Credit Card Validator

Luhn checksum and card network identifier

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Full guide

How Credit Card Number Validation Works (Luhn)

Learn the Luhn checksum, IIN/BIN network prefixes, client-side card checks, and why validation is not payment processing or proof a card is real.

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About Credit Card Validator

Check any credit or debit card number for validity using the Luhn (mod-10) checksum algorithm. This tool also identifies the card network (Visa, Mastercard, Amex, Discover, JCB, UnionPay, Maestro, Diners Club) based on the Issuer Identification Number prefix. No data is sent to any server.

Credit Card Validator Features

  • Luhn (MOD-10) checksum validation
  • 8 card network detection
  • Masked number display
  • 100% private and client-side processing

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