When managing a product feed in Google Merchant Center, few attributes are as important as the GTIN. Alongside brand and MPN, the GTIN is one of Google’s core product identifiers, helping match your products accurately to relevant shopper searches.
If your GTIN data is missing or incorrect, it can lead to feed errors, reduced visibility, or disapproved products. That’s why understanding how GTINs work and which identifier applies to your products is essential for effective Google Shopping feed optimization.
What Is a GTIN?
A Global Trade Item Number (GTIN) is a standardized product identifier used worldwide. While the term “GTIN” is universal, the actual format varies depending on where the product is manufactured or sold.
Google accepts several identifier formats under the GTIN attribute, as long as the number is valid and properly registered.
Common GTIN Formats by Region
United States and Canada: In the U.S. and Canada, a GTIN is typically a UPC (Universal Product Code). UPCs are 12-digit numbers commonly found beneath barcodes on retail packaging.
Europe and International Markets: Outside North America, GTINs are often represented as EANs (European Article Numbers). Most EANs are 13 digits, though some products may use 8- or 14-digit variations.
Japan: In Japan, the GTIN may be a JAN (Japanese Article Number). JAN codes are either 8 or 13 digits and function similarly to UPCs and EANs.
In all of these cases, the GTIN is usually printed alongside a barcode on the product or its packaging.
GTINs for Books
For published books, Google allows the ISBN (International Standard Book Number) to be used as the GTIN.
- Books published before 2007 typically use a 10-digit ISBN
- Modern ISBNs are 13 digits, starting with 978 or 979
ISBNs are accepted globally and apply specifically to commercially published books.
Why GTIN Accuracy Matters
Correct GTINs help Google:
- Match products to the right search queries
- Improve ad relevance and visibility
- Reduce feed errors and product disapprovals
From a performance standpoint, accurate GTIN data supports stronger Google Shopping ads, better reporting, and more consistent approval across product catalogs.
How TryAds Helps
At TryAds, we treat product feeds as performance assets, not just technical requirements. Our team audits, cleans, and optimizes GTIN data across Google Merchant Center to ensure products are properly identified, approved, and positioned to compete.
Whether you’re dealing with missing identifiers, catalog inconsistencies, or international feed expansion, we help brands build feeds that scale efficiently and compliantly.