홈
Tom Utilities

Luhn 검사 검증기

개발자 유틸리티

Luhn 알고리즘으로 카드 번호를 검증하고 Visa, Mastercard, Amex 등 카드사를 판별합니다.

사용 방법

How the Luhn check works

Starting from the right, every second digit is doubled and its digits summed. If the total is divisible by ten the number passes. The tool also guesses the network from the leading digits.

  1. Type or paste the card number.
  2. The result and card type update as you type.
  3. Copy the normalised number if needed.

자주 묻는 질문

Does a passing number mean the card is real?

No. The Luhn check only catches typing mistakes and random numbers. It says nothing about whether the card exists or is active.

Is my card number safe?

Yes, the check happens in your browser and the number is never transmitted.