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How to fix “Missing or invalid GTIN” in Google Shopping

GTIN errors are the single most common Merchant Center disapproval — and the most dangerous to "fix" the wrong way. Here's what the error means and how to resolve it safely.

What a GTIN actually is

A GTIN (Global Trade Item Number) is the number behind a product's barcode — UPC (12 digits), EAN (13), or ITF-14. Google uses it to match your product to the same product across the web. If your item has a manufacturer barcode, Google expects the GTIN in your feed.

Why yours is "invalid"

Every GTIN ends in a check digit — a value computed from the other digits. If even one digit is mistyped, the check fails and Google rejects the GTIN as invalid. So "invalid GTIN" almost always means a typo, a truncated number, or a made-up value — not a Google bug.

The safe fix (and the dangerous mistake)

Do this instead:

1. Has a real barcode? Copy the GTIN exactly, all digits, no spaces or dashes. Verify the check digit is correct.
2. No barcode (handmade, custom, own-brand)? Set identifier_exists = no in your feed and include a brand where possible. This tells Google the product legitimately has no GTIN — the approved way to handle it.
3. Unsure? Remove the bad value and set identifier_exists = no rather than leaving a wrong number in place.

Fixing them in bulk

If you have hundreds of products, fixing GTINs by hand is painful. Feed Doctor's Fixer applies the safe rule automatically: it removes invalid GTINs and sets identifier_exists = no on the affected rows, and never fabricates a value — then hands you a corrected feed to re-upload.

Related: All disapproval reasons · 10 common Shopify feed errors
Not affiliated with Google. Validates against Google's public product-data spec.