ID Photo Size and Pixel Guide

The useful detail is in the edge cases: old photos, difficult lighting, family batches, strict file limits, special applicants and application routes that do not use the same photo rules.

The measurement first

Millimetres and inches describe physical output; pixels describe digital dimensions; DPI connects pixels to physical size during printing. If an authority already states the required pixel dimensions, use them directly. If you are building a print file from millimetres, the basic relationship is pixels = millimetres × DPI ÷ 25.4.

Where calculations stop being enough

A mathematically correct file can still fail because the face is the wrong size inside the frame, the background is unsuitable, the compression introduces visible artefacts, or the application expects a different file type. Finish every conversion with a visual and application-specific check.

One final question

Does this exact file match the exact application? If the answer is yes, save it and move on. If the answer is “probably,” go back to the authority page before submitting.

Indian identity documents are not one single photo standard

India is a good example of why a generic “ID photo size” chart can mislead. PAN Form 49A specifies two recent colour photographs of 3.5 × 2.5 cm with a white background for the paper-form route. ECI Form 6 uses a recent unsigned 4.5 × 3.5 cm colour photo with a white background. Parivahan Form 4 refers to three recent passport-size photographs, with a note about laminated-card use. UIDAI treats the facial photograph as biometric information captured or updated at an enrolment centre. These are different workflows, even though all four are casually described as “ID photos.”

That difference is exactly why FastIDPhoto should be used as a preparation tool rather than a universal authority. Choose the document first, then build its output.

A note for this exact search

For this particular topic, save the final version with the destination and date in the filename. That makes a second application easier to prepare without guessing which export you used first.