Card Validator
Checks whether a card number passes the Luhn checksum.
Lilu Baba's Card Validator checks a card number against the Luhn algorithm, the checksum formula used by credit cards, debit cards and other identification numbers to catch typos.
How to use this tool
- Enter a card number, with or without spaces.
- Its Luhn checksum validity updates instantly.
FAQ
Card Validator — frequently asked questions
No — this only checks that the number is structurally valid per the Luhn algorithm, not whether it belongs to a real, active account.
No — the check runs entirely in your browser. Nothing is sent to our servers.