Credit card Luhn check

Client

Credit card Luhn check names the algorithm explicitly—Luhn mod-10 on payment primary account numbers, not ISO 3779 mod-11 used on VINs. Paste digits to run the doubling-and-sum rule locally.

Luhn mod-10 steps

From the right, double every second digit; subtract 9 when product exceeds 9; sum all digits; valid when total mod 10 equals zero. Toolcore runs this in your browser on pasted PAN digits.

Sensitive data: checks run only in your browser. Prefer processor-published test card numbers, never live PANs on shared devices.
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Spaces and dashes are stripped before counting digits and running Luhn. Card-network labels come from common public BIN/IIN ranges—they may mismatch exotic co-branded or new ranges.

16 digits after cleanup

Likely network: Visa

Luhn checksum: passes — algorithm-only; does not mean the card is active or genuine.

Common use cases

  • Cross-check engineering samples against Luhn spec documents.
  • Explain Luhn vs other checksums when auditing mixed identifier CSVs.

Common mistakes to avoid

  • Applying VIN mod-11 weights to card numbers

    Payment cards use Luhn mod-10 from the rightmost digit—not VIN position weights.

FAQ

Do credit cards use Luhn?

Yes—primary account numbers typically include a Luhn mod-10 check digit.

Is there a generic Luhn tool?

Yes—use /tools/luhn for non-card identifiers that also use mod-10.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • credit card luhn check online
  • visa mastercard bin checker browser
  • payment card checksum validator no upload
  • validate primary account number luhn locally
  • discover amex prefix checker heuristic online

More tools

Related utilities you can open in another tab—mostly client-side.