Credit Card Validator
Validate credit card numbers using the Luhn algorithm — the same mathematical check used by all major card networks (Visa, Mastercard, Amex, Discover). This tool detects the card type, validates the check digit, and shows whether the number has a valid format. For educational and testing purposes only. Does not validate actual card ownership, expiration, or CVV. No data is stored or transmitted.
Credit Card Validator
Validates card number format using the Luhn algorithm. For testing purposes only.
Educational tool only. This validates the mathematical format, not real card ownership or funds.
How to Use Credit Card Validator
- 1Enter a credit card number (spaces and dashes are automatically removed)
- 2View the card type detection (Visa, Mastercard, Amex, etc.)
- 3See Luhn algorithm validation result
- 4Use for testing payment form validation logic
Your Privacy is Protected
Credit Card Validator runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
What is the Luhn algorithm?
The Luhn algorithm is a simple checksum formula used to validate credit card numbers. It detects single-digit errors and transposition errors in card numbers.
Does this validate real cards?
No. This tool only validates the mathematical format of a number. It cannot verify whether a card is real, active, or has funds.
Is this legal to use?
Yes. The Luhn algorithm is public knowledge and widely used in payment form validation. This tool is for educational purposes and testing payment processing code.