Credit Card Number Validator - Validate VISA, MasterCard, AMEX, Discover

Credit Card Validator - Validate Credit Card Numbers Online

Our free credit card validator tool allows you to instantly validate credit card numbers and identify card types including VISA, MasterCard, American Express (AMEX), and Discover. Using the industry-standard Luhn algorithm, our validator checks if a credit card number is valid before processing payments or transactions.

What is Credit Card Validation?

Credit card validation is the process of verifying that a credit card number is properly formatted and mathematically valid before processing a transaction. This helps prevent errors and fraud by catching invalid card numbers early in the payment process. Our validator uses the Luhn algorithm (also known as the "modulus 10" algorithm) to check the validity of credit card numbers.

How Credit Card Validation Works

Luhn Algorithm

The Luhn algorithm is a mathematical formula used to validate various identification numbers, including credit card numbers. It works by:

Starting from the rightmost digit, double every second digit
If doubling results in a two-digit number, subtract 9
Sum all the digits
If the total sum is divisible by 10, the card number is valid

Card Type Identification

Different card types can be identified by their prefix digits and length:

VISA: Starts with 4, 13 or 16 digits
MasterCard: Starts with 51-55 or 2221-2720, 16 digits
American Express (AMEX): Starts with 34 or 37, 15 digits
Discover: Starts with 6011, 65, or 644-649, 16 digits
Diners Club: Starts with 36, 38, or 300-305, 14 digits
JCB: Starts with 35, 16 digits

Key Features of Our Credit Card Validator

⚡ Real-time Validation

Validate credit card numbers instantly as you type. No need to click buttons - see validation results immediately with detailed information about the card.

🔍 Card Type Detection

Automatically identify the card type (VISA, MasterCard, AMEX, Discover, etc.) based on the card number prefix and length. Each card type is displayed with its corresponding icon and color.

✅ Luhn Algorithm Check

Our validator uses the industry-standard Luhn algorithm to verify the mathematical validity of credit card numbers. This ensures the card number follows the correct format.

📊 Detailed Validation Results

Get comprehensive validation information including:

Card number (formatted for readability)
Card type identification
Card number length
Luhn algorithm validation status
Card type match verification

🔒 Privacy & Security

All validation happens entirely in your browser. We don't store, log, or transmit your credit card numbers to our servers. Your data remains completely private and secure.

Supported Card Types

💳 VISA

VISA cards start with the digit 4 and can have 13 or 16 digits. They are the most widely accepted credit cards globally and are issued by banks worldwide.

💳 MasterCard

MasterCard numbers start with 51-55 or 2221-2720 and always have 16 digits. MasterCard is one of the largest payment networks in the world.

💳 American Express (AMEX)

American Express cards start with 34 or 37 and have 15 digits. AMEX cards are known for premium benefits and are widely accepted at merchants globally.

💳 Discover

Discover cards start with 6011, 65, or 644-649 and have 16 digits. Discover is a major credit card issuer in the United States with cashback rewards.

💳 Diners Club

Diners Club cards start with 36, 38, or 300-305 and have 14 digits. Originally a charge card, Diners Club now offers credit cards as well.

💳 JCB

JCB (Japan Credit Bureau) cards start with 35 and have 16 digits. JCB is a major credit card brand in Japan and is accepted worldwide.

Common Use Cases

E-commerce Development

Validate credit card numbers in payment forms before submitting to payment processors. This improves user experience by catching errors early.

Payment Processing

Verify credit card numbers before sending them to payment gateways. This helps reduce transaction failures and improves processing efficiency.

Testing & Development

Use our validator to test payment forms and validate test credit card numbers during development and quality assurance.

Data Validation

Validate credit card numbers in databases, spreadsheets, or other data sources to ensure data quality and integrity.

Understanding Validation Results

Valid Card Number

A card number is considered valid when:

The Luhn algorithm check passes (sum is divisible by 10)
The card type matches the expected length for that card type
The card number has the correct length (13-19 digits)
The prefix digits match a recognized card type

Invalid Card Number

A card number may be invalid due to:

Failing the Luhn algorithm check
Incorrect length for the identified card type
Unknown or unrecognized card type prefix
Incorrect number of digits (not between 13 and 19)

Tips for Using Our Credit Card Validator

Enter card numbers with or without spaces/dashes - Our validator automatically removes formatting characters
Use test numbers for development - We provide test credit card numbers for different card types
Check card type identification - The validator shows which card type was detected based on the number
Verify Luhn algorithm - A valid card must pass the Luhn algorithm check
Validate length requirements - Each card type has specific length requirements
Never use real card numbers for testing - Always use test numbers or our provided examples

Test Credit Card Numbers

For testing purposes, you can use these test credit card numbers (these are not real cards and cannot be used for actual transactions):

VISA: 4532 1234 5678 9010
MasterCard: 5555 5555 5555 4444
American Express: 3782 822463 10005
Discover: 6011 1111 1111 1117
Diners Club: 3056 9309 0259 04
JCB: 3530 1113 3330 0000

Privacy & Security

Your credit card numbers are processed entirely in your browser. We don't store, log, or transmit your card numbers to our servers. Your data remains completely private and secure. However, we recommend never entering real credit card numbers into any online tool - always use test numbers for validation purposes.

Browser Compatibility

Our credit card validator works in all modern browsers including Chrome, Firefox, Safari, and Edge. No plugins or additional software required - everything runs in your browser for maximum security.

Frequently Asked Questions

Is the credit card validator free to use?

Yes, our credit card validator is completely free to use. There are no registration requirements, usage limits, or hidden fees. You can validate as many credit card numbers as you need.

What card types does the validator support?

Our validator supports all major card types including VISA, MasterCard, American Express (AMEX), Discover, Diners Club, and JCB. The validator automatically identifies the card type based on the number's prefix and length.

How does the Luhn algorithm work?

The Luhn algorithm is a mathematical formula that validates credit card numbers. It works by doubling every second digit from the right, subtracting 9 from two-digit results, summing all digits, and checking if the total is divisible by 10. If it is, the card number is mathematically valid.

Is my credit card number secure?

Yes, absolutely. All validation happens entirely in your browser - we don't send your card numbers to our servers. However, we strongly recommend never entering real credit card numbers into any online tool. Always use test numbers for validation purposes.

Can I validate cards with spaces or dashes?

Yes, our validator automatically removes spaces, dashes, and other formatting characters before validation. You can enter card numbers with or without formatting, and the validator will process them correctly.

What makes a credit card number invalid?

A credit card number may be invalid if it fails the Luhn algorithm check, has an incorrect length for its card type, starts with an unrecognized prefix, or doesn't match the expected format for the identified card type.

Can I use this for production payment processing?

This tool is designed for development, testing, and validation purposes. For production payment processing, always use proper payment gateway APIs that handle validation, security, and compliance requirements. Our validator is a helpful tool but should not replace proper payment processing systems.

Does validation guarantee the card is real and active?

No. Validation only checks if the card number follows the correct mathematical format. It cannot verify if the card is real, active, has available credit, or belongs to the person using it. Real-time card verification requires integration with payment processors or card issuers.

What are test credit card numbers?

Test credit card numbers are valid numbers that follow the Luhn algorithm but are not associated with real accounts. They're used for testing payment systems during development. These numbers will pass validation but cannot be used for actual transactions.

Does the validator work offline?

Once the page is loaded, the credit card validator works offline. You can validate credit card numbers without an internet connection, making it perfect for working in environments with limited connectivity.