Passport photo size calculator (mm → pixels at any DPI)
Exact math: pixels = (mm ÷ 25.4) × DPI. Type a physical size, choose your DPI (200/300/600 are the common ones), and get pixel dimensions accurate to ±1 pixel. Includes the entire profiles database — pick "US passport" to instantly load 51×51 mm at 300 DPI = 602×602 pixels. Useful when your editor (Photoshop, GIMP, Affinity) asks for pixel input and you only have the mm spec.
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How it works
- 1Type the physical size in mm or inches, or pick a country/document preset.
- 2Choose your DPI (typically 300; 600 for ICAO ePassport chip image).
- 3Copy the resulting pixel dimensions into your editor's canvas size.
Frequently asked
What DPI should I use for a passport photo?
300 DPI is the universal standard — every printer can handle it, every authority accepts it. 600 DPI is sometimes specified for ICAO ePassports (the chip-stored image). 200 DPI is the absolute minimum and acceptable only for digital-only submissions.
Why does the same photo print smaller on one printer than another?
Different printer drivers default to different "fit to page" settings. Disable any auto-scaling and print at "actual size" (100%). If the file has a wrong DPI tag embedded, the driver may reinterpret pixel-mm. This calculator outputs the exact pixel count for the printer to render at 100%.
What's the difference between DPI and PPI?
PPI (pixels per inch) is a property of digital images — how many pixels per inch when displayed at native size. DPI (dots per inch) is a property of printers — how many ink dots per inch of paper. For ID photo purposes they're used interchangeably; what matters is that your file declares the right value.
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