← Blogby Marcell Almeida

How to validate GTIN, EAN-13, and UPC barcodes

Enter a barcode number — verify check digit and GTIN format instantly.

Marketplaces reject listings with invalid barcodes. The GTIN Validator checks EAN-13, UPC-A, and GTIN-14 check digits before you submit a product feed.

Try it — enter GTIN or barcode

Open full tool →

How it works

  1. Enter barcode — digits only or with spaces.
  2. Validation — check digit and length verified.
  3. Format — identified as UPC, EAN, or GTIN-14.

Check digit algorithm

GTIN uses modulo-10 check digits. A single typo fails validation — catch it before Amazon or Google Merchant Center does.

Pricing

Model sale prices with the Shopify Discount Calculator.

The How to validate GTIN, EAN-13, and UPC barcodes is free, runs locally, and never sends your data to a server. More e-commerce calculators at maratool.com.