Head size is the single most misunderstood passport-photo rule — and one of the most common reasons a photo gets bounced. Governments don't just want "a clear face"; they want your head to occupy a precise fraction of the frame, measured in millimeters from the bottom of your chin to the top of your head (the crown). Get it wrong by a few millimeters and the application is rejected, even if the lighting and background are perfect.
This guide gives you the exact chin-to-crown measurement for the four most-requested specs, with the official numbers. If you'd rather not measure with a ruler, Snapassport checks head height automatically against the rules for your specific document.
What does "head size" actually mean on a passport photo?
Head size is the vertical distance from the bottom of your chin to the top of your head (including hair), expressed either as an absolute measurement in millimeters or as a percentage of the total photo height. It is not the same as zoom or how close you stand to the camera — two photos at the same distance can still fail if they're cropped differently. Every authority specifies both a minimum and a maximum, so your head must fall inside a narrow band: too small and your features can't be verified, too large and the crop cuts off your hair or chin.
What is the head size for a US passport photo?
For a US passport, the photo must be 2 x 2 inches (51 x 51 mm) and your head — measured from the bottom of the chin to the top of the head — must be between 1 inch and 1 3/8 inches (25 mm to 35 mm). That works out to roughly 50%–69% of the photo's height. The U.S. Department of State publishes a composition template showing exactly where the chin and crown lines should sit. See the US passport photo guide for the full crop, and the official rule at U.S. Department of State — Passport Photos.
What is the head size for a UK passport photo?
The UK uses a smaller, rectangular 45 x 35 mm print, and the head (crown to chin) must measure between 29 mm and 34 mm. UK rules also forbid head tilt — your face must be straight to the camera with a neutral expression and both eyes open. The digital-photo path measured by an app uses the same proportions. Full details are in our UK passport photo guide and the official GOV.UK — Get a passport photo.
What is the head size for a Canadian passport photo?
Canada's spec is the strictest on frame size: the photo must be 50 x 70 mm, and the face — chin to the natural top of the head — must be between 31 mm and 36 mm. Because the print is taller than the US or UK formats, there is more empty space above the head, which trips up people who crop too tightly. The numbers come directly from IRCC — Passport photo requirements; see the Canada passport photo guide for the matching layout.
What is the head size for a Schengen visa photo?
Schengen visa photos follow the ICAO standard: a 35 x 45 mm image where the head (chin to crown) measures 32 mm to 36 mm, or about 70%–80% of the photo height. This is noticeably larger than the US head ratio, so an American-style 2x2 photo will usually fail a Schengen application — the face looks too small in the frame. The proportions trace back to ICAO — Photograph Guidelines (Doc 9303 / ISO-IEC 19794-5). Our Schengen visa photo guide lists the head-ratio and background rules together.
Why does head size get so many photos rejected?
Because it's invisible to the eye. A photo can look great on your phone yet still sit a few millimeters outside the band once it's printed or cropped to the official aspect ratio. The most common mistakes are standing too close (head too large, crop clips the hair) or using a wide selfie (head too small). Tilting your head or slouching also changes the apparent chin-to-crown distance. Instead of guessing, upload your photo and let Snapassport measure the head ratio against your exact document spec and flag it before you pay a government fee.
Quick reference: head size by document
- US passport — photo 51 x 51 mm, head 25–35 mm (chin to crown)
- UK passport — photo 45 x 35 mm, head 29–34 mm
- Canada passport — photo 50 x 70 mm, head 31–36 mm
- Schengen visa — photo 35 x 45 mm, head 32–36 mm (~70–80% of height)
Always confirm against the official source for your document, since specs are updated periodically. When in doubt, the measurement that matters is chin-to-crown — get that inside the band and the rest of the crop usually follows.