Credit Card Validator

Validate credit card numbers with Luhn algorithm

Check if credit card numbers are mathematically valid. This tool does NOT store or transmit your data.

⚠️ Privacy Notice: This tool validates card numbers locally in your browser using the Luhn algorithm. No data is sent to any server. Do NOT use real credit card numbers for testing.

Enter Card Number

Enter 13-19 digit card number (spaces optional)

Test with Sample Cards

Use these valid test card numbers to see how the validator works:

About the Luhn Algorithm

The Luhn algorithm (also called modulus 10 or mod 10 algorithm) is a checksum formula used to validate credit card numbers. It was created by IBM scientist Hans Peter Luhn.

How It Works

  1. Start from the rightmost digit
  2. Double every second digit
  3. If result > 9, subtract 9
  4. Sum all the digits
  5. If sum % 10 = 0, it's valid

Supported Card Types

  • Visa (13 or 16 digits)
  • Mastercard (16 digits)
  • American Express (15 digits)
  • Discover (16 digits)
  • Diners Club (14 digits)
  • JCB (15-16 digits)

Important: This validation only checks if the number is mathematically valid. It does NOT verify if the card actually exists, has funds, or is active.

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