> 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. # What is a GTIN? > A vendor neutral explanation of the Global Trade Item Number: what a GTIN is, why it exists, how company prefixes and item references make it globally unique, how GTIN-8, GTIN-12, GTIN-13 and GTIN-14 differ, and how GTINs underpin Digital Product Passports. ## Executive Summary The Global Trade Item Number is the most widely used product identification standard in the world. It sits behind almost every retail transaction, most supply chain messages and a growing share of regulatory reporting. It is also, consistently, one of the most misunderstood concepts in product data. The misunderstanding has a single root: people meet the GTIN through the barcode. They see a striped symbol on a package, they watch it beep at a till, and they conclude that the barcode is the identifier. It is not. The barcode is a printed pattern that carries a number. The number is the GTIN. Erase the barcode and the GTIN still exists, in catalogues, invoices, customs declarations and databases. Change the barcode symbology and the GTIN does not change at all. A **GTIN is a globally unique number that identifies a trade item**: a product or service that is priced, ordered or invoiced at any point in a supply chain. Its purpose is narrow and its discipline is strict. It does not describe the product. It does not identify an individual unit. It answers one question, unambiguously and across organisational and national borders: *which trade item is this?* Global uniqueness is the property that makes it valuable, and that property is manufactured, not assumed. A GTIN is built from a [GS1](/docs/knowledge-base/glossary/gs1) Company Prefix, licensed to one organisation and to no other, followed by an item reference which that organisation allocates itself, closed by a check digit that catches transcription errors. Because prefixes never overlap, two companies cannot issue the same GTIN, and no central registry has to approve each product. That is a governance design, not a technical one, and it is why the scheme has survived five decades. For Digital Product Passports, the GTIN matters because it is the most widely recognised answer to the identification requirement that every passport regime begins with. It is not the only possible answer, and regulation does not name it as mandatory. But where a product is traded openly and must be recognised by parties who have never met, a GTIN is the value most systems already know how to read. * A GTIN is a number that identifies a trade item. A barcode is one way of carrying that number. - Global uniqueness comes from licensed GS1 Company Prefixes, not from a central product database. - UPC and EAN are historical names for what are now GTIN-12 and GTIN-13. They are formats, not different standards. - A GTIN identifies a product class, not an individual unit. Serial and batch numbers do that. - A GTIN is not an SKU. One is global and governed; the other is internal and disposable. - A Digital Product Passport may use a GTIN as its product identity, expressed through GS1 Digital Link and carried in a QR code. This is the sixth article in the Standards & Technology pillar and the sixteenth in the tieback Knowledge learning path. It follows [What is a Product Identifier?](/docs/knowledge-base/standards-and-technology/what-is-a-product-identifier), which sets out the general concept that the GTIN implements. Framework TBF-016 The Global Product Identity Model Explains what a globally unique trade item number identifies, and the boundary of what it cannot express. ## Table of Contents * [Definition](#definition) * [Why Products Need Global Identification](#why-products-need-global-identification) * [The Global Product Identity Model](#the-global-product-identity-model) * [What Makes a GTIN Globally Unique?](#what-makes-a-gtin-globally-unique) * [Understanding GTIN Structure](#understanding-gtin-structure) * [GTIN-8](#gtin-8) * [GTIN-12 (UPC)](#gtin-12-upc) * [GTIN-13 (EAN)](#gtin-13-ean) * [GTIN-14](#gtin-14) * [How GTINs Are Assigned](#how-gtins-are-assigned) * [GS1 Company Prefix Explained](#gs1-company-prefix-explained) * [GTIN vs SKU](#gtin-vs-sku) * [GTIN vs UPC](#gtin-vs-upc) * [GTIN vs EAN](#gtin-vs-ean) * [GTIN vs Serial Number](#gtin-vs-serial-number) * [GTIN vs QR Code](#gtin-vs-qr-code) * [GTIN and GS1 Digital Link](#gtin-and-gs1-digital-link) * [GTIN and Digital Product Passports](#gtin-and-digital-product-passports) * [Benefits for Manufacturers](#benefits-for-manufacturers) * [Benefits for Retailers](#benefits-for-retailers) * [Benefits for Regulators](#benefits-for-regulators) * [Benefits for Consumers](#benefits-for-consumers) * [Common Misconceptions](#common-misconceptions) * [Frequently Asked Questions](#frequently-asked-questions) * [Key Takeaways](#key-takeaways) * [Related Articles](#related-articles) * [Related Glossary Terms](#related-glossary-terms) * [References](#references) * [About This Article](#about-this-article) ## Definition A globally unique number that identifies a trade item, defined and governed by GS1. It is the identifier itself: a string of digits, independent of how it is printed, stored or transmitted. Any product or service on which information is needed and which may be priced, ordered or invoiced at any point in a supply chain. A single consumer unit is a trade item; so is the case containing twelve of them, and each is identified separately. A number licensed to one organisation by a GS1 Member Organisation. It forms the leading digits of every identification key that organisation issues, and it is what guarantees that its numbers cannot collide with anyone else's. The digits an organisation allocates itself, after its company prefix, to distinguish one of its trade items from another. It carries no meaning and should not be made to carry any. The final digit, calculated arithmetically from the digits before it. It allows a system to detect most keying and scanning errors immediately, before a wrong product is ordered or dispensed. ## Why Products Need Global Identification Global identification exists to solve a problem that only appears at organisational boundaries. Inside one company, identification is easy. Everyone uses the same system, the same codes and the same conventions. The moment a product crosses into another organisation, all of that stops being shared. The manufacturer's part number means nothing to the distributor. The distributor's catalogue line means nothing to the retailer. The retailer's shelf code means nothing to the customs authority. Each boundary requires a translation, and each translation is a place where data quietly goes wrong. Before global identification, retail worked exactly this way. Every chain maintained its own product codes, every supplier maintained a mapping to every customer's scheme, and price marking was done by hand on each item. The introduction of a shared numbering system in the 1970s did not merely speed up checkouts; it removed the translation layer entirely, because for the first time the number on the pack meant the same thing to everyone who read it. That property, one value with one meaning everywhere, is what a GTIN sells. It is worth being precise about what it costs. Global identification requires an organisation to accept rules it did not write: rules about when a new number must be allocated, about what constitutes a different product, and about maintaining data associated with the number. Organisations that treat those rules as optional get numbers that look global and behave locally, which is worse than not having them. #### Reusing a GTIN for a new product When a product is discontinued and a replacement launched, it is tempting to reuse the number. It is already printed on artwork, already in the retailer's system, already known. Reuse silently corrupts every historical record, every sales analysis and every compliance document that referenced it. Allocation rules exist precisely to prevent this, and they should be treated as binding. ## The Global Product Identity Model The framework below sets out the seven layers between an organisation and a published Digital Product Passport. It is a chain of dependency: each layer is meaningful only because the one beneath it is governed. Its argument is that a GTIN provides one globally recognised product identity that enables trusted identification across organisations, systems and countries. Allocation Identity Use L1 Manufacturer Accountable party The organisation that brings the trade item to market and is answerable for what the identifier refers to. Identity begins with accountability: someone must be responsible for the number meaning what it claims to mean. L2 GS1 Company Prefix Licensed A number licensed to that organisation alone. Because no two prefixes overlap anywhere in the world, uniqueness is guaranteed at the point of allocation rather than checked afterwards. This is the layer that does the real work. L3 Item Reference Self-allocated The digits the organisation assigns to distinguish one of its trade items from another. No approval is needed and none is sought, because the prefix has already reserved the space. The reference is deliberately meaningless. L4 GTIN The identity Prefix plus item reference plus check digit: one number that identifies this trade item anywhere. It is format independent and carrier independent, and it is intended to remain fixed for the life of the product. L5 Data Carrier Interchangeable The physical representation that makes the number machine readable: a linear barcode, a DataMatrix, a QR code, an RFID tag. Carriers are chosen for packaging, durability and reading environment, and can be replaced without touching the identity. L6 Business Systems Exchange Ordering, invoicing, warehousing, point of sale, customs, recall management and traceability platforms. Every one of them joins records by matching the same number, which is what removes the translation layer between organisations. L7 Digital Product Passport Outcome The maintained, accessible record of product information, retrieved by identity and reached through a carrier. The GTIN is one recognised way of supplying the unique product identifier a passport requires. The model's argument: a GTIN provides one globally recognised product identity that enables trusted identification across organisations, systems and countries. Layers one to four are governance and are expensive to revisit. Layers five to seven are implementation and are expected to change repeatedly. Programmes that begin at layer five, by choosing a carrier, inherit an identity they never designed. > **The prefix is the product, not the number** > > Organisations often think they are buying barcodes. They are buying a licensed numbering space and > the obligation to manage it. The barcodes are free to produce; the discipline is the cost, and the > discipline is what other parties are relying on. ## What Makes a GTIN Globally Unique? Uniqueness in the GTIN system is structural rather than administrative, and the distinction is worth understanding because it explains why the scheme scales. There is no world database of products that must be consulted before a number is issued. Instead, uniqueness is delegated. A GS1 Member Organisation licenses a company prefix to one organisation. That prefix is not licensed to anyone else, anywhere. Every identification key the organisation creates begins with it. Therefore every key it creates is automatically distinct from every key created by every other licensee, without coordination, approval or lookup. The consequence is that uniqueness holds as long as two conditions hold: prefixes are never issued twice, which is the licensor's responsibility, and item references are never issued twice within a prefix, which is the licensee's. The second condition is where failures actually occur, and they occur through poor internal record keeping rather than through any weakness in the standard. The check digit adds a second, narrower guarantee. It does not confirm that a number is allocated or that a product exists. It confirms only that the digits presented are internally consistent, which catches the large majority of single-digit mistypes and transposed pairs at the moment of entry. #### Believing a valid check digit means a valid product Validation tools that confirm a check digit are testing arithmetic, not existence. A syntactically perfect GTIN can be entirely fictitious. Confirming that a number is genuinely allocated requires querying the relevant registry service, which is a different operation with a different answer. ## Understanding GTIN Structure Every GTIN, regardless of length, is composed of the same three elements in the same order. **Company prefix.** Variable length, licensed. A larger organisation with many products typically holds a shorter prefix, which leaves more digits for item references; a small organisation holds a longer prefix with room for fewer products. The length is an allocation decision, not a status symbol. **Item reference.** Whatever digits remain, allocated internally. Sequential allocation is normally best practice, precisely because it prevents anyone from inferring meaning. **Check digit.** One digit, calculated from the others using a defined weighting method, always in the final position. GTINs are expressed in four lengths. The essential point, frequently missed, is that these are **formats of one identifier**, not four competing standards. A shorter GTIN can be represented in a longer field by padding it with leading zeros, which is why systems are expected to store GTINs in a 14-digit field regardless of the format printed on the pack. | Format | Digits | Primary use | Regional origin | | ------- | ------ | ------------------------------------------------- | ------------------ | | GTIN-8 | 8 | Very small items where space is genuinely limited | EAN-8 | | GTIN-12 | 12 | Retail, historically North America | UPC | | GTIN-13 | 13 | Retail, most of the world | EAN-13 | | GTIN-14 | 14 | Cases, cartons and other higher packaging levels | ITF-14 and databar | #### Store fourteen digits, always Systems that store GTINs in fields sized to the format they first encountered break when a different format arrives. Normalising every GTIN to fourteen digits with leading zeros at the point of capture eliminates an entire family of matching failures that are otherwise diagnosed as "supplier data quality issues" years later. ## GTIN-8 The eight digit format exists for a single reason: physical space. Some trade items are too small to carry a full-size symbol legibly, and confectionery, cosmetics samples and small pharmaceutical packs are the usual examples. Because the format is short, the numbering space is scarce, and allocation is correspondingly restricted. It is issued by GS1 Member Organisations on justification rather than on request, and it should be treated as an exception granted for a demonstrated constraint. Choosing GTIN-8 to save label real estate on a product that could accommodate a longer symbol is a misuse of a shared and limited resource. ## GTIN-12 (UPC) The twelve digit format is the original. Introduced for grocery retail in North America in the 1970s, it was the first widely adopted machine readable product identifier and remains ubiquitous in that market. It is now formally a GTIN-12, carried in a UPC-A symbol. The change of name matters more than it appears: the identifier was harmonised into a single global scheme, and what was once a national system became one length of an international one. Systems that still model "UPC" as a distinct field alongside "EAN" and "GTIN" are reproducing a distinction that the standard removed decades ago, and they generate reconciliation work indefinitely as a result. ## GTIN-13 (EAN) The thirteen digit format is the most widely used GTIN worldwide and is the default for retail products outside North America. It was created by adding a leading digit to the twelve digit structure, which allowed international adoption without invalidating anything already issued. That backwards compatibility is the reason the transition succeeded, and it is a useful illustration of how identification standards evolve: extension rather than replacement, because replacement would strand every product already labelled. The first digits of a GTIN-13 are frequently, and wrongly, read as a country of origin. They identify the GS1 Member Organisation that licensed the prefix, which reflects where the company registered, not where the product was made. #### Reading the country of manufacture from the prefix A product carrying a prefix licensed in one country may be manufactured in another entirely. Prefix ranges indicate the licensing Member Organisation and nothing more. Origin claims must come from origin data, not from the identifier. ## GTIN-14 The fourteen digit format identifies trade items at packaging levels above the consumer unit: the case of twelve, the pallet layer, the shipper carton. It is normally constructed from the GTIN of the item inside, prefixed by an indicator digit that distinguishes the packaging level. This preserves the relationship between the case and its contents while making them separately orderable, which is exactly what a distribution system needs: the retailer orders cases and sells units, and both must be identifiable. #### One product, three trade items A 500 ml bottle of shampoo sold to consumers carries its own GTIN. The case of twelve bottles that the retailer orders carries a different GTIN, at the fourteen digit level. A promotional twin pack containing two bottles is a third trade item, with a third GTIN, because it is ordered, priced and scanned differently from either of the others. One physical product; three distinct trade items; three identifiers. ## How GTINs Are Assigned Assignment is a two part process, and organisations that understand only the first part run into trouble later. **Part one is licensing.** An organisation obtains a GS1 Company Prefix from a GS1 Member Organisation, typically the one in the country where it is established. This is an ongoing licence rather than a purchase, and the associated obligations continue for as long as the numbers are in use. **Part two is allocation.** The organisation issues item references from its own prefix, one per distinct trade item, and records what each one refers to. Nobody else is involved. This is where governance either exists or does not. The rules about *when* a new GTIN is required are published as an allocation standard, and they address the question that generates almost all real world disputes: what counts as a different product. The general principle is that a new GTIN is needed when the change is significant to trading partners or consumers, such as a change in what the product fundamentally is or in its declared net content, while minor changes such as a graphics refresh do not require one. #### Write down who allocates, and when The most durable safeguard is procedural, not technical: a named owner for allocation, a single authoritative register of issued numbers, and a written rule for when a change triggers a new identifier. Organisations that leave this to whoever is preparing artwork discover duplicates and gaps only when a trading partner rejects a file. ## GS1 Company Prefix Explained The company prefix is the most consequential and least visible element of the system. It is variable in length by design. Because the total number of digits is fixed, the prefix length determines how many item references remain available. An organisation expecting to identify tens of thousands of trade items needs a shorter prefix; one with a handful of products does not, and issuing short prefixes indiscriminately would exhaust the global numbering space. Three implications follow, and each catches organisations out. **Prefix length cannot be inferred by reading a number.** It is a property of the licence, not something visible in the digits. Software that attempts to split a GTIN into "company" and "product" segments by assuming a fixed boundary will be wrong for many numbers. **The prefix identifies the licensee, not the manufacturer.** A retailer's own-brand product usually carries the retailer's prefix, because the retailer is the brand owner bringing it to market, even though a contract manufacturer produced it. **The licence must be maintained.** Prefixes that lapse can eventually be reissued, and products still in circulation under a lapsed prefix are a genuine data integrity risk in long-life product categories. ## GTIN vs SKU This is the most common confusion in day to day operations, because both are numbers attached to a product in a system, and internally both feel authoritative. | Aspect | GTIN | SKU | | ------------------ | ------------------------------------------- | --------------------------------------------- | | Governed by | GS1 standards and allocation rules | The organisation, freely | | Unique across | All GS1 licensees worldwide | One organisation's systems only | | Assigned by | The brand owner, from a licensed prefix | Whoever manages inventory | | Structure | Fixed length numeric with a check digit | Any format, often alphanumeric and meaningful | | Stability | Intended to be permanent | Frequently reorganised or migrated | | Used for | Trade, customs, regulation, public identity | Internal stock, picking, replenishment | | Publish externally | Yes | No | Both are legitimate and most organisations need both. An SKU can encode warehouse logic, seasonal grouping or size runs precisely because nobody outside has to interpret it. A GTIN must not encode any of that, precisely because everybody outside does. The requirement is a maintained mapping between them, owned deliberately rather than reconstructed by spreadsheet whenever a partner asks. ## GTIN vs UPC Strictly, this is not a comparison of two things. UPC is the historical name of what is now the twelve digit format of the GTIN. | Aspect | GTIN | UPC | | ------------ | ------------------------------------ | ---------------------------------------- | | Nature | The global identification key | A historical name, now GTIN-12 | | Scope | All formats: 8, 12, 13 and 14 digits | Twelve digits only | | Geography | Global | Originated in North America | | Current use | The correct term in all standards | Common colloquially and in older systems | | Relationship | The category | One length within that category | The practical guidance is simple: use GTIN in data models, contracts and specifications, and treat "UPC" as a legacy label that may appear in supplier communications. Modelling them as separate fields creates duplicate storage of the same value and, eventually, disagreement between the two. ## GTIN vs EAN The same relationship applies. EAN, the European Article Number, is the historical name for the thirteen digit format, now GTIN-13. | Aspect | GTIN | EAN | | ------------ | --------------------------------- | --------------------------------------- | | Nature | The global identification key | A historical name, now GTIN-13 | | Scope | All four formats | Thirteen digits only | | Geography | Global | Originated in Europe | | Current use | The correct term in all standards | Still widespread in retail conversation | | Relationship | The category | One length within that category | The unification of UPC and EAN into a single GTIN scheme is one of the quieter achievements in commercial standardisation. It is also the reason the terms persist: both remained accurate descriptions of a symbol length, so neither ever fully disappeared from everyday use. ## GTIN vs Serial Number These answer different questions and are complements rather than alternatives. | Aspect | GTIN | Serial number | | ------------ | ------------------------------------ | ------------------------------------------------- | | Identifies | A trade item class | One individual unit | | Cardinality | One value covers many physical units | One value covers exactly one unit | | Governed by | GS1 allocation rules | The manufacturer's own scheme | | Unique alone | Globally | Usually only within one manufacturer's series | | Typical use | Ordering, invoicing, point of sale | Warranty, service history, authentication, recall | | Together | Identifies the product | Narrows it to the unit in hand | Combined, a GTIN and a serial number form a globally unambiguous reference to one specific object: this product, this unit. That pairing is what unit level traceability requires, and it is why regulated sectors specify both rather than choosing between them. Serialisation carries real cost in marking and data volume, so it is applied where the questions genuinely attach to individual units. ## GTIN vs QR Code This comparison is a category error made visible, and stating it plainly resolves most of the confusion around Digital Product Passports. | Aspect | GTIN | QR code | | --------------------------- | ------------------------------- | ------------------------------------------------------------------------------ | | What it is | An identifier: a number | A [data carrier](/docs/knowledge-base/glossary/data-carrier): a printed symbol | | Contains | Nothing; it is the content | Whatever characters are encoded into it | | Governed by | GS1 identification standards | ISO/IEC symbology specification | | Changes when | The trade item changes | The artwork or payload is regenerated | | Can exist without the other | Yes, in catalogues and invoices | Yes, carrying anything at all | | Relationship | The thing being carried | One of several ways to carry it | A GTIN can be carried in a linear barcode, a DataMatrix, a [QR code](/docs/knowledge-base/glossary/qr-code) or an RFID tag. The identifier is unchanged in every case. Saying a product "has a QR code" describes the packaging; saying it "has a GTIN" describes its identity. ## GTIN and GS1 Digital Link [GS1 Digital Link](/docs/knowledge-base/glossary/gs1-digital-link) is the standard that expresses an identification key as a structured web address, so that the same value is simultaneously readable by business systems and actionable by a browser. The significance for the GTIN is that it becomes web native without becoming a different number. A Digital Link address contains the GTIN in a defined position, so a scanner can extract the identifier without opening anything, while a phone camera can follow the address and receive whatever the [resolver](/docs/knowledge-base/glossary/resolver) decides that requester should see. Consumers, repairers, regulators and recyclers can be served different destinations from one printed symbol, because resolution is configuration rather than print. #### One GTIN, four systems, one identity **Retail.** A supermarket's point of sale looks up price and promotions by GTIN; its replenishment system orders the case GTIN from the supplier. **Medical devices.** A single-use surgical instrument carries a device identifier alongside production data such as lot and expiry. Hospital inventory, implant registries and recall notices all key on the same device identity. **Industrial products.** A valve manufacturer identifies each catalogue variant with a GTIN, which distributors use for ordering while maintenance systems attach service records to the individual serial number beneath it. **Consumer electronics.** A headphone model is ordered, sold and returned by GTIN, warranty is tracked by serial number, and a Digital Link address on the box resolves to manuals, repair guidance and recycling information for the same GTIN. Four industries, four systems, one identity that never changes. ## GTIN and Digital Product Passports Every [Digital Product Passport](/docs/knowledge-base/glossary/digital-product-passport) regime begins with the same requirement: a data carrier linked to a unique product identifier. Under Regulation (EU) 2024/1781, the ecodesign framework states that requirement in general terms and leaves the specifics to the applicable [delegated act](/docs/knowledge-base/glossary/delegated-act) for each product group. Regulation (EU) 2023/1542 takes a comparable approach for battery passports. A GTIN can satisfy that requirement, and it is often the pragmatic choice, for three reasons. It is already allocated for most traded products, so no new identification programme is needed. It is already recognised by trading partners and authorities. And it already has a standardised web expression through Digital Link, which means the identification and access requirements can be met with one decision rather than two. Three qualifications matter, and glossing over them causes real programme risk. **A GTIN is not mandatory.** Legislation specifies outcomes, not vendors. Sectors with established identification frameworks may satisfy the requirement through those instead. The delegated act governing your product group is the document that decides. **A GTIN alone may not be granular enough.** It identifies a trade item class. Where a passport must carry batch specific or unit specific information, such as recycled content that varies by production run, the GTIN must be qualified by a batch or serial number. **Identification is necessary, not sufficient.** A passport also requires maintained data, accessibility, differentiated access for different actors and durability over time. The identifier opens the door; it does not furnish the room. #### Assuming existing GTINs are passport ready Many organisations hold GTINs whose associated data was never maintained beyond what retail required: a description, a size, a price. Passport obligations demand materials, compliance evidence and lifecycle information against the same identifier. The number is reusable; the data behind it usually is not. ## Benefits for Manufacturers A single identity that trading partners already accept removes an entire category of onboarding work. New customers do not require a new coding scheme; they require the number that already exists. Product data stops fragmenting across customer-specific mappings, so a change made once propagates consistently. Recalls can be scoped by GTIN and narrowed further by batch, which is the difference between withdrawing a production run and withdrawing a product line. Compliance documentation attaches to a value that regulators and customers both recognise, rather than to an internal code that must be explained each time. ## Benefits for Retailers Retail operations are built on matching, and the GTIN is what makes matching automatic. Goods receipt reconciles against orders without manual intervention. Point of sale returns the right price and the right promotion. Inventory accuracy improves because the same item is not recorded under three different codes from three suppliers. Onboarding a new supplier becomes a data exchange rather than a mapping project, and marketplace listings match to existing catalogue entries instead of creating duplicates. ## Benefits for Regulators For [market surveillance](/docs/knowledge-base/glossary/market-surveillance) authorities, a globally recognised identifier makes enforcement precise rather than approximate. An authority can establish exactly which products a [declaration of conformity](/docs/knowledge-base/glossary/eu-declaration-of-conformity) covers, scope a [corrective action](/docs/knowledge-base/glossary/corrective-action) to the affected items, and trace a non compliant product to the responsible [economic operator](/docs/knowledge-base/glossary/economic-operator). Cross border cooperation becomes practical: a finding in one market can be acted on in another, because both authorities are referring to the same value rather than to model names and photographs. ## Benefits for Consumers Consumers almost never see a GTIN and benefit from it constantly. Price accuracy at the till, product comparison across retailers, allergen and ingredient information that corresponds to the item actually held, recall notices that reach the right products, and a scan that returns information about this product rather than a generic category page. Each of those is a downstream consequence of one number meaning the same thing everywhere. ## Common Misconceptions **"A GTIN is a barcode."** The barcode is a printed symbol that carries the number. Remove the barcode and the GTIN persists in every system that recorded it. **"UPC, EAN and GTIN are three different standards."** They are one standard. UPC and EAN are historical names for the twelve and thirteen digit formats. **"The first digits show the country of manufacture."** They indicate the GS1 Member Organisation that licensed the prefix, which reflects where the company registered. **"Our internal SKU is effectively a GTIN."** It is not unique outside the organisation and carries no guarantee that any external party can interpret it. **"One product needs one GTIN."** One *trade item* needs one GTIN. A product sold as a single unit, a case and a multipack is three trade items. **"A GTIN identifies an individual item."** It identifies a class. Individual units require a serial number in addition. **"We can generate GTINs ourselves."** Numbers can be generated by anyone; the guarantee of uniqueness comes only from a licensed prefix, and that guarantee is the entire value. **"A GTIN means we are passport ready."** Identification is one prerequisite among several. Data completeness, maintenance and access control remain. ## Frequently Asked Questions #### Is a GTIN the same as a barcode? No. A GTIN is a number that identifies a trade item. A barcode is a data carrier: a way of printing that number so a machine can read it. The same GTIN can appear in a linear barcode, a DataMatrix, a QR code or an RFID tag without changing at all. #### What is the difference between GTIN, UPC and EAN? There is no difference in kind. GTIN is the current global term; UPC and EAN are historical names for the twelve and thirteen digit formats, now called GTIN-12 and GTIN-13. Treat GTIN as the field name in systems and the others as legacy vocabulary. #### When must a new GTIN be allocated? When a change is significant to trading partners or consumers, such as a change to what the product fundamentally is or to its declared net content. Minor changes such as artwork refreshes generally do not require one. GS1 publishes an allocation standard covering the specific cases, and following it consistently matters more than the judgement in any single instance. #### Do we need a GTIN for a Digital Product Passport? Legislation requires a data carrier linked to a unique product identifier; it does not name a scheme. A GTIN is a widely recognised way to meet that requirement and is often already in place, but sectors with established identification frameworks may use those. The applicable delegated act for your product group is the document that decides. #### Can a GTIN identify an individual unit? Not on its own. A GTIN identifies a trade item class. To identify one physical unit, the GTIN is combined with a serial number; to identify a production run, with a batch or lot number. GS1 Digital Link provides a defined way to express those qualifiers alongside the GTIN. #### What happens if two products end up with the same GTIN? Systems that key on the identifier will conflate them, producing incorrect prices, inventory and compliance records. Duplicates almost always originate from poor internal allocation records rather than from the standard. The remedy is a single authoritative register of issued numbers with a named owner. #### Where should a team start? Confirm which of your products are trade items and at which packaging levels, establish whether your organisation already holds a licensed prefix, and audit whether issued numbers are recorded authoritatively. Only then move on to carriers, Digital Link and passport publication. ## Key Takeaways * A GTIN is a globally unique number identifying a trade item. It is the identifier, not the barcode that carries it. - Uniqueness is structural: licensed company prefixes make collisions impossible without any central product registry. - UPC and EAN are historical names for GTIN-12 and GTIN-13. One standard, four formats, not four standards. - Store every GTIN as fourteen digits with leading zeros to avoid an entire family of matching failures. - A GTIN identifies a class of trade item; serial and batch numbers narrow it to a unit or a production run. - A GTIN is not an SKU: global and governed versus internal and disposable. Maintain a deliberate mapping between them. - GS1 Digital Link makes a GTIN web native without changing the number, letting one symbol serve several audiences. - A Digital Product Passport may use a GTIN as its product identity, but identification is a prerequisite, not the whole obligation. ## Related Articles * [What is GS1?](/docs/knowledge-base/standards-and-technology/what-is-gs1) * [QR Codes vs GS1 Digital Link: What's the Difference?](/docs/knowledge-base/standards-and-technology/qr-codes-vs-gs1-digital-link) * [What is a Product Identifier?](/docs/knowledge-base/standards-and-technology/what-is-a-product-identifier) * [What is GS1 Digital Link?](/docs/knowledge-base/standards-and-technology/what-is-gs1-digital-link) * [What is a Data Carrier?](/docs/knowledge-base/standards-and-technology/what-is-a-data-carrier) * [How Product Data Moves Through the Supply Chain](/docs/knowledge-base/standards-and-technology/how-product-data-moves-through-the-supply-chain) * [What is EPCIS?](/docs/knowledge-base/standards-and-technology/what-is-epcis) * [How Will Digital Product Passports Change Product Compliance?](/docs/knowledge-base/standards-and-technology/how-will-digital-product-passports-change-product-compliance) ## Related Glossary Terms Definitions of record for the terms used above live in the [glossary](/docs/knowledge-base/glossary/overview). * [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) * [QR Code](/docs/knowledge-base/glossary/qr-code) * [Digital Product Passport](/docs/knowledge-base/glossary/digital-product-passport) * [Product Data](/docs/knowledge-base/glossary/product-data) * [Product Traceability](/docs/knowledge-base/glossary/product-traceability) * [Product Lifecycle](/docs/knowledge-base/glossary/product-lifecycle) * [Economic Operator](/docs/knowledge-base/glossary/economic-operator) * [Market Surveillance](/docs/knowledge-base/glossary/market-surveillance) * [Conformity Assessment](/docs/knowledge-base/glossary/conformity-assessment) * [Delegated Act](/docs/knowledge-base/glossary/delegated-act) * [ESPR](/docs/knowledge-base/glossary/espr) * [Sustainability Data](/docs/knowledge-base/glossary/sustainability-data) * [Circular Economy](/docs/knowledge-base/glossary/circular-economy) ## References * GS1 GTIN, the primary reference for the Global Trade Item Number: [https://www.gs1.org/standards/id-keys/gtin](https://www.gs1.org/standards/id-keys/gtin) * GS1 identification keys, covering GTIN and the other GS1 keys: [https://www.gs1.org/standards/id-keys](https://www.gs1.org/standards/id-keys) * GS1 GTIN management standard, the allocation rules governing when a new GTIN is required: [https://www.gs1.org/1/gtinrules/en/](https://www.gs1.org/1/gtinrules/en/) * GS1 General Specifications, defining key structures, check digit calculation, carriers and application identifiers: [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 company prefix and identification licensing: [https://www.gs1.org/standards/id-keys/company-prefix](https://www.gs1.org/standards/id-keys/company-prefix) * GS1 Digital Link standard, expressing identification keys as structured web addresses: [https://www.gs1.org/standards/gs1-digital-link](https://www.gs1.org/standards/gs1-digital-link) * GS1 barcodes, covering the symbologies that carry GTINs: [https://www.gs1.org/standards/barcodes](https://www.gs1.org/standards/barcodes) * GS1, the global standards organisation: [https://www.gs1.org](https://www.gs1.org) * International Organization for Standardization, ISO/IEC 15420 on EAN/UPC bar code symbology: [https://www.iso.org/standard/84892.html](https://www.iso.org/standard/84892.html) * International Organization for Standardization, ISO/IEC 15459 on unique identification: [https://www.iso.org/standard/54779.html](https://www.iso.org/standard/54779.html) * International Organization for Standardization: [https://www.iso.org](https://www.iso.org) * Regulation (EU) 2024/1781 establishing a framework for the setting of ecodesign requirements for sustainable products, including the Digital Product Passport, unique product identifier and data carrier provisions, Official Journal of the European Union: [https://eur-lex.europa.eu/eli/reg/2024/1781/oj](https://eur-lex.europa.eu/eli/reg/2024/1781/oj) * Regulation (EU) 2023/1542 concerning batteries and waste batteries, including battery passport identifier provisions, Official Journal of the European Union: [https://eur-lex.europa.eu/eli/reg/2023/1542/oj](https://eur-lex.europa.eu/eli/reg/2023/1542/oj) * Regulation (EU) 2017/745 on medical devices, including the unique device identification system, Official Journal of the European Union: [https://eur-lex.europa.eu/eli/reg/2017/745/oj](https://eur-lex.europa.eu/eli/reg/2017/745/oj) * European Commission, Ecodesign for Sustainable Products Regulation: [https://commission.europa.eu/energy-climate-change-environment/standards-tools-and-labels/products-labelling-rules-and-requirements/ecodesign-sustainable-products-regulation\_en](https://commission.europa.eu/energy-climate-change-environment/standards-tools-and-labels/products-labelling-rules-and-requirements/ecodesign-sustainable-products-regulation_en) * EUR-Lex, official portal for European Union law: [https://eur-lex.europa.eu](https://eur-lex.europa.eu) ## About This Article About This Article
Last Reviewed
2026-08-07
Next Scheduled Review
2027-08-07
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) * [What is a Product Identifier?](/docs/knowledge-base/standards-and-technology/what-is-a-product-identifier) * [What is GS1?](/docs/knowledge-base/standards-and-technology/what-is-gs1) * [What is GS1 Digital Link?](/docs/knowledge-base/standards-and-technology/what-is-gs1-digital-link) * [QR Codes vs GS1 Digital Link: What's the Difference?](/docs/knowledge-base/standards-and-technology/qr-codes-vs-gs1-digital-link) * [What is a Digital Product Passport?](/docs/knowledge-base/digital-product-passports/what-is-a-digital-product-passport) * [What is Product Master Data?](/docs/knowledge-base/enterprise-systems-and-data-architecture/what-is-product-master-data) * [How Conformity Assessment Works for Digital Product Passports](/docs/knowledge-base/regulations/how-conformity-assessment-works-for-digital-product-passports)