May 29, 2026 · Photo Specifications
Passport Photo Head Size Guide 2026 – ICAO, US, and UK Face Height Requirements
Head size is one of the most common reasons passport photos are rejected. International standards define precise requirements for how large the face must appear within the photo frame — measured as the distance from chin to crown. This guide explains the requirements for ICAO, US, UK, and Canadian formats, how to measure your head size digitally or with a ruler, and how to correct the most common head-size errors.
Key rule for ICAO photos
For a standard 35×45mm ICAO passport photo, the face height (chin to crown of head) must be 32–36mm — approximately 70–80% of the 45mm photo height. Eyes should be 28–34mm from the bottom of the photo.
Head Size Requirements by Country Format
| Format | Photo size | Face height | Face ratio | Eye position |
|---|---|---|---|---|
| ICAO standard (most EU, Schengen, world) | 35×45mm (W×H) | 32–36mm | ~71–80% of height | 28–34mm from bottom |
| US passport | 51×51mm (2×2 in) | 25–35mm (1–1.375 in) | ~50–69% of height | 28–35mm from bottom |
| UK (HMPO landscape portrait) | 45×35mm (W×H) | 29–34mm | ~83–97% of height | No explicit rule — fill frame |
| Canada (IRCC) | 50×70mm (W×H) | 31–36mm | ~44–51% of height | Eyes in upper half of photo |
ICAO Standard: How Head Size Is Defined
ICAO Doc 9303 defines face height as the distance from the bottom of the chin to the top of the head — not including hair. This is sometimes called the “face height” or “head height” measurement.
For the standard ICAO 35×45mm portrait photo:
- Face height: 32mm to 36mm (chin to crown of head, excluding hair)
- As a ratio: approximately 70–80% of the total 45mm photo height
- Eye position: approximately 28mm to 34mm measured from the bottom of the photo
- Head centring: the face must be horizontally centred in the frame
- Crown clearance: a small gap between the top of the head and the top of the photo frame (approximately 2–4mm)
The 70–80% face-to-photo ratio is the most useful quick check. If your face occupies less than 70% of the photo height, the head is too small. If it occupies more than 80% (or the crown is clipped), the head is too large.
US Passport Photo: Head Size in a 2×2 Inch Square
The US passport photo format is 51×51mm (2×2 inches square). This is different from the ICAO portrait format used by most other countries. The head size rules are set by the US Department of State:
- Face height: 25mm to 35mm (1 inch to 1.375 inches)
- Eye position: 28mm to 35mm (1.125 to 1.375 inches) from the bottom edge of the photo
- Head must not be tilted: face must be directly facing the camera
The US rule specifies a range rather than a single target. A face height of 31mm (approximately 1.22 inches) is near the middle of the acceptable range and typically results in a well-proportioned photo.
UK Passport Photo: Head Size in the HMPO Format
The UK HMPO passport photo is 45×35mm in landscape portrait orientation (wider than it is tall). The face height requirements are:
- Face height: 29mm to 34mm (chin to crown)
- Photo height: 35mm total — so the face occupies 83–97% of the vertical dimension
- Head must nearly fill the frame from chin to crown — this is a tighter crop than ICAO
UK photos allow only a very small gap between the top of the head and the top of the photo frame. This tighter crop is one reason UK passport photos cannot simply be substituted for ICAO-format photos — the framing is different.
How to Measure Head Size in a Digital Photo
If you are preparing a digital passport photo, you can verify head size using an image editor. The method depends on the resolution (DPI) of your image.
- Open the image in your image editor and check the document DPI/resolution setting.
- Use the ruler or measurement tool to draw a line from the bottom of the chin to the top of the head (crown, not hair).
- Convert the pixel measurement to millimetres using the formula: mm = pixels ÷ (DPI ÷ 25.4).
- Compare the result to the required face height range for your target country.
Alternatively, use the ratio method: measure the face height in pixels and the total photo height in pixels. The ratio (face ÷ total) should be 0.71–0.80 for ICAO standard.
Digital Pixel Equivalents at 300 DPI and 600 DPI
| Dimension | 300 DPI | 600 DPI |
|---|---|---|
| 35mm (ICAO width) | 413 px | 827 px |
| 45mm (ICAO height) | 531 px | 1063 px |
| 51mm (US side) | 602 px | 1204 px |
| 50mm (Canada width) | 591 px | 1181 px |
| 70mm (Canada height) | 827 px | 1654 px |
Formula: pixels = mm × (DPI ÷ 25.4). Passport photo printers typically require at minimum 300 DPI. 600 DPI is preferred for sharper prints.
Measuring Head Size on a Printed Passport Photo
To verify head size on a printed photo:
- Use a digital caliper for precision, or a fine ruler with millimetre markings.
- Measure from the bottom of the chin to the top of the head (crown, not top of hair).
- For ICAO photos, the result should be 32–36mm. For UK photos, 29–34mm. For US photos, convert to inches: 1–1.375 inches (25–35mm).
- Measure the overall photo height as a cross-check (should be 45mm for ICAO, 35mm for UK, 51mm for US).
Common Head Size Errors and How to Fix Them
Head too small (face below 70% of photo height)
The subject was too far from the camera. Retake the photo by moving closer, or use a longer focal length. Do not zoom in digitally after taking the photo — retake with correct framing.
Head too large (crown clipped or face above 80% ratio)
The subject was too close or the photo was cropped too tightly. Step back from the camera or re-crop with more space above the crown.
Head tilted to one side
Ask the subject to face directly forward and align their eyes horizontally. Use a mirror or camera preview to check before shooting.
Face not centred horizontally
The subject should be positioned in the centre of the frame. Use camera grid lines to centre the face between the left and right edges.
Hair adds false height (crown measurement taken to top of hair, not head)
Measure to the crown of the skull, not the top of hair. Very large hairstyles can cause the face to appear smaller relative to the photo if the chin-to-crown measurement is taken correctly — the photo may need to be retaken with the subject further from the camera.
Frequently Asked Questions
What is the correct head size for an ICAO passport photo?
For an ICAO standard 35×45mm passport photo, the face height from chin to crown must be 32mm to 36mm — approximately 70–80% of the 45mm photo height. Eye position should be approximately 28mm to 34mm from the bottom of the photo.
What is the correct head size for a US passport photo?
For a US passport photo (51×51mm / 2×2 inches), face height from chin to crown must be 25mm to 35mm (1 to 1.375 inches). Eyes should be 28mm to 35mm from the bottom of the photo.
What is the correct head size for a UK passport photo?
For a UK HMPO passport photo (45×35mm landscape), face height from chin to crown must be 29mm to 34mm. The head fills nearly the full vertical dimension of the 35mm photo height.
How do I measure head size in a digital passport photo?
Open the image in an image editor at 100% zoom. At 600 DPI, 1mm equals approximately 23.6 pixels. Measure chin to crown in pixels and convert: mm = pixels ÷ (DPI ÷ 25.4). For ICAO the result should be 32–36mm.
My passport photo was rejected because my head was too small — how do I fix this?
Move closer to the camera when retaking the photo so the face fills more of the frame. Aim for 70–80% face height for ICAO photos. Do not crop the top of the head — the crown must remain visible.
What pixels equal 35mm and 45mm at 600 DPI?
At 600 DPI: 35mm = 827 pixels and 45mm = 1063 pixels. At 300 DPI: 35mm = 413 pixels and 45mm = 531 pixels. For the US 51×51mm format at 600 DPI: 51mm = 1204 pixels.
Head size specifications are based on ICAO Doc 9303, the US Department of State photo requirements, and HMPO guidelines. Always verify current requirements with the issuing authority before submitting your application.
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