The Luhn algorithm (also known as mod 10 algorithm) was invented by IBM scientist Hans Peter Luhn in 1954. It's a simple checksum formula used to validate various identification numbers. It's widely used for credit cards, debit cards, IMEI numbers, Canadian SIN numbers, and more.
Steps: 1) Starting from the rightmost digit, double every second digit; 2) If doubling results in a two-digit number, add the digits together; 3) Sum all digits; 4) If the total sum is divisible by 10, the number is valid. It's a basic digit verification mechanism.
No. Luhn validation only confirms the number format follows the algorithm rules. It does NOT mean the credit card actually exists, is active, or has available credit. Real credit card verification requires authorization checks through payment gateways. The Luhn algorithm is primarily for catching accidental input errors.
The Luhn algorithm is widely used for: credit card numbers (Visa, Mastercard, American Express, Discover, etc.), debit card numbers, IMEI numbers (phone identifiers), Canadian SIN numbers, some national ID numbers, and ISIN (International Securities Identification Numbers). This tool also identifies common card issuers.
No. All processing is done locally in your browser. Data is never sent to any server. You can use it with complete privacy.