UPC-A check

Client

UPC-A barcodes encode GTIN-12—twelve digits including the mod-10 check digit. Paste from packaging or POS export for local validation—no retailer product database.

UPC-A vs GTIN-13

Many US items show UPC-A (12 digits) while global listings use GTIN-13 with a leading zero. Validate the digit string you have—Toolcore accepts 12 or 13 digits.

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

  • Verify US retail barcode copy before marketplace listing.
  • Compare scanned UPC against vendor spreadsheet column.

Common mistakes to avoid

  • Dropping leading zero from 12-digit UPC-A

    Leading zeros are significant—pad to twelve digits before mod-10.

FAQ

Is UPC-A the same as GTIN-12?

Yes—UPC-A is the 12-digit symbology form of GTIN-12 with GS1 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.