UPC / EAN Validator

Verify global trade item numbers (UPC, EAN, GTIN) check digits.

Enter Barcode Number

Supports UPC-A (12), EAN-13, EAN-8, and GTIN-14 formats.

Logic: UPCs and EANs use a modulo-10 calculation where digits are weighted by 3 or 1 depending on their position. This is different from the Luhn algorithm used for credit cards.