What ICAO means for your passport photo

ICAO is the International Civil Aviation Organization, the United Nations agency that makes air travel work across borders. Its document 9303, "Machine Readable Travel Documents", is the specification every modern passport is built on — the layout of the data page, the machine-readable lines at the bottom, the chip, and the portrait.

If you have ever wondered why a photo for a Turkish passport looks so much like a photo for a German one, this is why.

What Doc 9303 fixes about the portrait

The standard is written for machines as much as for officials: the portrait has to be comparable, by software, against the person standing at the border. That drives every rule in it.

• The head is shown full face, square to the camera, both eye areas visible.
• The head fills roughly 70 to 80 percent of the image height, measured from the chin to the top of the crown.
• The expression is neutral with the mouth closed, and the eyes are open and unobstructed.
• The background is plain and uniform, without pattern, objects or other people.
• The lighting is even, with no shadow on the face and none on the background.
• The image is in focus, in natural colour, without red eye and without retouching.
• The photograph is recent, so that it still looks like you.

What the standard does not fix is the paper. The familiar 35×45 mm print is a convention built on top of it, not a line in Doc 9303.

Why two countries still disagree

Doc 9303 leaves room, and national authorities use it. The United States asks for a square 2×2 inch photo with the head between 25 and 35 mm — closer to 50–69 percent of the image height than to 80. Some countries want a white background, others a light grey or off-white one. Glasses are forbidden outright in some places and merely restricted in others. Head coverings worn for religious reasons are accepted nearly everywhere, provided the face is visible from the bottom of the chin to the top of the forehead.

So "ICAO-compliant" on its own is not a guarantee that a photo will be accepted. It means the photo follows the family of rules your document's own specification belongs to.

How to read your document's own rules

1. Open your document's page. Start from the document catalogue and choose the exact document — a passport and an identity card from the same country often differ.
2. Read the facts box. Size in millimetres, head height, eye line, background colour and file limits, each stated as one line with its unit.
3. Check the date and the source. Every verified page carries the date it was last checked against the issuing authority and a link to that authority's own page.
4. Follow the authority link when the stakes are high. A renewal by post and a first passport can be treated differently by the same office.
5. Let the tool apply it. Choose that document in the tool and the rules become the crop, the background colour and the checks — you do not measure anything yourself.