Do I Need a Different Barcode for Each Product Variation?
- Each product variation — such as size, color, or style — requires its own unique GTIN (UPC or EAN).
- Unique barcodes allow retailers to track inventory accurately and restock efficiently.
- Identical products sold in large quantities only need one barcode, even if you produce thousands or millions of units.
- Once assigned, a barcode stays with that exact product for its entire lifecycle.
Yes. You need a different barcode for every variation of a product. For example, if you sell a shirt in three sizes, you need three unique barcode numbers. This allows a store to see which size is selling faster and restock accordingly without performing manual inventory checks.
If the same shirt also comes in three colors, you would need nine total barcodes (3 sizes × 3 colors). Each variation is considered a separate product in retail and online marketplaces, so each must have its own GTIN.
What if I have many units of the same product?
If you produce a large quantity of one product — for example, one million identical 12 oz. water bottles — you only need one barcode number. You simply print that same barcode on all units of that single product.
How long does a barcode stay assigned to a product?
Each barcode stays assigned to its specific product for life. When you stop manufacturing that item, you must stop using that barcode. This prevents confusion in retail systems and keeps product data accurate. Many online POS systems permanently store item-barcode associations, meaning the same barcode cannot be reused for a different product in the future.
