Almost every document photo spec on earth is a variation on one document: ICAO Doc 9303, the standard for machine-readable travel documents. Understanding it explains why spec sheets rhyme — and where they deliberately don’t.

The baseline portrait

The Doc 9303 portrait guidance asks for a photo that a machine can measure: frontal pose, face centred, eyes open and level, neutral expression, mouth closed. The canonical frame is 35×45 mm with the head filling about 70–80% of the height (≈32–36 mm crown→chin), on a plain light background, printed on photo-quality paper. No retouching, no filters, nothing that changes the face’s geometry.

That template is why 35×45 mm shows up from Tokyo to Berlin: it isn’t a coincidence, it’s a standard.

Who follows it — and who doesn’t

Follows the ICAO family	Overrides it
Schengen visa — 35×45 mm, 32–36 mm	United States — 2×2 in square, 50–69% head
UK — 45×35 mm, 29–34 mm	Canada — 50×70 mm, 44–51% head
Germany, France (national passports)	China — 33×48 mm, 58–69% head
Japan — 35×45 mm, tighter 34±2 mm	India — 4.5×3.5 cm print; its ICAO guideline wants an 80–85% face
Australia — 35×45 mm inside a 35–40×45–50 window	Brazil — 5×7 cm under-5s; consulates publish 2×2 in
New Zealand — 35×45 mm	India e-visa — square digital upload

India is the interesting case. Its printed passport photo, 4.5 × 3.5 cm, has had the ICAO-family 35×45 mm shape since at least the 2020 Passport Seva booklet, and from September 2025 its embassies and consulates began moving passport applicants, mission by mission, to photos that follow Passport Seva’s “ICAO compliant” guideline (in Dubai the upload was optional at launch) — yet that guideline asks for a face covering 80–85% of the photo, more than the 70–80% usually quoted for this standard. “ICAO compliant” and “meets the national spec” are close cousins, not synonyms.

China shows why portrait specs and upload rules need separate checks: the Macau China visa application centre’s guide gives a COVA window of 354–420 × 472–560 px, while some current online-form FAQs cap uploads at 354×472 px. Follow the limit shown by the centre handling your application.

The parts every spec borrows

Beyond size, the 9303 checklist is the source of the soft rules you see everywhere: evenly lit face with no shadows, no head coverings except religious/medical (face fully visible), no glasses or glare obscuring the eyes, no red-eye, natural skin tone, no digitally altered features. When a national sheet says nothing about expression or lighting, the ICAO defaults are still what the officer applies.

Why it exists at all

Machine-readable zones and face-matching gates need consistent input. A photo that’s too dark, tilted, or framed loosely doesn’t just annoy an officer — it fails the biometric check the border runs. The spec’s fussiness is the price of automated borders.

Sources

SourceICAO — icao.int, Doc 9303 machine-readable travel documents (portrait guidance as reflected in national specs; verified September 2026). Doc 9303 itself is published in parts; the portrait annex is what national photo rules quote. India: Passport Seva's ICAO photo guidelines and instruction booklet (re-checked 1 October 2026).

Related: reading spec sheets · Schengen visa photo · India’s photo rules by channel.

Frequently asked questions

What is ICAO Doc 9303?

The International Civil Aviation Organization's standard for machine-readable travel documents — passports, visas, ID cards. Part of it specifies the portrait: frontal pose, face filling roughly 70–80% of a 35×45 mm frame, plain light background, neutral expression, no retouching. It's the template most national photo specs are built on.

If my photo meets ICAO spec, does it work everywhere?

Usually but not automatically. ICAO is a baseline countries override: the US stayed square (2×2 in), Canada kept 50×70 mm, China uses 33×48 mm, and the ICAO guideline Indian missions abroad apply asks for an 80–85% face. A 35×45 mm ICAO-compliant photo is the right starting point for most of the world — then check the national band.

Why do so many spec sheets say 'ICAO compliant'?

Because border gates read faces automatically now. The portrait rules exist so a camera can find and measure a face: frontal, centred, evenly lit, unobstructed. 'ICAO compliant' signals the photo will parse in machine reading — the details beyond that are national choice.

Where do the 35×45 mm and 70–80% numbers come from?

The portrait annex of Doc 9303: a 35×45 mm frame with the face occupying about 70–80% of the height — enough cheek and forehead detail for biometric matching. Schengen visa guidance and most European passport rules quote the same numbers almost verbatim.