Credit Card Validator
Paste a credit card number to check whether it is valid — complete with the reason if it is invalid and a component breakdown if it is valid. Everything is processed on your device.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
4111 1111 1111 1111
Example Output
✓ VALID — Visa, Luhn passes
How to Use
- 1Paste the a credit card number you want to check into the input box.
- 2If the tool offers extra options (e.g. dialect, flags, or variant), set them as needed.
- 3Click Validate (or press Ctrl+Enter).
- 4Read the result badge — VALID, INVALID, or VALID with a warning — along with the details and the list of issues, if any.
About Credit Card Validator
Credit Card Validator applies the Luhn algorithm to check whether a card number has the correct check digit (checksum), and detects the card network (Visa, Mastercard, Amex, Discover, JCB, and more) from its prefix pattern. Spaces and hyphens are ignored.
Important: this is format & Luhn validation only — it does NOT verify the card actually exists, is active, or has funds. Use it to catch typos in a form, not for payment authorization.
FAQ
Is my data sent to a server?
No. All validation runs in your browser with JavaScript. Nothing is uploaded, logged, or stored on our servers — safe for sensitive data.
How is this validator different from a parser or formatter?
A validator answers one question: is this input correct/valid? It returns a valid/invalid badge with the reason. A parser breaks input into its components, and a formatter tidies its layout. Use a validator when you just need to confirm something is sound before using it.