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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.

ツール要約

このツールは構造化された入力を受け取り、サーバーへアップロードせずにブラウザで決定的な出力を返します。

ツール名
Credit Card Validator
入力の目的
変換・検証・分析するソースコンテンツを入力してください。
出力の目的
コピー・再利用・デバッグに適した正規化された出力を受け取ります。
入力例
4111 1111 1111 1111
出力例
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.

ツールの紹介

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.

ツール概要

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.

ユースケース

  • 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.

入力／出力の例

入力の目的
4111 1111 1111 1111
出力の目的
Valid Visa test number (passes Luhn).
入力の目的
5500 0000 0000 0004
出力の目的
Valid Mastercard test number (passes Luhn).

よくある質問

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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