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Credit Card Validator

Check credit card numbers for validity using the Luhn algorithm.

How It Works

1. Enter Number

Type or paste the credit card number into the field. The validation happens in real-time as you type.

2. Instant Validation

The tool instantly checks the number against the Luhn algorithm and identifies the card provider (e.g., Visa, Mastercard).

3. See the Result

The result, showing whether the number is valid and its type, is displayed immediately below the input field.

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Frequently Asked Questions

How does this validator work?

This tool checks if a credit card number conforms to the Luhn algorithm, a checksum formula used to validate a variety of identification numbers. It also checks the card's prefix (the IIN/BIN) to identify the card brand like Visa or Mastercard. It confirms the number is formatted correctly, but it does not check if the card is active, has been issued, or has funds.

Is it safe to enter my credit card number here?

Yes, it is completely safe. All validation logic runs directly in your browser (client-side) using JavaScript. The credit card number you enter is NEVER transmitted, stored, or sent to our servers. It remains securely on your computer and is only used for the real-time check.