"Passport size" sounds standard, but the exact dimensions differ by country and purpose — and getting them wrong means a rejected form or a reprint. This guide lists the real measurements in centimetres, inches and pixels, so you can set your photo correctly the first time.

Standard passport photo sizes

Here are the most common dimensions:

  • India passport & most exam forms: 3.5 × 4.5 cm — 1.38 × 1.77 inches — about 413 × 531 px at 300 DPI.
  • US visa, OCI, Green Card: 2 × 2 inch — 5.1 × 5.1 cm — 600 × 600 px (a square).
  • Schengen / UK visa: 3.5 × 4.5 cm, the same as India.
  • Stamp size (some forms): about 2 × 2.5 cm.

How centimetres convert to pixels

Pixels depend on the DPI (dots per inch). The formula is pixels = (cm ÷ 2.54) × DPI. At the standard 300 DPI, a 3.5×4.5 cm photo works out to roughly 413×531 px. If your form specifies a size in centimetres, our resize in cm tool does the maths and resizes your photo for you; if it gives pixels, use the Image Resizer.

The ratio and why it matters

A 3.5×4.5 cm photo has an aspect ratio of about 7:9 (0.78) — slightly taller than wide. A US 2×2 inch photo is a perfect 1:1 square. If you crop to the wrong ratio, your face ends up stretched or off-centre, which is a common rejection reason. The Passport Photo Maker keeps the correct ratio automatically.

Don't forget DPI and background

Many forms expect 300 DPI and a plain white background. If your file's DPI is wrong, set it with change image DPI. For the background, choose white in the passport maker, or remove a busy background first with our background tool. Always confirm the exact size, DPI and background colour in your official instructions.