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Credit Card Validator

Validate credit card numbers and identify the brand

Enter a credit card number with or without spaces/dashes

Enter a credit card number above to validate it

Valid test numbers:

Visa: 4111 1111 1111 1111

Mastercard: 5500 0000 0000 0004

Amex: 3782 822463 10005

Discover: 6011 1111 1111 1117

Diners Club: 3056 9309 0259 04

JCB: 3530 1113 3330 0000

How the Luhn algorithm works

The Luhn algorithm (also known as “mod 10”) is a simple checksum formula used to validate credit card numbers, IMEI numbers, and other identification numbers.

  1. Starting from the rightmost digit, double every second digit.
  2. If doubling results in a number greater than 9, subtract 9 from it.
  3. Sum all digits (both doubled and untouched).
  4. If the total sum is divisible by 10, the number is valid.

This check catches common data-entry errors such as single-digit typos and digit transpositions, but it does not verify that the card actually exists or has available funds.

How to Use

1. Enter the card number (with or without spaces) 2. Validation happens automatically 3. See the brand and validation result

Examples

Visa: 4532 1234 5678 9012 Mastercard: 5555 1234 5678 9012 Amex: 3714 501234 56789 Discover: 6011 1234 5678 9012

Credit Card Validator

Online credit card validator that checks if a card number is valid using the Luhn algorithm and automatically identifies the brand (Visa, Mastercard, Amex, Discover, Diners Club, JCB).