Credit Card Validator: Luhn Algorithm for eCommerce Fraud Prevention
Verifies if credit card numbers are legitimate using the Luhn algorithm and identifies the card issuer (Visa, Mastercard, etc.). Useful for payment form validation and fraud prevention in e-commerce applications.
Validation Results
Test Card Numbers
Below are example card numbers for testing. These are NOT real credit card numbers:
| Card Type | Test Number | |
|---|---|---|
| Visa | 4916592289993918 |
|
| MasterCard | 5555555555554444 |
|
| American Express | 371449635398431 |
|
| Discover | 6011111111111117 |
|
| Diners Club | 30569309025904 |
|
| JCB | 3530111333300000 |
What is Credit Card Validation?
Credit card validation is a process to verify if a card number is properly formatted and potentially valid. Every credit card contains a unique series of numbers, typically 16 digits, along with additional information such as the issuer name, expiry date, and security code (CVV).
How Does Credit Card Validation Work?
Card Type Detection
Identifies the issuer (Visa, MasterCard, etc.) based on the card number pattern
Length Validation
Verifies the number of digits matches the card type requirements
Luhn Algorithm Check
Applies checksum verification to detect data entry errors
Format Verification
Ensures proper number grouping and formatting
About CVV (Card Verification Value)
The CVV is a 3 to 4-digit security code printed on the back of credit cards (or front for American Express). It helps protect cardholders during online purchases by verifying physical possession of the card.
Security Tips
- Never share your actual credit card number online
- Use this tool only for validation testing
- Keep your credit card information secure
- Regularly monitor your credit card statements