GTIN
Term 76 of 175 · Technology
In one sentence
GTIN (Global Trade Item Number) is the unique, worldwide numeric identifier that GS1 assigns to a trade item. It is the number encoded in the barcode, and it lets anyone identify the same item at any point in the supply chain.
Reviewed by Juan Manuel Garrido
Co-founder of VantegrateLinkedIn
GTIN definition
The GTIN (Global Trade Item Number) is the unique, global numeric identifier that the GS1 organization assigns to every trade item. It is the universal key that answers a simple question: exactly what is this item, anywhere in the world. The GTIN is what is encoded inside the barcode that the cashier or the warehouse worker scans; the barcode is only the graphic representation a machine can read, and the GTIN is the number it contains.
The central point is that a given product has a single GTIN, and that number does not change between manufacturer, distributor and retailer. That stability is what makes the GTIN the backbone of traceability: once a system knows which GTIN it is dealing with, it can link it to its lot, its expiration date, its origin and its journey. In goods tracking solutions such as Trazzo, the GTIN is the anchor data point that connects the physical product to its history at every stage.
Unlike the SKU, which is internal to each company, the GTIN is a shared standard: the same number means the same thing to every player in the chain, with no need to translate it.
How it works and where it comes from
A GTIN is not made up: it is obtained through GS1, the global nonprofit organization that manages commercial identification standards (in Argentina it operates as GS1 Argentina). A company that wants to identify its products joins GS1 and receives a company prefix, a block of digits from which it generates the GTIN for each of its items. The last digit of the number is a check digit calculated by formula, which makes it possible to detect scanning or typing errors. That is why the GTIN is not an arbitrary number: it has a structure and an authority behind it.
The variants: GTIN-13, GTIN-14, GTIN-8 and GTIN-12
The GTIN is not a single format but a family of lengths, depending on the packaging level and the region. The golden rule is that the GTIN for each level (consumer unit vs. case vs. pallet) is different, because they are different trade items even if they contain the same thing.
| Variant | Digits | Typical use | Barcode |
|---|---|---|---|
| GTIN-13 | 13 | Consumer sales unit (the most common outside the U.S.) | EAN-13 |
| GTIN-12 | 12 | Sales unit in the U.S. and Canada | UPC-A |
| GTIN-8 | 8 | Small products with no room for an EAN-13 | EAN-8 |
| GTIN-14 | 14 | Case, carton or logistics grouping (not sold individually) | ITF-14 or GS1-128 |
The GTIN-13 is the one anyone recognizes: it is the number on the barcode of a package of cookies on the shelf. The GTIN-14 is the logistics one: it identifies the master case that groups, for example, 24 units of that same product, and it is key for the warehouse, transportation and receiving. Internally, every GTIN is stored as 14 digits by padding with leading zeros, which simplifies integration with management systems.
Why it matters for your business
Without a GTIN, there is no standard way for the supplier's system, the carrier's and the retailer's to talk about the same product. The GTIN is the glue that prevents that chaos:
- Retail and consumer goods: no major supermarket in Argentina accepts a product on its shelves without a registered GTIN; the GTIN is a requirement for listing the item.
- E-commerce: platforms such as Mercado Libre and Amazon ask for the GTIN to publish listings and to avoid catalog duplicates.
- Traceability and recalls: combined with the lot, the GTIN makes it possible to pinpoint exactly which units to pull in a product recall, without stopping all production.
- Logistics: the GTIN-14 on the case speeds up receiving, counting and stock reconciliation.
A concrete example
A small food company in Córdoba launches a new line of sauces. To sell it through supermarket chains, it first joins GS1 Argentina and gets its prefix. It assigns a different GTIN-13 to each flavor (one for "the sauce" is not enough: each variant is a separate trade item). It assigns a GTIN-14 to the 12-unit case. When the truck arrives at the retailer's distribution center, the worker scans the case's GTIN-14 and the system instantly knows what it contains, how many units and which purchase order it belongs to, all without typing anything by hand.
Common mistakes
The most frequent one is reusing a GTIN for a new product, or changing the formula without changing the number: the GTIN must be stable for the chain to trust it. Another mistake is using the same GTIN for different packaging levels, when the unit and the case need their own numbers. It is also common to confuse the GTIN with the barcode: the barcode is the drawing, the GTIN is the data. Finally, generating "homemade" GTINs without GS1 breaks global uniqueness and ends up being rejected by retailers.
FAQs about GTIN
What is a GTIN?
What is a GTIN?
GTIN (Global Trade Item Number) is the unique, global numeric identifier that GS1 assigns to a trade item. It is the number encoded inside the barcode, and it makes it possible to identify exactly the same item at any point in the supply chain, regardless of the country or the company handling it.
What is the difference between a GTIN and a barcode?
What is the difference between a GTIN and a barcode?
The barcode is the graphic representation (the bars and spaces) that a scanner can read; the GTIN is the number that barcode contains. Put another way, the barcode is the drawing and the GTIN is the data. The same GTIN can be represented in different barcode symbologies, such as EAN-13 or ITF-14, depending on the case.
What is the difference between a GTIN and a SKU?
What is the difference between a GTIN and a SKU?
The GTIN is a global identifier standardized by GS1: the same number means the same thing to every player in the chain. The SKU is internal to each company; each business defines it according to its own logic, and it does not help other systems recognize the product. A product usually has a single GTIN and, in addition, its own SKU at each company that sells it.
What is the difference between GTIN-13 and GTIN-14?
What is the difference between GTIN-13 and GTIN-14?
The GTIN-13 (13 digits, EAN-13 barcode) identifies the consumer sales unit, such as the package you buy off the shelf. The GTIN-14 (14 digits) identifies a logistics grouping, such as the case or carton that contains several units of that product. They are different numbers because the unit and the case are different trade items, even if they contain the same thing.
How do I get a GTIN for my product?
How do I get a GTIN for my product?
You join GS1, the organization that manages identification standards (in Argentina, GS1 Argentina). GS1 gives you a company prefix, and from that prefix you generate the GTIN for each of your products, adding a check digit calculated by formula. You should not create GTINs on your own without GS1, because they lose global uniqueness and retailers reject them.
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Related terms
- SKUA SKU (Stock Keeping Unit) is the unique internal code a company assigns to each sellable product to identify it, control its inventory and track it across inventory, sales and logistics systems. Each company defines its own.
- TraceabilityTraceability is the ability to follow and reconstruct the full journey of a product, lot or document across the supply chain, recording its origin, transformations and destination at each step to answer what, when and where with verifiable data.
- Lot and Expiration TrackingLot and expiration tracking is the traceability control that identifies each production batch (lot) and its use-by or expiration date, so a product can be followed from its origin to the end customer and withdrawn precisely if something goes wrong.
- Inventory ReplenishmentInventory replenishment is the process of restocking a point of sale, warehouse or shelf with goods to keep inventory at the right level, avoiding both stockouts and overstock. It defines how much, when and where to restock each product based on its turnover and demand.
- Last-Mile DeliveryLast-mile delivery is the final stage of the logistics chain: the leg from the last distribution center to the customer's door. It is the most expensive and complex part of delivery, and the one that most shapes the buyer's experience.
- OTIFOTIF (On Time In Full) is the logistics metric that measures what percentage of orders are delivered both on time and complete. It combines punctuality and accuracy in a single service indicator: an order only counts as OTIF if it meets both conditions.
Related questions
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