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Credit Card Validator

Validate credit card numbers using the Luhn algorithm. Enter a card number to check if it's a valid format without storing any data.

Enter Credit Card Number

Try These Sample Numbers

Visa
4532 0151 1283 0366
Mastercard
5555 5555 5555 4444
American Express
3782 8224 6310 005
Discover
6011 1111 1111 1117
Invalid Example
1234 5678 9012 3456

How the Luhn Algorithm Works

  1. Starting from the rightmost digit, double every second digit
  2. If doubling results in a two-digit number, add the digits together
  3. Sum all the digits in the modified number
  4. If the total sum is divisible by 10, the number is valid

🔒 Privacy First

This tool validates card numbers locally in your browser. No data is stored or transmitted anywhere.