GTIN stands for Global Trade Item Number. In Google Merchant Center, the gtin attribute supplies the standardized product identifier assigned to the item.
A GTIN is different from your store’s internal product ID or SKU. Entering an internal reference in the GTIN field does not turn it into a valid global identifier.
Why the distinction matters
Your internal product ID helps your systems recognize a record. A GTIN identifies a trade item through a standardized scheme.
A retailer may have its own SKU for a branded product while the manufacturer-assigned identifier remains the same.
Keeping those fields separate makes it easier to trace a product from supplier records to the store and Merchant Center.
Where to find a GTIN
Check manufacturer or supplier information and the product’s genuine packaging.
Make sure the identifier belongs to the exact product and variant. A different size, color, pack quantity, or model may need a different value.
Do not copy an identifier from a visually similar item just to fill the field.
How to submit it
Use the gtin attribute in the relevant product source or the corresponding supported integration field.
Preserve the identifier accurately during export and spreadsheet handling. Formatting changes can alter a value before it reaches Google.
Compare the received value with the trusted source when investigating a warning.
What if the product has no GTIN?
Do not invent one and do not assume that every product without a supplied value legitimately has no identifier.
Investigate whether the manufacturer assigned an identifier and review Google’s requirements for that product.
The identifier_exists attribute has a specific meaning. Google publishes an issue explanation for products marked as lacking identifiers when it believes a GTIN exists.
Troubleshooting an incorrect identifier
Record the affected product ID, submitted GTIN, brand, model, and variant.
Check for a copied value, mismatched pack, source mapping error, or spreadsheet conversion. Correct the source controlling the field and verify the processed update.
If the issue persists despite reliable evidence, use the relevant support route with that evidence.
Frequently asked questions
Is a GTIN the same as a SKU?
No. A SKU is generally an internal stock reference.
Can I generate a random number?
No. An invented value is not a legitimate product identifier.
Can I use a competitor’s listing to guess it?
Use reliable manufacturer or supplier evidence for the exact item.
Will a correct GTIN guarantee visibility?
No. It is one part of accurate product data, not a guarantee of exposure or sales.
Related reading
What Is Google Merchant Center? A Beginner’s Guide
How to Fix a Google Merchant Center Suspension
Official sources
https://support.google.com/merchants/answer/6324461?hl=en
https://support.google.com/merchants/answer/160161?hl=en