Securely check credit or debit card numbers using the standard Luhn algorithm (Mod 10). 100% private, client-side execution.
Type your credit card number into the input field. Spaces or hyphens are automatically handled.
The tool immediately runs the Luhn algorithm to check the mathematical validity of the number.
Instantly see the card network (Visa, MC, etc.) and whether the number is valid or invalid.
Your sensitive data is never sent to our servers. All calculations are performed instantly within your own computer's memory.
We use the Luhn Algorithm (Mod 10), which is the global standard used by banks to prevent accidental typing errors.
Identifies major card brands like Visa, Mastercard, American Express, Discover, JCB, and more based on their unique prefixes.
The Luhn algorithm, also known as the "modulus 10" algorithm, is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers and IMEI numbers. It was designed to protect against accidental errors, such as typing a digit wrong or switching two digits.
No. A "Valid" result only means that the number itself is mathematically correct according to the Luhn checksum and follows the formatting rules of a credit card. It does not verify the actual account existence, balance, or security code (CVV).
Yes, absolutely. This tool is built entirely using client-side JavaScript. This means your credit card number stays in your browser and is never transmitted over the internet to our servers. You can even use this tool while offline.
Card brand identification is based on the first few digits (BIN). While we support all major networks (Visa, MC, Amex, Discover, JCB, Diners), some smaller or local card networks might not yet be in our prefix database.