QR Code
Definition
A two dimensional matrix symbology defined by ISO/IEC 18004 that encodes data in a square grid of modules, readable by standard camera devices and tolerant of partial damage through built in error correction.
Expanded Explanation
The QR code is the default passport carrier for consumer facing products because almost every mobile device can read one without an application. It supports four levels of error correction, so a symbol can still be decoded when part of it is obscured, and it can be printed, etched, woven or moulded.
Practical readability depends on the module size, the printing method, the substrate and the contrast, not on the encoded content. Very long encoded strings force a denser symbol, which raises the minimum printed size and the risk of failed scans on small items. Encoding a short resolvable identifier is therefore both a durability and a governance decision.
Where the product is small, harsh in use, or scanned in bulk, other carriers may be more appropriate: a GS1 DataMatrix for small marking areas, or radio frequency identification where line of sight is impossible.
Why It Matters
The QR code is the part of a passport that end users actually experience. A symbol that is too small, poorly contrasted, placed on a label that is removed at first use, or pointing at a marketing page rather than the passport, undermines the entire implementation regardless of the quality of the underlying data.
Common Misconceptions
The obligation concerns the passport and its accessibility, not the symbol. A QR code linking to a brand website does not create a passport, and one that cannot survive the product’s service life does not provide the required access.
Related Terms
Related Knowledge Base Articles
Related Articles
- Data Carrier
- GS1 Digital Link
- EPCIS
- GS1
- GTIN
- Harmonised Technical Specification
- Resolver
- QR Codes vs GS1 Digital Link: What’s the Difference?
See Also
References
- ISO/IEC 18004, QR code bar code symbology specification: https://www.iso.org/standard/83389.html
- GS1 General Specifications: https://www.gs1.org/standards/barcodes-epcrfid-id-keys/gs1-general-specifications
- Regulation (EU) 2024/1781, Official Journal of the European Union: https://eur-lex.europa.eu/eli/reg/2024/1781/oj
About This Article
tieback Knowledge is a continuously maintained reference library covering Digital Product Passports, product traceability, product compliance and related regulations. Articles are reviewed regularly as legislation, standards and implementation guidance evolve.