Passport photo size in pixels, mm and inches
Updated 2026-09-30
A pixel has no physical size until you choose a resolution. To turn millimetres into pixels, divide by 25.4 (millimetres per inch) and multiply by the DPI: pixels = mm ÷ 25.4 × DPI.
| Size | Millimetres | Pixels at 150 DPI | Pixels at 300 DPI | Pixels at 600 DPI |
|---|---|---|---|---|
| 35 × 45 mm | 35 × 45 mm | 207 × 266 | 413 × 531 | 827 × 1063 |
| 40 × 50 mm | 40 × 50 mm | 236 × 295 | 472 × 591 | 945 × 1181 |
| 50 × 70 mm | 50 × 70 mm | 295 × 413 | 591 × 827 | 1181 × 1654 |
| 51 × 51 mm (2 × 2 in) | 50.8 × 50.8 mm | 300 × 300 | 600 × 600 | 1200 × 1200 |
| 4 × 6 in print | 101.6 × 152.4 mm | 600 × 900 | 1200 × 1800 | 2400 × 3600 |
Which DPI should I use?
- 300 DPI is the usual choice for printing a photo. It is the resolution GetFormatted uses for millimetre-based presets.
- Online uploads care about pixel dimensions and file size, not DPI. A DPI tag inside the file does not change the pixels.
- Higher DPI makes a larger file with no extra detail if the original photo is small. You cannot add detail that was never captured.
Inches to millimetres
One inch is exactly 25.4 mm, so 2 inches is 50.8 mm. A 2 × 2 inch photo is 600 × 600 px at 300 DPI. Whether a particular country requires that size is a separate question: check the official page linked from its country guide.
Frequently asked questions
- How many pixels is 35 × 45 mm?
- At 300 DPI it is 413 × 531 pixels. At 150 DPI it is 207 × 266.
- How many pixels is 50 × 70 mm?
- At 300 DPI it is 591 × 827 pixels.
- Does changing the DPI change the photo?
- Only the printed size. Resampling to more pixels does not add detail, and a DPI tag alone does not change how many pixels the file contains.