is what makes these forms frustrating to satisfy by hand.

The tools here work in the physical units the specification is written in and convert to pixels at a print resolution, so the number you type is the number the form asked for. The passport tool holds the aspect ratio and the head-height proportions; the signature tool hits an exact pixel size and an exact file size at the same time; the print sheet tool tiles finished photos onto A4 or 4 × 6 so a print shop produces the right physical dimensions.

One thing worth knowing before you start: begin from the largest original you have. Every one of these operations either crops or shrinks, and none of them can add detail that the camera did not capture. A photo that is already 400 pixels wide cannot become a sharp 35 × 45 mm print.