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💳 Credit Card Validator

Validate credit card numbers instantly using the Luhn checksum. Detect card issuer (Visa, MasterCard, AMEX, Discover) and format in groups of 4 for readability.

Credit Card Validator

Validate card numbers with the Luhn algorithm. Detect the issuer and check number length.

Format in groups of 4

Samples:

Invalid number

Issuer

—

Length

Checksum

Fail

Reason

Enter a card number.

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