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GTIN vs UPC: What's the Difference?
Two terms used interchangeably, but they mean different things. Here is the clear breakdown.
GTIN (Global Trade Item Number) is the universal product identifier — the number itself. UPC (Universal Product Code) is the specific 12-digit barcode format used to encode a GTIN in North America. Think of GTIN as the data, UPC as the data carrier.
All UPCs are GTINs (specifically GTIN-12s). But not all GTINs are UPCs — EAN-13 is GTIN-13, ITF-14 is GTIN-14, EAN-8 is GTIN-8. The GTIN family is the umbrella; UPC is one specific format within it.
Bottom line
If someone asks for your 'GTIN,' your UPC-A works — it's a GTIN-12. If you sell in North America only, UPC-A is sufficient. If you sell internationally or want to future-proof, register an EAN-13 (GTIN-13). Both come from the same GS1 system.
GTIN vs UPC: side-by-side
| GTIN | UPC | |
|---|---|---|
| Definition | Universal product identifier (the number) | 12-digit barcode format (the data carrier) |
| Length | 8, 12, 13, or 14 digits | Always 12 digits |
| Family | Umbrella term (GTIN-8/12/13/14) | Specific subset (= GTIN-12) |
| Geography | Worldwide | Primarily North America |
| Issued by | GS1 (all variants) | GS1 US (gs1us.org) |
| Internal storage | Retailers store as GTIN-14 (zero-padded) | Converted to GTIN-14 when stored |
| Amazon usage | Amazon's API field is called 'GTIN' but accepts UPC/EAN/ISBN | Accepted as a GTIN-12 |
| Google Shopping | 'gtin' attribute required for most products | Submitted under the 'gtin' attribute |
Why two terms for the same idea
Historical accident. The UPC was invented in 1973 (US). The EAN-13 was created in 1976 (Europe) by extending UPC with a country prefix. GS1 unified everything in 2005 with the GTIN umbrella — every barcode format became a specific GTIN length. UPC-A → GTIN-12. EAN-13 → GTIN-13. ITF-14 → GTIN-14. EAN-8 → GTIN-8. The old format names persisted because everyone in retail still uses them daily.
How to convert a UPC to a GTIN-14
Internal retailer systems store every code as a 14-digit GTIN. To convert UPC-A (12 digits) to GTIN-14: prepend two zeros. Example: UPC-A 012345678905 → GTIN-14 00012345678905. EAN-13 → GTIN-14: prepend one zero. ITF-14 → GTIN-14: already 14 digits, no conversion needed.
When to use each term
Use 'UPC' when speaking to retailers, consumers, or anyone in North American retail. Use 'GTIN' in technical/API contexts — Amazon's Seller Central API field is called 'gtin', Google Merchant Center calls it 'gtin', and supply-chain systems standardize on GTIN. The product is the same; the vocabulary differs by audience.
FAQ
Is GTIN a 14-digit number?
GTIN comes in four lengths: 8 (EAN-8), 12 (UPC-A), 13 (EAN-13), and 14 (ITF-14). Retailers' internal databases typically store every GTIN as 14 digits with leading zeros. So technically a 12-digit UPC is also a GTIN-14 (with two leading zeros) when stored in retail systems.
What is the difference between UPC and GTIN on Amazon?
Amazon's API field is named 'gtin' but accepts UPC, EAN, and ISBN values. When you enter a UPC-A in Seller Central, Amazon stores it internally as a GTIN-14. Functionally identical for your listing purposes.
Can I make my own GTIN?
Not legitimately. To create real GTINs, you need a GS1 Company Prefix — apply at gs1us.org (US) or your country's GS1 affiliate. GS1 assigns you a prefix; you create GTINs within that prefix's namespace. Self-generated 'GTINs' without a real prefix won't pass Amazon, Walmart, or Google Shopping verification.
Why do I need a GTIN?
Almost every online marketplace and retailer requires GTINs for new product listings. Google Shopping's 'gtin' attribute is required for most categories. Amazon needs a GTIN (or GTIN Exemption approval) to create new ASINs. Without a real GTIN, your products are functionally invisible in modern retail.
Is a GTIN number the same as a UPC?
Closely related but not identical. GTIN is the umbrella term for the identifier; UPC is one specific 12-digit GTIN format. All UPCs are GTINs (specifically GTIN-12), but not all GTINs are UPCs — EAN-13s are also GTINs (GTIN-13).
How is a GTIN-14 different from a UPC?
GTIN-14 is the 14-digit format used in ITF-14 case codes — typically on shipping cartons, not retail units. A UPC-A is 12 digits and goes on individual retail products. A single retail GTIN-12 (UPC) can generate multiple GTIN-14 (ITF-14) case codes for different pack quantities using indicator digits 1-8.
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