Credit Card Validator

A credit card validator checks whether a number matches issuer format rules and the Luhn checksum — before you send data to a payment gateway.

VSPIC runs luhn checker and brand detection locally in your browser. It does not verify balances, accounts, or whether a card is active.

The Luhn algorithm doubles every second digit from the right, sums digits, and requires total mod 10 = 0. It catches single-digit typos, not fraud.

All major brands use Luhn for primary account numbers.

Digits include MII (major industry), IIN/BIN (issuer identifier), account digits, and a checksum digit. Our tool shows MII label and first six IIN digits.

• Luhn algorithm pass or fail.
• Card brand from IIN patterns (Visa, Mastercard, Amex, Discover, JCB, RuPay, UnionPay).
• Length vs expected brand lengths.
• MII industry digit label.
• Optional expiry MM/YY format.
• Optional CVV length for brand.

• Account balance or credit limit.
• Whether the card is active or cancelled.
• 3-D Secure enrollment or issuer approval.
• Stolen card databases or chargeback status.
• PCI vault storage — never paste real PANs into untrusted sites.

• Checkout form QA before integrating Stripe or Adyen.
• Teaching Luhn in computer science labs.
• Support scripts explaining “invalid card number” typos.

Card validation tool logic stays client-side. Production checkout must still tokenize PANs with your payment processor and follow PCI DSS.

Never log full card numbers in application servers.

• Luhn algorithm — Wikipedia
• PCI SSC