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PREFLIGHT CHECK

Google Merchant Center GTIN length and checksum checker

Normalize spaces/dashes and validate 8, 12, 13 or 14-digit GTINs and their GS1 check digit.

Check CSV

🔒 Analysis runs in your browser; the file itself is not sent to BlueprintLab.

What this tool checks

  • 8 / 12 / 13 / 14 digits
  • Non-digit detection
  • GS1 check digit

What it cannot determine

This unofficial checker covers only rules that can be verified in the browser. Live account settings, remote server state and later service-side validation remain authoritative.

About this tool

Google Merchant Center GTIN length and checksum checker is a free browser-based preflight checker from BlueprintLab Tools. Normalize spaces/dashes and validate 8, 12, 13 or 14-digit GTINs and their GS1 check digit.

No sign-up is required and the CSV content is processed locally in your browser.

How to use

  1. Choose the target CSV file.
  2. Run the check.
  3. Review detected issues and fix the source file if needed.