What this tool checks
Validate GTIN-8, 12, 13 and 14 check digits. All results are calculated locally from your supplied snapshot; no third-party website is automatically scanned.
The 13-digit value 4006381333931 has a valid check digit; changing the last digit makes it invalid.
Scope and limitations
Rule-based local diagnostics are not proof of Google indexing, Merchant Center account status or marketplace approval. Confirm relevant live requirements and verify results before making changes.
Method reference: Official technical guidance (subject to updates).
Frequently asked questions
Does the check contact a seller or Google account?
No. All information is supplied by you; no external account access is used by this release.
Does a passing result guarantee eligibility or rankings?
No. It evaluates the entered snapshot against the stated checks. Live policy eligibility and search performance require independent verification.