Validate credit card, debit card, and payment card numbers instantly. Confirm mathematical structural integrity using the official Luhn Mod-10 checksum algorithm, identify card issuers (Visa, Mastercard, American Express, Discover, JCB) by IIN/BIN prefixes, and verify card number lengths.
The Luhn algorithm (also known as the modulo 10 formula) is a simple checksum formula used to validate a variety of identification numbers, such as credit cards. By doubling every second digit from the right and summing the resulting digits, the final sum must be divisible by 10. This mathematically catches about 98% of common input errors, such as single-digit typos or transposed digits.
Absolutely. Checkistan prioritizes absolute financial data security. Our validator operates entirely on your client device using local React states. No network requests are made, and card numbers are never sent to any server, stored, or logged. However, as a best practice, you should never share your CVV or expiration date.
No. This tool is an offline mathematical syntax validator. It confirms if a number is structured correctly according to ISO/IEC 7812 specifications. To check card status, active accounts, or credit balances, a payment gateway connection (like Stripe or merchant APIs) is required to query card-issuing bank databases.