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Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →A GTIN is a number that identifies a trade item in commerce. UPC and EAN usually name particular GTIN formats, while ISBN is the identifier system for books. A barcode is the scannable symbol that carries a number—not the number itself.
GTIN, UPC, EAN, and ISBN at a glance
| Term | What it identifies or means | Digits or format | How it relates to a barcode |
|---|---|---|---|
| GTIN | A GS1 identification key for a trade item that can be priced, ordered, or invoiced in a supply chain. | Available in GTIN-8, GTIN-12, GTIN-13, and GTIN-14 formats. | The number can be represented in a suitable barcode symbol. |
| UPC | Common name for GTIN-12; mostly used in North America. | 12 digits | UPC-A is a barcode symbol that carries a GTIN-12. |
| EAN | Common name for GTIN-13; also called JAN in some contexts. Mostly used in Europe and other regions. | 13 digits | EAN-13 is a barcode symbol that carries a GTIN-13. |
| ISBN | The international standard system for identifying books. | Not stated as a single digit length in the cited GS1 explanation. | An ISBN can be represented in a GTIN-13-compatible structure in an EAN-13 barcode. |
| Barcode | A data carrier or symbol that a scanner reads. | Varies by symbol and the data it carries. | It is not itself the identifier number. |
GS1 describes GTIN-8 as a format used for smaller items and GTIN-14 as a format used for cases and packaging. The names UPC and EAN are useful shorthand, but the GTIN format is the more precise way to describe the identifier’s digit structure. GS1’s terminology guide explains the common naming and regional conventions.
What a GTIN identifies
GS1 defines a trade item as a product or service that may be priced, ordered, or invoiced in a supply chain. Each distinct trade item receives its own GTIN, allowing businesses and systems to refer to that item consistently. The number functions as an identification key; it does not, by itself, contain a readable product description or price. GS1’s GTIN overview describes the role of the number in commerce.
Why a barcode is not the same thing as a GTIN
A GTIN is the identifier. A barcode is one way to encode and carry it so a scanner can read it. For example, a UPC-A symbol carries a GTIN-12, and an EAN-13 symbol carries a GTIN-13. GS1 notes that EAN-13 and UPC-A are the most widely used barcode symbols for trade-item identification. GS1’s barcode explanation distinguishes the symbol from the identifier.
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When a scanner reads the symbol, software can use the number to look up a product record. Product descriptions and prices generally come from a database rather than being encoded as plain-language information in the digits. The number alone also does not reliably reveal where a product was manufactured or verify a seller, authenticity, or a complete product record. GS1 explains what a GTIN does and does not tell you, and its barcode information describes barcode use.
How an ISBN relates to GTIN and EAN
An ISBN identifies a book under the International Standard Book Number system. It is not simply another general name for UPC or EAN. Under an agreement between the GS1 and ISBN organisations, an ISBN can be transformed into a GTIN-13-compatible structure and represented in an EAN-13 barcode. That connection lets the book identifier be handled in barcode systems without changing the ISBN’s purpose as a book identifier. See GS1’s explanation of ISBN.
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What the digits mean—and what they cannot tell you
In GTIN-12 and GTIN-13, the number is structured from a company prefix, an item reference, and a check digit. A GS1 Member Organisation licenses the prefix; the user company assigns the item reference; and the check digit helps verify that the number is structurally valid. The current technical rules are set out in the GS1 General Specifications, Release 26.0, ratified January 2026.
Although the parts have defined roles, the full digit string is not a plain-language code that anyone can decode into a product name or manufacturing country. A database lookup is needed for product information, and a structurally valid check digit is not proof that a particular item or seller is genuine.
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Which term should you use?
- Use GTIN when referring generally to the trade-item identifier or when the exact format is not the point.
- Use GTIN-12 or UPC for a 12-digit identifier; use UPC-A when you mean the barcode symbol.
- Use GTIN-13 or EAN for a 13-digit identifier; use EAN-13 when you mean the barcode symbol.
- Use ISBN for the identifier system used for books.
- Use barcode for the scannable symbol, not as a synonym for the number printed below or associated with it.
If you are entering a product identifier into a catalogue or marketplace, follow that form’s requested field and format. A request for a GTIN is broader than a request for a UPC or EAN label, because GTIN includes multiple digit formats.
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