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Productivity tools
Credit Card Checker

Productivity / Everyday

Credit Card Checker

Check a card number’s length and Luhn checksum locally.

On-device processing

Card number

Enter a number to check its format.

How it works

Checks 12–19 digits using the Luhn algorithm. Passing this check does not establish that a card was issued, is active or has funds. This tool does not contact a bank, store the number or ask for a CVV.

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