GTIN Check Digit Validator
Check GTIN-8/12/13/14 and ISBN check digits, or calculate a missing check digit. Paste one code per line.
A QUICK WALKTHROUGH
How to use this tool
- Choose validation or missing-digit calculation.
- Paste one GTIN or ISBN code per line.
- Review each result and its computed check digit.
Supported formats
Validates GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13), GTIN-14, ISBN-13 and ISBN-10. Calculation mode accepts the data digits without the final check digit.
What a match means
A matching check digit confirms only mathematical consistency; it does not prove that GS1 or an ISBN agency issued the code or identify a product. UPC-E expansion, registration lookup, ownership, and product identification are not provided.
GOOD TO KNOW
Common questions
Does a valid check digit prove a barcode is genuine?
A matching check digit confirms only mathematical consistency; it does not prove that GS1 or an ISBN agency issued the code or identify a product.
Is my list uploaded?
Everything is processed in this browser. Codes are not uploaded or stored.