GS1 check digit

Client

GS1 check digit is the standard term for the rightmost validating symbol on Global Trade Item Numbers. Paste digits to confirm the mod-10 relationship—no prefix assignment lookup.

GS1 check digit scope

Toolcore validates mod-10 on GTIN lengths only. Company prefix meaning and item reference decode require GS1 documentation—not computed here.

Privacy: every comparison runs locally in your tab. Toolcore performs no GS1 registry lookup, product database match, or price scan—checksum math only.
?

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

  • Explain check digit failures to packaging vendors.
  • Link compliance docs to a working GS1 arithmetic page.

Common mistakes to avoid

  • Confusing GS1 check digit with SSCC extension digit

    SSCC is 18 digits with its own logistics structure—do not paste SSCC into GTIN length guards.

FAQ

What is a GS1 check digit?

The rightmost digit making the alternating 3/1 weighted sum congruent to zero mod 10.

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.