GTIN check digit calculator

Client

GTIN check digit calculator captures users who want the computed rightmost symbol without opening a spreadsheet. Paste the number; read expected check digit and GTIN kind.

Using the calculator

Paste or type the GTIN. On pass, the rightmost digit matches GS1 mod-10. On fail, the tool shows the digit that would validate the other positions.

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

  • Double-check manual retyping before submitting vendor master data.
  • Teach GS1 mod-10 with a working calculator link.

Common mistakes to avoid

  • Calculating check digit on partial strings missing leading zeros

    UPC-A and GTIN-14 often need zero padding to reach 12 or 14 digits before mod-10.

FAQ

Can I calculate check digit without the full GTIN?

Paste all digits except you may omit the check digit—the tool computes what the rightmost digit should be.

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.