# GTIN > GS1's globally unique product number behind EAN and UPC barcodes. Also known as: Global Trade Item Number, EAN, UPC. Category: E-commerce and workflow. The Global Trade Item Number (GTIN) is a globally unique product identifier managed by GS1. It is encoded in EAN and UPC barcodes on retail packaging and used by retailers and marketplaces to identify products. ## How PhotoRobot uses it PhotoRobot exports can put the GTIN into file names through the export template, as GS1-compliant retailers require; see [GS1 image standards](https://www.photorobot.com/gs1-image-standards). ## Related terms - [Barcode](https://www.photorobot.com/glossary/barcode): A machine-readable code on a product or label, scanned to identify items without typing. - [GS1 image standards](https://www.photorobot.com/glossary/gs1-image-standards): GS1 guidelines for how product images are captured, named and exchanged in retail supply chains. - [SKU (stock keeping unit)](https://www.photorobot.com/glossary/sku): A retailer's internal code for one distinct product variant. ## Where this term appears on photorobot.com Mentioned on 2 pages. Most relevant: - [Using AI to Enhance Product Photo Backgrounds](https://www.photorobot.com/blog/enhancing-product-photo-backgrounds): The prompt can fetch the fragrance name, collection name, and an EAN code for each item. - [A Quick Guide to 360 Product Photography for Amazon](https://www.photorobot.com/blog/360-degree-product-photography-amazon): …mode File names must consist of the product identifier (Amazon ASIN, 13-digit ISBN, EAN, JAN, or UPC) followed by a period and the appropriate file extension (Example: B000123456.jpg or 0237425673485.