GTIN Validator & Check Digit Calculator
Paste any GTIN-8/12/13/14 — instantly see whether it's valid, its check digit, and what each digit group encodes (indicator + GS1 company prefix + item reference). 100% client-side.
Validate a barcode
Generate a check digit
Enter your GS1 company prefix + item reference (without the final digit):
How the check digit works
Starting from the rightmost data digit, multiply alternately by 1 and 3, sum everything, and the check digit is what rounds the total up to the next multiple of 10.
GTINs are the product identifiers required by Amazon, Flipkart, Walmart and every major retailer, and they anchor the EU Digital Product Passport. If you export to the EU, your GTIN will be the key the DPP data carrier resolves against.
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