SecurityRuns locally · No upload

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.

Private by design

Everything runs in your browser. Your input is never uploaded, stored, or logged on our servers.

Works offline after load

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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 Utiliio 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.