Credit Card Validator
Validate credit card numbers using the Luhn algorithm. Detect card type (Visa, MasterCard, American Express, etc.) and check format integrity.
Test Card Numbers
Note: These are test numbers for validation purposes only. Never use real credit card numbers for testing.
About the Luhn Algorithm
The Luhn algorithm (also known as the "modulus 10" algorithm) is a checksum formula used to validate credit card numbers and detect simple errors in typing.
How it works:
- Starting from the rightmost digit, double every second digit
- If doubling results in a number > 9, subtract 9
- Sum all the digits
- If the total is divisible by 10, the number is valid
Share This Tool
Found this tool helpful? Share it with others who might benefit from it!
💡 Help others discover useful tools! Sharing helps us keep these tools free and accessible to everyone.