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Credit Card Validator

Check whether a credit card number passes the Luhn checksum, detect the card brand (Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay, Maestro), and see the expected check digit for any partial number.

도구 요약

이 도구는 구조화된 입력을 받아 서버 업로드 없이 브라우저에서 결정적인 출력을 반환합니다.

도구 이름
Credit Card Validator
입력 의도
변환·검증·분석할 원본 콘텐츠를 제공하세요.
출력 의도
복사, 재사용 또는 디버깅에 적합한 정규화된 출력을 받습니다.
예시 입력
4111 1111 1111 1111
예시 출력
Valid Visa test number (passes Luhn).
Valid Visa card number (passes Luhn check).
Digits16
BrandVisa
Formatted4111 1111 1111 1111
Expected check digit0
This tool runs entirely in your browser. Numbers are never sent anywhere.

About the Luhn algorithm

The Luhn algorithm (ISO/IEC 7812-1) is a checksum used by credit cards, IMEI numbers, and some national IDs. Passing the check means the number is internally consistent — it does not mean the card has been issued, is active, or has funds available.

도구 소개

Check whether a credit card number passes the Luhn checksum, detect the card brand (Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay, Maestro), and see the expected check digit for any partial number.

도구 개요

The Luhn algorithm is the same checksum used by banks, IMEI numbers, and some national IDs. Passing the check means the digits are internally consistent — it does not mean the card has been issued, is active, or has funds. This tool runs entirely in your browser so numbers never leave your device. Use it for test data, QA, and to build intuition about how card numbers are structured.

사용 사례

  • Use Credit Card Validator when you need fast validate credit card numbers with the luhn algorithm, detect the card brand, and compute the expected check digit — 100% client-side.
  • Handle security workflows directly in the browser with no install required.
  • Support SEO long-tail intent by covering quick checks, troubleshooting, and one-off conversions.

입력/출력 예시

입력 의도
4111 1111 1111 1111
출력 의도
Valid Visa test number (passes Luhn).
입력 의도
5500 0000 0000 0004
출력 의도
Valid Mastercard test number (passes Luhn).

자주 묻는 질문

Does this check whether the card is real?+
No. It only verifies the structural checksum. Real validation requires a payment gateway.
What brand lookup is used?+
A static table of Issuer Identification Number (IIN) prefixes and valid lengths for Visa, Mastercard, Amex, Discover, JCB, Diners, UnionPay, and Maestro.
Is my card number sent anywhere?+
No. Everything runs entirely client-side. Still, avoid pasting real cards on any site.

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