Who created the MRZ standard (ICAO)?

The MRZ standard was created by the International Civil Aviation Organization, a United Nations specialized agency that sets global standards for civil aviation, including the format of travel documents. ICAO introduced the concept in the early 1980s, motivated by a straightforward problem: as international air travel grew rapidly, manually checking every passport at every border crossing was becoming a genuine bottleneck, and inconsistent national passport formats made it hard for one country's equipment to reliably read another country's documents.

ICAO's solution was to define a standardized, machine-readable data zone that every member state's passports could include, using a common font, common field positions, and common check-digit logic. That work is documented in ICAO Doc 9303, formally titled "Machine Readable Travel Documents," which has been revised multiple times since its introduction as electronic passports, chip-based documents, and new security features have been added.

The standard isn't limited to passports. Doc 9303 also covers visas, and through related work, has influenced how many countries format machine-readable national ID cards, even though ID cards fall slightly outside ICAO's core aviation mandate.

Because so many countries adopted the ICAO format for their broader identity documents too, MRZ has become a near-universal building block for identity verification well beyond airports, used today in banking, hospitality, healthcare, and retail, not just border control.

What makes ICAO's standard so durable is that it was designed for interoperability from the start. A border agent in one country doesn't need special software to read a passport from another country, because both follow the same field layout, font, and check-digit algorithm.

That's a very different situation from driver's licenses, for example, which follow country- or region-specific standards like AAMVA in North America rather than one global format.

For a document scanning company, working within the ICAO framework means every MRZ-compliant document in the world can, in principle, be read with the same underlying logic, even as the surrounding visual design of passports and ID cards varies enormously from country to country. ScanDoc builds its MRZ reading around this ICAO 9303 standard, which is part of why it can support documents from a very wide range of countries without needing a bespoke reader for each one.