Credit Card Validator

Free online tool to instantly validate credit card numbers using the industry-standard Luhn algorithm

CARD NUMBER
#### #### #### ####
CARDHOLDER NAME
John Doe
EXPIRES
12/25

Supported Card Types

Visa
Mastercard
Amex
Discover

Validate Your Card

Enter without spaces or dashes

About Credit Card Validation

This free online tool allows you to validate credit card numbers instantly using the industry-standard Luhn algorithm. Simply enter your card number, and our validator will check if it's mathematically valid according to payment industry standards.

What is the Luhn Algorithm?

The Luhn algorithm (also called the "modulus 10" algorithm) is a simple checksum formula used to validate identification numbers like credit cards. Developed in the 1950s, it's now an international standard (ISO/IEC 7812-1) used by all major credit card companies.

Why Validate Credit Card Numbers?

  • Prevent errors - Catch typos before processing payments
  • Improve user experience - Give immediate feedback during form entry
  • Reduce fraud - Identify invalid card numbers early
  • Save processing costs - Avoid unnecessary payment attempts

How Does This Tool Work?

Our validator performs these checks:

  1. Removes spaces and dashes from the input
  2. Verifies the number contains only digits
  3. Checks the number length (13-19 digits)
  4. Identifies the card type based on initial digits
  5. Applies the Luhn algorithm to validate the number

Important Notes

This tool only checks the mathematical validity of card numbers. It does not:

  • Check if the card is active or has available funds
  • Verify cardholder information
  • Process any payments
  • Store or transmit your card information

All processing happens entirely in your browser - no data is sent to any server.

Frequently Asked Questions

What is a credit card validator?

A credit card validator checks if a card number is mathematically valid using the Luhn algorithm. It helps identify potential errors in card numbers before processing payments.

Is this tool safe to use?

Absolutely! All processing happens in your browser. We don't store, transmit, or process your card information on any server. Your card data never leaves your device.

Does this tool work for all card types?

Yes, it works with Visa, Mastercard, American Express, Discover, and most other major card brands that use the Luhn algorithm standard.

Can this tool check if a card is active?

No, this only checks the mathematical validity of the card number. It cannot verify if the card is active, has available funds, or belongs to a specific person.

Why is my valid card showing as invalid?

Double-check that you entered the number correctly without spaces or dashes. If the problem persists, the card might be from a provider that uses a different validation system.