Credit Card Validator

Validate credit card numbers using the Luhn algorithm. Support for Visa, Mastercard, American Express, Discover, and more.

About Credit Card Validation

What is Credit Card Validation?

Credit card validation is the process of verifying that a credit card number is mathematically valid using algorithms like Luhn. This validation checks the card number format, identifies the card type (Visa, Mastercard, etc.), and ensures the number follows the correct mathematical pattern.

Our validator uses the industry-standard Luhn algorithm (also known as the "modulus 10" algorithm) to verify card numbers. This algorithm is used by all major payment processors and financial institutions worldwide.

Why Use Our Credit Card Validator?

Luhn Algorithm: Industry-standard validation method
Multiple Card Types: Supports Visa, Mastercard, Amex, Discover, and more
Real-time Validation: Instant results with detailed card information
Test Card Numbers: Built-in sample cards for testing purposes

The Luhn Algorithm Explained

The Luhn algorithm is a simple checksum formula used to validate credit card numbers. Here's how it works:

Step 1: Reverse & Double

Starting from the rightmost digit (excluding the check digit), move left and double every second digit. If doubling results in a two-digit number, subtract 9 from it.

Step 2: Sum & Check

Sum all the digits (both doubled and original). If the total modulo 10 equals zero, the card number is valid according to the Luhn algorithm.

Supported Card Types

Visa

Pattern: Starts with 4

Length: 13, 16, 19 digits

Mastercard

Pattern: Starts with 51-55

Length: 16 digits

American Express

Pattern: Starts with 34, 37

Length: 15 digits

Discover

Pattern: Starts with 6011, 65

Length: 16 digits

Diners Club

Pattern: Starts with 30-36, 38

Length: 14 digits

JCB

Pattern: Starts with 35

Length: 16 digits

Use Cases & Applications

E-commerce Development: Validate card numbers before processing payments
Payment Gateway Testing: Test payment forms with valid card number formats
Financial Applications: Implement client-side validation for better UX
Form Validation: Provide immediate feedback on card number entry
Educational Purposes: Learn how credit card validation algorithms work
Quality Assurance: Test payment systems with mathematically valid numbers

Important Security Note

This tool only validates the mathematical correctness of credit card numbers using the Luhn algorithm. It does not verify if a card is active, has sufficient funds, or is authorized for transactions.

Never use real credit card numbers for testing. Always use the provided test card numbers or generate test numbers specifically designed for development and testing purposes.