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UPCA Checker – Universal Product Code (UPC-A) Validator
UPC-A is a 12‑digit code; the last digit is a mod‑10 check digit (odd/even weighting same as EAN‑13).

Quick Tips

UPC‑A is the standard product barcode used in the US and Canada. It uses 12 digits, with the check digit calculated by the same mod‑10 algorithm as EAN‑13 (odd positions ×3, even ×1).

Valid examples: 012345678905, 042100116286, 789012345678.

UPCA Checker Guide – Validate Your Product Barcodes with Ease

What Is a UPC‑A Barcode?

UPC‑A (Universal Product Code‑A) is a 12‑digit numeric barcode widely used in the United States and Canada, managed by GS1 US. The first 11 digits encode the manufacturer and product identifiers, while the 12th digit is a mod‑10 check digit. The check algorithm is identical to EAN‑13: sum the digits from right to left, multiplying odd‑position digits by 3 and even‑position digits by 1, then take the complement of the total modulo 10.

How to Use This UPCA Checker Tool

  1. Enter the 12‑digit code (non‑digit characters are automatically stripped).
  2. Click “Validate” – the tool verifies the length and the mod‑10 check digit.
  3. Review the validation result instantly.

This free tool is ideal for retailers, brand owners, and barcode printing companies.

Frequently Asked Questions

1. How do I convert a UPC‑A to EAN‑13?

Simply prefix a zero to the UPC‑A code (e.g., 012345678905 becomes 0012345678905 as EAN‑13). The check digit is then recalculated accordingly.

2. Why might validation fail?

Common reasons: incorrect length (not exactly 12 digits), presence of non‑numeric characters, or an invalid check digit.

Questions? Feel free to reach out.