Security, Hash & Crypto

Credit Card Validator

The Credit Card Validator verifies a card number's format using the Luhn checksum and identifies the issuing brand from its prefix and length. It is built for testing and validation only — it checks the number's mathematical validity, never contacting a bank or storing data.

How card validation works

Every payment card number includes a check digit calculated with the Luhn algorithm (mod-10). By running the same calculation, this tool confirms whether a number is internally consistent — catching typos and obviously fake numbers. The card's leading digits and overall length also reveal which network issued it.

A number that passes these checks is correctly formatted, but that does not mean it is a real, active or funded account — only the issuing bank can confirm that.

Supported card brands

  • Visa, Mastercard and American Express
  • Discover, Diners Club and JCB
  • UnionPay

Safe for testing

All validation runs in your browser. Numbers are never transmitted, logged or stored — making this ideal for testing checkout forms with sample card numbers. Never enter real card details into tools you do not trust.

Related searches

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