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Credit Card Validator
Verify a credit card number using the Luhn algorithm.
| Credit Card Type | Credit Card Number |
|---|---|
| American Express | 371449635398431 |
| Diners Club | 30569309025904 |
| Discover | 6011111111111117 |
| JCB | 3530111333300000 |
| MasterCard | 5555555555554444 |
| Visa | 4916592289993918 |
Validate a credit card number format
Our validator checks if a card number follows the Luhn algorithm and identifies the issuing network (Visa, Mastercard, Amex, etc.). This is a format check only — it doesn't verify if the card is active or has funds.
How to use it
- Enter the card number to validate
- Get Luhn validation (valid/invalid) and detected network
Use cases
- Development — verify your client-side validation works
- Testing — validate numbers from our test card generator
- Typo detection — Luhn catches most input errors
FAQ
What is the Luhn algorithm?
The Luhn algorithm (also called "modulo 10") is a mathematical formula used to validate credit card numbers and other identifiers. It catches common input errors (swapped digits, missing digits) but doesn't verify the card actually exists.
