How to Fix: Invalid GTIN Check Digit (Mod-10)
The GTIN (UPC, EAN, or ISBN) failed the GS1 Mod-10 check digit algorithm.
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Instant test for Invalid GTIN Check Digit (Mod-10)
Issue Root Cause and Repercussions
Typo in barcode number, missing leading zeros from Excel auto-formatting, or incorrect check digit calculation.
Google Merchant Center automatically disapproves products with invalid GTINs because it prevents Google from matching the offer to its product catalog and Shopping graph.
Step-by-Step Resolution Guide
Export your current raw product catalog from your e-commerce store (Shopify Admin > Products > Export or WooCommerce feed plugin).
Verify the physical barcode on the product packaging or GS1 database. Recalculate the last digit using the Mod-10 algorithm or restore truncated leading zeros.
Recalculates and replaces the last digit with the correct GS1 Mod-10 check digit.
Have a full product feed with this error?
Upload your CSV or XML feed to auto-clean all affected SKUs at once.
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