Credit Card Number Validator
Check card numbers with the Luhn algorithm and detect the brand. Runs only in your browser; nothing is stored or sent.
Runs in your browserText → Text
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Example
4111 1111 1111 1111 5500 0000 0000 0005
✓ 1. Visa •••• 1111 (16 digits, Luhn checksum OK) ✗ 2. Mastercard •••• 0005: Luhn checksum failed (likely a typo) 1 valid, 1 invalid
How to use the Credit Card Number Validator
- Paste or type your Text into the input area, or open a file from your device.
- Adjust the options above the editor if the tool offers any.
- Review the Text result, then copy it or download it as a file.
Privacy and limitations
- Your data is processed on your device and is not uploaded to any server.
Frequently asked questions
Does a valid result mean the card works?
No. The Luhn checksum only catches typing mistakes. Whether a card exists or has funds can only be checked by the card issuer.
Is my card number sent anywhere?
No. Validation runs entirely in your browser, nothing is stored, and the report only shows the last four digits.
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