Purpose
CheckDigit performs informational GS1 Mod-10 generation and validation entirely in your browser.
Important limits
A valid digit only confirms arithmetic consistency. It does not prove issuance, ownership, authenticity, assignment or product identity.
No sensitive workflow
Do not treat this calculator as a barcode scanner, product lookup, identifier issuer or compliance approval.
Responsibility
Verify operational identifiers and labelling decisions against current GS1 documentation and the responsible issuing organisation.
Questions: sympify.info@gmail.com