Credit Card Validator
Validate credit card numbers using the Luhn algorithm and detect card type.
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FAQ
- What is the Luhn algorithm?
- The Luhn algorithm (mod 10) is a simple checksum formula used to validate identification numbers like credit card numbers. It works by doubling every second digit from the right, subtracting 9 if the result is greater than 9, summing all digits, and checking if the total is divisible by 10.
- Does this tool validate real card details?
- No. This tool only checks if a card number passes the Luhn checksum and matches a known card network prefix. It does not verify whether the card actually exists, has funds, or is active. No data is sent to any server.
- How is the card type detected?
- Card type is detected by the BIN (Bank Identification Number) prefix — the first 4 to 6 digits. For example, Visa cards start with 4, Mastercard with 51–55 or 2221–2720, and American Express with 34 or 37.
Validate any credit card number using the Luhn (mod 10) algorithm and automatically detect the card network by BIN prefix. Supports Visa, Mastercard, American Express, Discover, Diners Club, and JCB. Useful for testing payment integrations and verifying card number formats without making real transactions.