> For clean Markdown of any page, append .md to the page URL. > For a complete documentation index, see https://tieback.io/docs/llms.txt. > For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://tieback.io/docs/_mcp/server. # GTIN > The Global Trade Item Number: a GS1 identification key that identifies a trade item type, not an individual physical item. ## Definition The Global Trade Item Number is a GS1 identification key that uniquely identifies a trade item, a product or service configuration that may be priced, ordered or invoiced at any point in a supply chain. It identifies the item type, not the individual physical unit. ## Expanded Explanation A GTIN is issued from a GS1 Company Prefix licensed to a brand owner, which is what makes it globally unambiguous rather than merely unique inside one company's systems. It exists in four lengths, GTIN-8, GTIN-12, GTIN-13 and GTIN-14, which are the same key represented at different capacities, commonly used for small packs, North American retail, general retail and higher packaging levels respectively. Systems normally store the key right-aligned in a fourteen-digit field so the lengths can be compared reliably. The scope of a GTIN is a distinct trade item. A different size, colour, formulation, pack count or material change is a different trade item and takes a different GTIN. Conversely, every unit of the same trade item shares one GTIN, which is why a GTIN alone cannot distinguish two boxes on the same pallet. Instance-level identity comes from combining the GTIN with additional data. A GTIN plus a batch or lot number identifies a production run; a GTIN plus a serial number identifies a single physical item. Those combinations, not the GTIN by itself, are what serialised traceability and item-level passports depend on. A GTIN is carried, not displayed for its own sake. It can be encoded in a linear barcode, a [QR code](/docs/knowledge-base/glossary/qr-code), a DataMatrix or an RFID tag, the [data carrier](/docs/knowledge-base/glossary/data-carrier) is the delivery mechanism and the GTIN is the payload. When the payload is expressed as a structured web address under [GS1 Digital Link](/docs/knowledge-base/glossary/gs1-digital-link), the same key becomes resolvable, so a scan can be routed to product information, instructions or a passport endpoint. In event data the GTIN answers "what". An EPCIS event records that something happened to a specified object at a time and place; the object is identified using GS1 keys, typically a GTIN with batch or serial qualification. ## Why It Matters Most product data problems that surface late in a passport programme are identity problems that were present all along. If the same trade item carries different keys in different systems, or one key is reused across variants, then linking evidence, events and published information to the right product becomes guesswork. A correctly assigned GTIN gives the whole chain one agreed answer to "which product is this". ## Relationship to Digital Product Passports Where a Digital Product Passport is required, it must be linked to the product through a persistent identifier and made accessible via a data carrier. A GTIN, particularly when combined with batch or serial data and expressed as a Digital Link URI, is a well-established way to satisfy that need and is widely assumed in industry practice. It is a practical option, not an automatic legal answer: what any given product group must actually carry is set by the applicable delegated act. ## Common Misconceptions #### A GTIN is a barcode or a QR code A GTIN is a number. A barcode, QR code or RFID tag is a carrier that can encode it. The same GTIN can appear in several different carriers on the same product. #### A GTIN is a URL, or is itself the passport A GTIN carries no destination and no content. GS1 Digital Link places the key inside a web address; the passport is the published information reached through resolution, which is a separate thing again. #### A GTIN identifies an individual physical item It identifies a trade item type. Every unit of that item shares the key. Individual identity requires the GTIN plus a serial number, and production-run identity requires the GTIN plus a batch or lot number. #### ESPR mandates GTINs Regulation (EU) 2024/1781 requires a unique product identifier and a data carrier, and leaves the specifics to delegated acts. It does not, in itself, mandate GS1 keys for all products. ## Related Terms * [Product Identifier](/docs/knowledge-base/glossary/product-identifier) * [GS1](/docs/knowledge-base/glossary/gs1) * [GS1 Digital Link](/docs/knowledge-base/glossary/gs1-digital-link) * [Data Carrier](/docs/knowledge-base/glossary/data-carrier) * [EPCIS](/docs/knowledge-base/glossary/epcis) * [Product Master Data](/docs/knowledge-base/glossary/product-master-data) ## Related Knowledge Base Articles * [What is a GTIN?](/docs/knowledge-base/standards-and-technology/what-is-a-gtin) * [What is a Product Identifier?](/docs/knowledge-base/standards-and-technology/what-is-a-product-identifier) * [What is Product Master Data?](/docs/knowledge-base/enterprise-systems-and-data-architecture/what-is-product-master-data) ## Related Articles * [GS1](/docs/knowledge-base/glossary/gs1) * [GS1 Digital Link](/docs/knowledge-base/glossary/gs1-digital-link) * [Resolver](/docs/knowledge-base/glossary/resolver) * [EPCIS](/docs/knowledge-base/glossary/epcis) * [Product Identifier](/docs/knowledge-base/glossary/product-identifier) * [Data Carrier](/docs/knowledge-base/glossary/data-carrier) * [Harmonised Technical Specification](/docs/knowledge-base/glossary/harmonised-technical-specification) * [QR Code](/docs/knowledge-base/glossary/qr-code) ## See Also * [Standards & Technology](/docs/knowledge-base/standards-and-technology/overview) * [Enterprise Systems & Data Architecture](/docs/knowledge-base/enterprise-systems-and-data-architecture/overview) ## References * GS1, identification keys including the GTIN: [https://www.gs1.org/standards/id-keys](https://www.gs1.org/standards/id-keys) * GS1 General Specifications: [https://www.gs1.org/standards/barcodes-epcrfid-id-keys/gs1-general-specifications](https://www.gs1.org/standards/barcodes-epcrfid-id-keys/gs1-general-specifications) * GS1 Digital Link standard: [https://www.gs1.org/standards/gs1-digital-link](https://www.gs1.org/standards/gs1-digital-link) * Regulation (EU) 2024/1781 establishing a framework for ecodesign requirements: [https://eur-lex.europa.eu/eli/reg/2024/1781/oj](https://eur-lex.europa.eu/eli/reg/2024/1781/oj) ## About This Article About This Article
Last Reviewed
2026-08-09
Next Scheduled Review
2027-08-09
Article Version
1.0
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. ## Related Docs * [Standards & Technology](/docs/knowledge-base/standards-and-technology/overview) * [Digital Product Passports](/docs/knowledge-base/digital-product-passports/overview) * [Glossary](/docs/knowledge-base/glossary/overview)