Security
Credit Card Validator
Check if a credit or debit card number is structurally valid using the Luhn checksum. Detects Visa, Mastercard, Amex, and Discover card types.
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Frequently asked questions
Does this verify if a card is active?+
No. This only checks the number format using the Luhn algorithm. It cannot verify balance, expiry, or whether the card is active.
Is this tool free?+
Yes. Every Utilio utility is free with no sign-up, usage limits, or paywalls.
Do you store my data?+
No. Processing happens entirely in your browser. Your input never leaves your device.
Can I use this tool offline?+
Yes. Once the page loads, most tools continue working without an internet connection.