Credit Card Validator - Luhn Check & Card Type Detection

Validate credit card numbers using the Luhn algorithm. Detect card type (Visa, Mastercard, Amex). For testing only - never enter real card numbers online.

Testing Only: Never enter real credit card numbers in online tools. Use test card numbers for development purposes.

Card Number

Card Details

Card Type

Digits

Checksum

Test Card Numbers

Click to use these test numbers:

Invalid test numbers:

Validation Result

Enter a card number to validate

Position	Digit	Double?	Result
Sum	-
Sum mod 10	-

Card Number Prefixes

Card	Prefix	Length
Visa	4	16
Mastercard	51-55, 2221-2720	16
American Express	34, 37	15
Discover	6011, 65	16
JCB	35	16
Diners Club	36, 38	14
Maestro	5018, 5020, 5038, 6304, 6759, 6761-63, 6771	12-19
UnionPay	62	16-19
Elo	5066, 5067, 509, 6363	16
Hipercard	6062, 3841	16
Dankort	5019	16
Mada	5297, 5892, 4370, 4903	16

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Frequently Asked Questions

The Luhn algorithm (mod 10) is a checksum formula used to validate credit card numbers, IMEI numbers, and other identification numbers. It catches accidental errors like typos.

This tool runs entirely in your browser - nothing is sent to any server. However, you should never enter real credit card numbers in online tools. Use test numbers only.

Payment processors provide test numbers like 4111111111111111 (Visa) or 5500000000000004 (Mastercard) for developers to test their integrations without real charges.

No. This validates the number format and checksum only. It doesn't verify if the card exists, is active, or has available balance.

Visa, Mastercard, Amex, Discover, JCB, Diners Club, Maestro, UnionPay, Elo, Hipercard, Dankort, and Mada based on number prefixes and lengths.

It shows each digit, whether it's doubled, the result after doubling and subtracting 9 if needed, and the final sum.

Test cards let developers integrate payment systems and test checkout flows without processing real transactions or handling actual card data.

Validation only checks format. Declines happen for many reasons: insufficient funds, expired, blocked, incorrect CVV/zip, etc.

Yes. Perfect for adding client-side validation to payment forms to catch typos before submitting to payment processors.

Co-branded cards display two network logos (e.g., Cartes Bancaires/Visa, Bancontact/Maestro). They're processed through either network. Our validator detects the international brand, which handles routing automatically.