Stamp Size vs Passport Size Photo: Exact Dimensions and When Each Is Asked
Ask a photo shop for a passport-size photo and you get one rectangle; ask for stamp-size and you get a smaller one; ask two different shops and you may get two different answers for the same word. Indian forms use both terms without ever defining them in millimetres.
This guide pins down the commonly cited dimensions for each, explains why the terms drift, and shows how to produce either size from a single good capture using a millimetre resizer that writes real print dimensions.
The commonly cited dimensions
Passport size in India is most widely cited as 3.5 x 4.5 cm (35 x 45 mm), the rectangle used by most exam portals, visas and ID applications. Indian passport applications themselves use a square 51 x 51 mm photo, which is its own spec.
Stamp size is looser: shops and forms commonly mean somewhere between 2.2 x 2.8 cm and 2.5 x 3.5 cm, with 2.5 x 3.0 cm appearing often for office records, ration and pension paperwork and college registers.
- Passport size: 35 x 45 mm rectangle, or 51 x 51 mm square for Indian passport submissions.
- Stamp size: roughly 22 x 28 mm to 25 x 35 mm depending on region and use.
- When a form states millimetres, that number overrides every shop convention.
Why the terms drift
Both names predate digital photography and described physical print sheets: a stamp-size print was the small rectangle pasted onto registers, a passport-size print the larger one pasted onto applications. Print sheets varied by studio, and the names survived without standardisation.
Digital portals had to pick numbers, so they published their own: which is why the same person needs three different crops for three different forms in one week.
The practical rule: treat the words as hints and the stated millimetres as the contract.
One capture, both sizes
- Capture square-on in even light against a plain wall, head and shoulders, at the highest resolution your phone offers.
- Crop once to head-and-shoulders with margin | keep this as the master file.
- Resize the master to 35 x 45 mm at 300 DPI for passport-size needs.
- Resize the same master to the stamp size your form states, again at 300 DPI.
- A millimetre resizer that stamps real DPI keeps both prints physically correct | pixel-only resizing produces photos that print at the wrong size.
Printing and file handoff
For physical prints, export at 300 DPI and let the shop or home printer honour the millimetre dimensions | a 35 x 45 mm photo at 300 DPI is 413 x 531 pixels.
For uploads, the same crop gets compressed into the portal KB window after resizing | size first, compress second, never the reverse.
Keep the master uncropped capture archived | next month is another form with another rectangle.
Try it free: Resize Image in MM tool | runs entirely in your browser, no uploads and no signup.