# gtin

A Global Trade Item Number ([GTIN](https://www.gs1.org/standards/id-keys/gtin)). GTINs identify trade items, including products and services, using numeric identification codes.

A correct [gtin](https://schema.org.ai/gtin) value should be a valid GTIN, which means that it should be an all-numeric string of either 8, 12, 13 or 14 digits, or a "GS1 Digital Link" URL based on such a string. The numeric component should also have a [valid GS1 check digit](https://www.gs1.org/services/check-digit-calculator) and meet the other rules for valid GTINs. See also [GS1's GTIN Summary](http://www.gs1.org/barcodes/technical/idkeys/gtin) and [Wikipedia](https://en.wikipedia.org/wiki/Global_Trade_Item_Number) for more details. Left-padding of the gtin values is not required or encouraged. The [gtin](https://schema.org.ai/gtin) property generalizes the earlier [gtin8](https://schema.org.ai/gtin8), [gtin12](https://schema.org.ai/gtin12), [gtin13](https://schema.org.ai/gtin13), and [gtin14](https://schema.org.ai/gtin14) properties.

The GS1 [digital link specifications](https://www.gs1.org/standards/Digital-Link/) expresses GTINs as URLs (URIs, IRIs, etc.). Digital Links should be populated into the [hasGS1DigitalLink](https://schema.org.ai/hasGS1DigitalLink) attribute.

Note also that this is a definition for how to include GTINs in Schema.org data, and not a definition of GTINs in general - see the GS1 documentation for authoritative details.

## Expected Types

| Type | Description |
|------|-------------|
| [Text](https://schema.org.ai/Text) | Data type: Text. |
| [URL](https://schema.org.ai/URL) | Data type: URL. |

## Used on Types

| Type | Description |
|------|-------------|
| [Demand](https://schema.org.ai/Demand) | A demand entity represents the public, not necessarily binding, not necessarily exclusive, announcement by an organization or person to seek a certain type of goods or services. For describing demand using this type, the very same properties used for Offer apply. |
| [Offer](https://schema.org.ai/Offer) | An offer to transfer some rights to an item or to provide a service — for example, an offer to sell tickets to an event, to rent the DVD of a movie, to stream a TV show over the internet, to repair a motorcycle, or to loan a book. Note: As the [businessFunction](https://schema.org.ai/businessFunction) property, which identifies the form of offer (e.g. sell, lease, repair, dispose), defaults to [http://purl.org/goodrelations/v1#Sell](http://purl.org/goodrelations/v1#Sell); an Offer without a defined businessFunction value can be assumed to be an offer to sell. For [GTIN](http://www.gs1.org/barcodes/technical/idkeys/gtin)-related fields, see [Check Digit calculator](http://www.gs1.org/barcodes/support/check_digit_calculator) and [validation guide](http://www.gs1us.org/resources/standards/gtin-validation-guide) from [GS1](http://www.gs1.org/). |
| [Product](https://schema.org.ai/Product) | Any offered product or service. For example: a pair of shoes; a concert ticket; the rental of a car; a haircut; or an episode of a TV show streamed online. |

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Quoted from Schema.org 30.1, https://schema.org/gtin, under CC BY-SA 3.0. Served by the Org.AI Foundation at https://schema.org.ai/gtin.