TECHNICAL GLOSSARY · STANDARDS DEFINITION · VERIFIED 2026-11-10
ICAO 9303
Authoritative Definition
ICAO Doc 9303 is the international standard published by the International Civil Aviation Organization governing machine-readable travel documents, biometric passport formats, and facial image criteria.
Common Aliases:ICAO StandardsBiometric Passport Standard
## International Biometric Passport Standards
ICAO Doc 9303 defines universal parameters for biometric passports recognized by 193 United Nations member states.
Key requirements include:
- **Crown-to-Chin Ratio:** Facial height must occupy between 70% and 80% of the total frame height.
- **Eye Line Positioning:** Eye center line positioned between 50% and 70% from the bottom of the photo.
- **Background Uniformity:** Plain white or light grey background with zero shadows and neutral exposure.
Related Client-Side Privacy Tools
Run the in-browser implementations adhering to ICAO 9303 with zero server uploads.