What Is a GTIN? The Complete Guide to Global Trade Item Numbers

Key Takeaways

• GTIN stands for Global Trade Item Number, the universal product identifier used across barcodes, marketplaces, and supply chains worldwide 

• There are four GTIN formats: GTIN-8, GTIN-12 (UPC), GTIN-13 (EAN), and GTIN-14, each used in different contexts 

• GTINs are issued by GS1, the global standards body. Buying codes from third-party resellers risks listing suppression on Amazon and Google Shopping 

• Retailers who add correct GTINs see a 20% increase in clicks on average, according to Google 

• Missing or invalid GTINs get products delisted from Amazon, suppressed on Google Shopping, and rejected by major retail feeds 

• A PIM system manages GTINs at scale by validating formats, flagging missing codes, and keeping product data channel-ready 

What Is a GTIN?

A GTIN (Global Trade Item Number) is a unique numeric identifier assigned to a specific product. It was developed and is maintained by GS1, the international nonprofit organization that sets global standards for supply chain and product identification.

The number itself encodes the company that makes the product (via a GS1 Company Prefix) and that company’s specific product reference. Every GTIN ends with a check digit, a calculated value used to verify the code has not been corrupted or entered incorrectly. 

GTINs live inside barcodes. The barcode is a machine-readable visual representation of the GTIN, but the number is what actually carries the data. When a barcode is scanned at a point of sale or read by a warehouse scanner, what gets transmitted is the GTIN. 

In eCommerce, GTINs appear in product listings, data feeds, and marketplace catalogs. They are what lets Amazon, Google Shopping, Walmart, and eBay know that a product being listed is the exact same product they already have data for. That match enables them to pull in accurate product descriptions, images, pricing benchmarks, and customer reviews. 

The 4 GTIN Formats Explained

GTIN is an umbrella term that covers four distinct formats. The format used depends on the type of product, the sales channel, and the region. 

GTIN-8 

GTIN-8 is the shortest format, used when physical packaging is too small for a standard barcode (think lip balm, small stationery items, or individual portions). It is far less common than GTIN-12 or GTIN-13 and requires a specific application to GS1 to use. 

GTIN-12 (UPC) 

GTIN-12 is what most people in the US know as a UPC (Universal Product Code). It is the standard 12-digit barcode used across North American retail. If you are selling physical products in the US, GTIN-12 is the format you will encounter most. For more on how UPCs work and how they relate to GTINs, see the What is a UPC? guide. 

GTIN-13 (EAN) 

GTIN-13 corresponds to the EAN-13 barcode, the 13-digit format used outside North America. If you are selling internationally or listing products on European marketplaces, GTIN-13 is the relevant format. The What is an EAN? guide covers this format in detail. 

GTIN-14 

GTIN-14 is used for trade units: cases, pallets, and cartons rather than individual consumer products. It is the format used in wholesale, B2B supply chains, and logistics operations where items ship and store in bulk packaging. 

GTIN vs UPC vs EAN vs SKU

These terms get used interchangeably in eCommerce, and the confusion is understandable. Here is how they relate: 

• GTIN is the overarching standard. UPC and EAN are both types of GTIN. 

• UPC (GTIN-12) is the 12-digit barcode format used in North America. 

• EAN (GTIN-13) is the 13-digit barcode format used internationally. 

• SKU is an internal identifier created by the seller. It is not standardized or recognized outside the seller’s own systems. Two different companies can use the same SKU number for completely different products. A GTIN is globally unique; an SKU is not. 

The practical takeaway: SKUs help you manage inventory internally. GTINs help the rest of the world identify your products accurately, including marketplaces, retailers, logistics partners, and AI agents. 

For more context on how GTINs connect to GS1’s broader standards framework, see Who Are GS1 and Why Are They Important? 

Why GTINs Matter for eCommerce 

GTINs are not a bureaucratic requirement. They are the mechanism that makes product data interoperable across every channel a modern seller operates in. 

On Google Shopping, the impact of valid GTINs is well-documented. Google’s own Merchant Center documentation confirms that retailers who add correct GTINs see a 20% increase in clicks on average. The reason is straightforward: Google uses GTINs to match listings against its own product knowledge graph, which lets it pull in accurate titles, images, and review data. Products without GTINs cannot benefit from that matching and are treated as lower-quality listings. 

On Amazon, GTIN requirements are even stricter. Amazon Seller Central requires that GTINs come directly from GS1. Codes obtained from third-party resellers are not accepted and can result in listing suppression or account-level penalties. For sellers managing product catalogs across Amazon’s global marketplaces, a single invalid or mismatched GTIN can cause a product to be de-listed entirely. 

Walmart Marketplace and eBay have similar requirements. Walmart requires GTINs for all product listings and uses them to match products against its existing item catalog. eBay requires GTINs for most new listings in structured categories. 

The pattern is consistent across channels: valid GTINs mean better visibility, more accurate listings, and fewer feed rejections. Invalid or missing GTINs mean suppressed listings, lower ad performance, and time spent troubleshooting feed errors.

How to Get a GTIN from GS1

GTINs must be obtained through GS1, either directly through GS1 US (for US-based companies) or through your country’s GS1 member organization. There is no legitimate shortcut. 

Step 1: Apply for a GS1 Company Prefix 

The GS1 Company Prefix is the number that identifies your business within the GS1 system. All GTINs your company issues will begin with this prefix. You apply for it at GS1 US and pay an annual license fee that scales based on how many GTINs you need. 

Step 2: Assign GTINs to Your Products 

Once you have a Company Prefix, you assign a unique product reference number to each of your products. Combined with the prefix and a calculated check digit, this creates a valid GTIN for each SKU. 

Step 3: Register Your Products in the GS1 Registry 

GS1 offers a product registry where you can register your GTINs and associated product data. This is not mandatory but is strongly recommended, as it allows retailers and marketplaces to verify that the GTIN you are using belongs to you and matches your product. 

Step 4: Validate Before Publishing to Channels 

Before sending GTINs to any marketplace or retailer feed, validate that each code has the correct digit count for its format, that the check digit is accurate, and that the GTIN has not been assigned to a different product. Feed validation catches these issues before they reach a marketplace and cause a listing rejection. 

A note on third-party GTIN sellers: Sites that sell GTIN codes in bulk at low prices are selling recycled or resold codes that were previously registered to other products. Amazon and major retailers check GTINs against the GS1 registry, and a GTIN that resolves to a different product will get a listing rejected or suppressed. The only safe source is GS1 directly. 

Common GTIN Errors and How to Fix Them 

GTIN errors are one of the most common causes of feed rejections and listing suppression across Amazon, Google Shopping, and Walmart. Here are the errors that come up most often and what to do about them. 

Invalid Check Digit 

Every GTIN ends with a calculated check digit. If the check digit does not match the formula applied to the preceding digits, the GTIN fails validation immediately. This often happens when GTINs are entered manually or when a digit is transposed during data entry. The fix is to recalculate the check digit using GS1’s check digit calculator and correct the record. 

GTIN Already Assigned to a Different Product 

This error appears when a GTIN you are using is registered in the GS1 registry under a different company or product. It is the most common consequence of buying GTINs from third-party resellers. The only resolution is to obtain a correctly issued GTIN from GS1 and update all affected listings. 

Wrong GTIN Format for the Channel 

Some channels have format-specific requirements. Amazon US typically expects GTIN-12 (UPC) for US products. European marketplaces typically expect GTIN-13 (EAN). Submitting the wrong format or a GTIN of the wrong digit length will cause the feed to reject the listing. Check each channel’s specific requirements before building your feed. 

GTIN Exemptions 

Not all products require a GTIN. GS1 and Amazon both provide exemption pathways for product categories where GTINs are not standard, including handmade items, custom products, private label goods, and certain vintage or collectible categories. Sellers in these categories can apply for a GTIN exemption, which allows them to list without a standard barcode. However, GTIN-exempt listings are typically excluded from Google Shopping’s product knowledge graph matching, which limits their visibility compared to GTIN-enabled listings.

GTINs and Agentic Commerce

A growing share of product discovery now happens through AI. According to a 2026 study reported by Search Engine Land, 37% of consumers now begin their searches with AI tools rather than traditional search engines. That shift has direct implications for how product data needs to be structured, and GTINs are central to that. 

AI shopping agents that can browse, compare, and recommend products autonomously rely on structured product feeds to evaluate options. A GTIN is one of the primary anchors those systems use to identify and cross-reference a product across sources. A product without a valid GTIN is harder for an AI agent to match to existing product data, reviews, and pricing signals, making it a weaker candidate in an AI-generated recommendation. 

The same principle that has always applied to Google Shopping now applies to AI-driven discovery: accurate, complete, structured product data is what makes a product visible. GTINs are a foundational part of that structure. For teams thinking about what types of product information matter most in a structured data feed, GTIN accuracy belongs at the top of the list. 

How a PIM Manages GTINs at Scale

For a business selling tens or hundreds of thousands of SKUs, GTIN management is not a task that can be handled in spreadsheets. The volume, the number of channels, and the cost of a single feed error all make manual processes impractical. 

A Product Information Management (PIM) system centralizes all product data, including GTINs, in one place and manages the workflow around it. In practice, that means: 

• Flagging missing GTINs during product onboarding, before incomplete records are ever pushed to a channel 
• Validating GTIN format and check digit automatically, catching data entry errors at the source 
• Preventing duplicate GTIN assignment across a catalog, a problem that becomes common at scale without a centralized system 
• Mapping GTINs to the right format for each channel (GTIN-12 for Amazon US, GTIN-13 for European channels) and handling any format conversion in the feed 
• Maintaining a single source of truth for GTIN data that syncs to every downstream channel, so a correction made once in the PIM propagates everywhere 

 For manufacturers and distributors managing product data across multiple retailers, distributors, and international marketplaces, this kind of automation is what makes GTIN compliance manageable at scale. Manually tracking GTINs across spreadsheets and individual channel feeds is where errors accumulate and listings get suppressed. 

Pimberly’s PIM platform is built to handle exactly this workflow. GTIN validation is part of the data onboarding process, and channel-specific feed rules ensure the right format reaches the right destination without manual intervention. 

FAQs

Q: What does GTIN stand for? 
A: GTIN stands for Global Trade Item Number. It is the standardized identifier used to uniquely identify products across global supply chains, barcodes, and digital marketplaces. 

Q: What is the difference between a GTIN and a UPC? 
A: A UPC (Universal Product Code) is a type of GTIN, specifically GTIN-12, the 12-digit format used in North American retail. All UPCs are GTINs, but not all GTINs are UPCs. The other GTIN formats (GTIN-8, GTIN-13, GTIN-14) serve different product types and regions. 

Q: Do I need a GTIN to sell on Amazon? 
A: Yes, in most product categories. Amazon requires GTINs for new product listings and specifies that codes must come from GS1 directly. Codes obtained from third-party resellers are not accepted and can result in listing rejection or account penalties. Some categories qualify for GTIN exemptions; Amazon’s Seller Central provides guidance on which categories are eligible. 

Q: How do I get GTINs for my products?
A: They are issued by GS1, the global standards organization. Businesses can apply through their local GS1 office.

Q: What are GTIN exemptions? 
A: GTIN exemptions allow sellers in specific categories to list products without a standard GTIN. Exemptions are typically available for handmade items, custom or one-of-a-kind products, private label 

The bottom line for GTIN management

GTINs are the backbone of modern product identification. They are what lets a single product be recognized consistently across Amazon, Google Shopping, Walmart, eBay, and any AI-powered shopping agent that evaluates structured product feeds. Get them right and you unlock better listing eligibility, higher click-through rates, and cleaner data across every channel you sell on. Get them wrong and the consequences are immediate: rejected feeds, suppressed listings, and products that simply do not show up. 

For individual sellers with small catalogs, managing GTINs manually is workable. For manufacturers and distributors operating at scale across hundreds of SKUs, multiple markets, and dozens of retail and marketplace relationships, manual GTIN management is a liability. 

Pimberly is built to remove that liability. GTIN validation, format mapping, and channel-ready feed management are core to how the platform works, giving product data teams one place to manage identifiers accurately, at scale, without the risk of feed errors reaching live channels.