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GTIN check digit validator

Bulk GTIN CSV validator

Paste a Merchant Center affected-products CSV, Shopify product export, or simple GTIN list. The browser checks UPC, EAN, ISBN, and GTIN-14 length, numeric shape, check digit, and duplicate values before you move into product identifier repair.

Start with GTIN shape before feed rules.

Bulk GTIN validation catches obvious UPC, EAN, ISBN, and GTIN-14 length, check digit, non-numeric, and duplicate value problems before you rewrite Shopify barcode fields or Merchant Center rules.

This is shape validation, not GS1 ownership verification.

A valid check digit only means the value has the right mathematical shape. It does not prove brand ownership, product eligibility, Merchant Center approval, or Shopping performance.

Merchant Center affected-products CSV

Use the bulk validator for shape. Use the identifier checker for repair ownership.

A GTIN can fail because the value is malformed, but the repair source can still be Shopify barcode, WooCommerce catalog field, feed app mapping, supplemental feed, or Merchant Center rule. Keep these two decisions separate.

Need MPN, brand, or identifier_exists?

Move the same rows into the identifier checker when field ownership matters.

Open identifier checkerDo Shopify and GMC rows disagree?

Compare product counts, fetch timing, Google channel state, and feed ownership first.

Open Feed TruthNeed the invalid GTIN fix path?

Use the fix page to decide whether the warning starts in source data or feed rules.

Open GTIN fix
GTIN repair handoff

Use the bulk validator for GTIN math. Use the related pages when product identity, feed source, or Merchant Center diagnostics decide the repair.

Identifier repairGMC GTIN, MPN, Brand, and identifier_exists CSV Checker

Use this when GTIN validation needs to be paired with MPN, brand, identifier_exists, Shopify export, or GMC affected-products evidence.

Open resourceFix pageGoogle Merchant Center invalid GTIN fix

Understand why invalid GTIN warnings happen and whether the fix belongs in Shopify barcode, feed app mapping, or Merchant Center rules.

Open resourceFeed TruthShopify to GMC Feed Truth Report

Compare Shopify product exports, Merchant Center diagnostics, feed item counts, fetch timing, and Google channel ownership.

Open resourceDecision treeMissing identifiers GTIN, MPN, and brand

Use this when the issue is not only GTIN shape but whether each product needs GTIN, MPN + brand, or identifier_exists=false.

Open resource
FAQ

Questions before validating GTIN CSV rows.

What does the bulk GTIN validator check?

It checks whether GTIN, UPC, EAN, ISBN, or GTIN-14 values are numeric, have a supported length, pass the check digit, and are not duplicated in the pasted CSV.

Can this verify GS1 ownership?

No. This is shape validation, not GS1 ownership verification. It cannot prove that a GTIN is officially assigned to your brand or product.

Can I paste a Merchant Center affected-products CSV?

Yes. Paste affected product rows or a Shopify product export. The tool looks for common GTIN, barcode, UPC, EAN, ISBN, and variant barcode columns.

When should I use the GMC product identifier checker instead?

Use the identifier checker when the repair depends on MPN, brand, identifier_exists, Shopify product data, feed app mapping, or Merchant Center affected-products evidence.

Does this guarantee Merchant Center approval?

No. A valid check digit does not guarantee Google Merchant Center approval, product eligibility, GS1 ownership, or Shopping performance.