Credit Card Validator
Validate credit card numbers using the Luhn algorithm
Card Number Validation
Enter a credit card number to validate its format and checksum
Enter numbers only, spaces and hyphens will be ignored
Test with Sample Cards
Try validation with these test credit card numbers
Supported Card Types
^4[0-9]{12}(?:[0-9]{...^5[1-5][0-9]{14}$...^3[47][0-9]{13}$...^6(?:011|5[0-9]{2})[...^3[0689][0-9]{11}$...^(?:2131|1800|35\d{3...About Credit Card Validation
Luhn Algorithm
The Luhn algorithm (also known as the "modulus 10" algorithm) is a checksum formula used to validate credit card numbers. It can detect single-digit errors and most adjacent transposition errors.
Security Notice
This tool only validates the format and checksum of credit card numbers. It does not verify if a card is active, has sufficient funds, or is authorized for use. Never use this tool with real credit card information.
Test Cards
The test card numbers provided are standard test numbers used by payment processors for development and testing. They will validate correctly but cannot be used for actual transactions.
Frequently Asked Questions
- How does credit card validation work?
- Credit card validation uses the Luhn algorithm (also known as the mod 10 algorithm) to verify that a credit card number is mathematically valid. This algorithm checks the checksum digit to detect simple errors in typing or transmission, but doesn't verify if the card is active or has sufficient funds.
- What credit card types are supported?
- The validator supports major credit card types including Visa, Mastercard, American Express, Discover, Diners Club, and JCB. Each card type has specific number patterns and length requirements that are checked during validation.
- Are the test card numbers safe to use?
- Yes, the test card numbers provided are specifically designed for development and testing purposes. They pass the Luhn algorithm but are not real, active credit cards and cannot be used for actual transactions.
- Is my credit card information secure?
- Absolutely. All validation is performed locally in your browser - no credit card data is transmitted to our servers. The tool is designed for development, testing, and educational purposes only.