Credit Card Validator

Validate credit card numbers using the Luhn algorithm

Validate credit card numbers using the Luhn algorithm and card type detection

Credit Card Number

Test Examples

Luhn Algorithm

The Luhn algorithm is a checksum formula used to validate credit card numbers and detect simple errors.

How it works:

Starting from the right, double every second digit
If doubling results in a two-digit number, subtract 9
Sum all digits
If the total is divisible by 10, the number is valid

Supported Card Types

Visa:4xxx xxxx xxxx xxxx

Mastercard:5xxx xxxx xxxx xxxx

American Express:3xxx xxxxxx xxxxx

Discover:6xxx xxxx xxxx xxxx

JCB:35xx xxxx xxxx xxxx

Diners Club:3xxx xxxx xxxx xx

Important Notice

🔒 Privacy & Security

This tool only validates the mathematical correctness of credit card numbers using the Luhn algorithm. It does not store, transmit, or process any data. Never enter real credit card information on untrusted websites. This tool is for educational and testing purposes only.