Credit Card Tools
Credit Card Tools
Validate any credit card number using the Luhn algorithm and network prefix rules; generate test card numbers for Visa, Mastercard, Amex, Discover, and Diners Club.
No card number yet
Enter a card number on the left to check its Luhn digit, network and length.
Validation uses the Luhn algorithm and known card network prefix/length rules. These are test numbers for development only — never use real card numbers.
Credit Card Tools
Validate any credit card number using the Luhn algorithm and network prefix rules; generate test card numbers for Visa, Mastercard, Amex, Discover, and Diners Club.
Common uses
- Validate a card number with Luhn check
- Generate test Visa numbers for development
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Frequently asked questions
How do I check a credit card number with the Luhn algorithm?
Enter the number in the Validator tab to see whether it passes the Luhn check and which network prefix it matches.
How do I generate test credit card numbers?
The Generator tab creates Luhn-valid numbers for Visa, Mastercard, Amex, Discover and Diners Club.
Do the generated cards work for real payments?
No. They are syntactically valid test numbers only, not real accounts. Use your payment provider's documented sandbox cards for gateway tests.
Does a Luhn-valid number mean the card exists?
No, Luhn only catches typos. It does not confirm an account exists.
Is my data uploaded to a server?
No. This tool runs entirely in your browser — your input is processed locally on your device and is never uploaded or stored on a server.