Luhn Check Digit Calculator

Validate & generate Luhn check digits

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About Luhn Check Digit Calculator

A dual-mode Luhn algorithm tool that both validates existing numbers and generates the correct check digit for partial numbers. Enter a full credit card number, IMEI, or other Luhn-protected identifier to verify its validity, or enter a number missing its last digit to calculate what the check digit should be. Shows step-by-step calculation breakdown, digit-by-digit doubling, and sum visualization. Supports all Luhn-based systems including Visa, Mastercard, Amex, IMEI, Canadian SIN, and National Provider Identifiers.

Luhn Check Digit Calculator Features

  • Validate any Luhn number
  • Generate missing check digits
  • Step-by-step breakdown
  • Credit card type detection
  • IMEI support

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