Free local product-data tool
Paste Shopify variant barcodes to find unsupported lengths, check-digit errors, restricted prefixes, and duplicate values before they reach a product feed. No signup and no upload.
The check covers supported GTIN lengths, check digits, Google-restricted and coupon prefixes, and repeated values in the pasted batch.
What this result means
A correct check digit only shows that a number is structurally consistent. This tool cannot confirm who owns a barcode, whether it was assigned to a specific item, or whether Google will approve a product.
FeedSnapshot AI scans Shopify product and variant data read-only, finds repeated identifier and feed-readiness issues, and exports prioritized fixes without editing the store.
Install the free Shopify appNo. This tool validates structure, check digits, Google prefix restrictions, and duplicate use in the pasted batch. Confirm assignment against product packaging, manufacturer records, or GS1.
It checks GTIN-8, GTIN-12, GTIN-13, and GTIN-14 values. Spaces and standard dashes are ignored during normalization.
Only when that SKU is also the legitimate GTIN assigned to the product, which is uncommon. A merchant-created SKU is not automatically a GTIN.
Do not invent one. Confirm that no manufacturer-assigned identifier exists, then follow the current destination rules for products without a GTIN.