What Is a Biometric Photo and the ICAO Doc 9303 Standard: A Complete Guide (2026)
In short. A biometric photo is a facial image taken to the ICAO Doc 9303 standard and suitable for automatic recognition at the border: the head occupies 70-80% of the frame's height, the eyes sit within a defined vertical zone (roughly the middle of the upper half of the image), the facial expression is neutral, the background is a plain light colour, the lighting is even, and the image is sharp and free of obstructions.
- The head (from chin to crown) must occupy 70-80% of the height of the printed photo — for the 35x45 mm format that is approximately 31.5-36 mm
- The eye line sits within a defined vertical zone (roughly 0.5-0.7 of the image height measured from the bottom), with the face centred horizontally
- The requirements exist not for aesthetics but for machine recognition at eGates: the recommended distance between the eyes is 120+ pixels, with a minimum of 90 pixels under ISO/IEC 39794-5
- The modern ISO/IEC 39794-5 standard replaces the older 19794-5: passport-reading systems must support it from 2026, and passport issuers must fully transition by 2030
- Almost every country requires a biometric photo because the Schengen area runs the EES system (fully operational on 10 April 2026), which captures a facial image at the border
In brief: what a biometric photo is
A biometric photo is not a “flattering photo” but a technically standardised facial image suitable for automatic recognition. All of its requirements are set out in ICAO Doc 9303 (the International Civil Aviation Organization's standard for machine-readable travel documents) and detailed further in the ISO/IEC standards.
7 key requirements of ICAO Doc 9303
| Parameter | Requirement |
|---|---|
| Head size | 70-80% of the frame height (≈31.5-36 mm on a 35x45 mm photo) |
| Eye position | eye line within a defined vertical zone (≈0.5-0.7 of the image height) |
| Facial expression | neutral, mouth closed, no smile |
| Eyes | open, clearly visible, looking straight at the camera |
| Background | plain and light (white, light grey), without patterns or shadows |
| Lighting | even, frontal, without glare or harsh shadows |
| Sharpness | a crisp image, with no blur or compression artefacts |
No obstructions: hair does not cover the eyes, glasses do not create glare and do not hide the eyes (tinted lenses are prohibited), and headwear is permitted only for religious or medical reasons and must not cover the face.
Why these particular rules: a machine, not a person
In the past, a person checked the photo — a “resemblance” was enough. Today, borders use eGates with automatic facial recognition: the camera takes a live image and compares your face (a 1:1 comparison) with the image stored on the chip of your biometric passport (the DG2 field).
The algorithm needs stable geometric reference points. That is why the rules specify: the width of the head as a proportion of the frame width, the eye line parallel to the top edge, the distance between the eyes preferably 120+ pixels (a minimum of 90 pixels under ISO/IEC 39794-5), and a resolution of at least 300 dpi without compression artefacts. A neutral expression and even lighting remove the “noise” that throws the algorithm off. That is precisely why a smile, a shadow on the face or a tilt of the head is not an aesthetic quibble but a technical error.
Modern standards: 19794-5 → 39794-5
The classic facial-data standard is ISO/IEC 19794-5. It is being replaced by the extensible format ISO/IEC 39794-5, which ICAO takes as the basis for Doc 9303.
The new standard stores not only the image itself but also metadata: facial landmarks, eye colour and hair colour. This improves the interoperability of systems and the speed and accuracy of recognition. Transition timelines: passport-reading systems must support ISO/IEC 39794-5 from 2026, and passport issuers must fully transition by 2030.
Why almost every country requires a biometric photo
Because borders are becoming automated. In the Schengen area, the EES (Entry/Exit System) became fully operational on 10 April 2026 (its phased rollout began on 12 October 2025): it records document data, fingerprints and a facial image, replacing paper stamps. If your photo does not comply with ICAO, the machine will not be able to reliably match the face — hence the single set of strict requirements worldwide.
Related guides
Official sources
Questions
- How does a biometric photo differ from an ordinary one?
- An ordinary photo is assessed by a person on the basis of resemblance. A biometric one is taken to the ICAO Doc 9303 standard for machine recognition: it has a strictly defined head size (70-80% of the frame), eye position, neutral expression, plain background and even frontal lighting.
- How much of the photo should the head take up?
- The head, from chin to crown, must occupy 70-80% of the height of the printed photo. For the standard 35x45 mm format that is approximately 31.5-36 mm.
- Why can't you smile in a biometric photo?
- A neutral expression with a closed mouth is required by facial-recognition algorithms: a smile changes the geometry of the face and reduces matching accuracy at automatic eGates.
- What is ISO/IEC 39794-5 and does it concern me?
- It is the new facial-data format in the passport chip that replaces ISO/IEC 19794-5. Reading systems support it from 2026, and passport issuers will fully transition by 2030. For the applicant, the requirements for the photo itself remain the same — those of ICAO Doc 9303.