GTIN checksum

Client

GTIN checksum searches mean GS1 mod-10 on the full trade item number—not CRC or Luhn. Paste digits to confirm the weighted sum relationship.

Checksum vs catalog

Passing checksum means the digit string is internally consistent. Product identity still depends on correct prefix assignment with your trading partners.

Privacy: every comparison runs locally in your tab. Toolcore performs no GS1 registry lookup, product database match, or price scan—checksum math only.
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GTIN‑8, UPC‑A (GTIN‑12), EAN‑13, and logistic GTIN‑14 all end with the same ISO/IEC GS1 modulus‑10 weight‑3 algorithm used by the barcode generator when it pads shortened bodies with a check digit. Alternate lengths map to retailer packaging standards (coupon GTIN‑12, carton GTIN‑14, compact GTIN‑8).

Result

Passes modulus‑10 GS1 rule for GTIN-13 (13 digits).

Common use cases

  • Map informal spreadsheet column headers to a working validator.
  • Explain checksum failures after barcode scanner misconfiguration.

Common mistakes to avoid

  • Expecting checksum to fix wrong company prefix

    Mod-10 only validates digit arithmetic—not GS1 prefix ownership.

FAQ

What checksum do GTINs use?

GS1 mod-10 with alternating 3 and 1 weights from the right— not MD5 or CRC.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • gtin checksum verifier online
  • ean 13 check digit validate browser
  • upc-a modulus 10 checker locally
  • gtin 14 logistic barcode checksum
  • gs1 digit string validator no lookup

More tools

Related utilities you can open in another tab—mostly client-side.