Credit Card Validator
Your data never leaves your browserValidate a credit card number using the Luhn algorithm and detect the card type.
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About Credit Card Validator
Enter a credit card number to check whether it passes the Luhn algorithm checksum. The tool also auto-detects the card network (Visa, Mastercard, Amex, Discover, Diners, JCB) based on the number prefix. Useful for testing payment form validation and verifying generated test data.
How to use
- Paste or type a credit card number into the input field (spaces and dashes are ignored).
- The validator instantly shows whether the number is valid and what card type it matches.
More Credit Card / Finance
Frequently Asked Questions
FAQs about Credit Card Validator
What does the Luhn algorithm check?
The Luhn algorithm verifies that the credit card number has a valid checksum. It does not verify whether the card exists or has sufficient funds — only that the number is structurally valid.
What card types are detected?
The tool detects Visa (starts with 4), Mastercard (starts with 51–55 or 2221–2720), Amex (starts with 34 or 37), Discover (starts with 6011 or 65), Diners Club (starts with 300–305 or 36), and JCB (starts with 3528–3589).
Can I include spaces or dashes?
Yes. Spaces, dashes, and other non-digit characters are stripped before validation, so you can paste formatted card numbers directly.
Is 4111 1111 1111 1111 a valid test number?
Yes. 4111111111111111 is a well-known Visa test card number that passes the Luhn check and is widely used in payment testing.
Is my data safe?
All validation runs in your browser. No card numbers are ever sent to any server.