Credit Card Validator
Check a card number’s validity with the Luhn algorithm and see which brand it belongs to — all locally in your browser.
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Frequently asked questions
What does this checker actually verify?
It runs the Luhn checksum and checks the number’s length and prefix against major card brands. It does NOT confirm the card is real, active or funded — only that the format is valid.
Is it safe to paste my card number?
The check runs entirely in your browser and nothing is stored or sent. Still, use a test or dummy number if you’re unsure.
Which card types are recognized?
Visa, Mastercard, American Express, Discover, Diners Club and JCB by their standard prefixes and lengths.