GTIN validator

Client

GTIN validator searches want the same workflow as GTIN check: normalize digits, enforce allowed lengths, run GS1 mod-10 on the rightmost check digit. This page names that intent for bookmarking and support macros.

What the validator enforces

Exactly 8, 12, 13, or 14 digits after cleanup. Alternating position weights from the rightmost check digit produce the GS1 mod-10 expected symbol. Mismatch flags transposed or OCR errors.

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

  • Validate GTIN columns before marketplace or WMS upload.
  • Explain validator pass/fail to non-supply-chain stakeholders.

Common mistakes to avoid

  • Using validator output as proof of listing eligibility

    Valid checksum ≠ assigned prefix or live catalog row.

FAQ

What does a GTIN validator check?

Length (8, 12, 13, or 14), digits-only body, mod-10 check digit match, and GTIN kind label.

Is this a GS1 Cloud validator?

No—public GS1 mod-10 arithmetic only.

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.