Google Merchant Center GTIN

Client

Google Merchant Center GTIN errors block Shopping ads and free listings. Paste GTIN/UPC/EAN for local GS1 mod-10 before feed upload—this page does not query Google's product database or fix mismatched brand attributes.

Feed GTIN column QA

Export your feed GTIN column, paste one per line, fix failing rows before re-upload. Invalid check digit is a common disapproval reason that mod-10 catches instantly.

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

  • Pre-validate GTIN column in Merchant Center feed CSV.
  • Debug 'invalid GTIN' warnings before scheduled feed fetch.
  • Agency QA on multi-client product feeds without API keys.

Common mistakes to avoid

  • GTIN pass but brand mismatch still disapproves

    Google matches GTIN to catalog entries—correct checksum does not override wrong brand.

  • Using MPN instead of GTIN for branded goods

    Google requires GTIN when manufacturer assigns one—MPN is fallback only.

FAQ

Does this submit to Merchant Center?

No—local mod-10 only. Upload validated digits in your feed separately.

Which GTIN length for Google Shopping?

8, 12, 13, or 14 digits when assigned—tool detects kind from length.

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.