Validate any credit card number using Luhn algorithm. Detects card type (Visa, Mastercard, Amex) instantly. 100% client-side — no data sent.
Type or paste a credit card number into the input field. The validator checks the number using the Luhn algorithm in real time — the border turns green if valid or red if invalid. The results panel shows validity, detected card type, length, and Luhn sum. Click a test card to load a valid sample number instantly.
The Luhn algorithm (modulus 10) is a simple checksum formula used to validate a variety of identification numbers, including credit card numbers, IMEI numbers, and Social Insurance Numbers. It doubles every second digit from the right, sums all digits, and checks if the total is divisible by 10. This tool shows the step-by-step Luhn calculation for transparency.
The tool uses the Luhn algorithm (modulus 10) to validate card numbers: it doubles every second digit from the right, sums all digits, and checks if the total is divisible by 10. Card type detection uses IIN/BIN prefixes and length patterns. All processing happens 100% in your browser with no server communication.
Yes, this tool is completely free to use. No registration, no login, and no subscription required. Just open the page and start using it.
Yes, your data is safe. All processing happens entirely in your browser — your input never leaves your device and is not sent to any server.
The Luhn algorithm (modulus 10) is a simple checksum formula used to validate a variety of identification numbers, including credit card numbers. It works by doubling every second digit from the right, summing all digits, and checking if the total is divisible by 10.
Visa, Mastercard, American Express, Discover, JCB, and UnionPay are detected based on IIN/BIN prefixes and number length patterns.
Yes. The tool includes sample test numbers for each card type. These are standard test numbers used in the payments industry — they pass the Luhn check but are not real, active card numbers.