Secure and Instant Credit Card Number Validation

Our Credit Card Number Validator provides a quick and secure way to check if a credit card number is valid in its structure. It's an essential tool for developers testing payment forms, businesses verifying customer data entry, or anyone needing to confirm the format of a card number without processing a transaction. Note: This tool does not check if the card has funds or is active; it only verifies the number's structure using the Luhn algorithm.

How It Works: The Luhn Algorithm

The core of our validator is the Luhn algorithm (also known as the Modulus 10 or Mod 10 algorithm), a simple checksum formula used to validate a variety of identification numbers. It works as follows:

  1. Starting from the rightmost digit (the check digit), double the value of every second digit.
  2. If doubling a digit results in a two-digit number, add the two digits together to get a single-digit number (e.g., 14 becomes 1 + 4 = 5).
  3. Sum all the digits (including the undoubled ones).
  4. If the total sum is a multiple of 10, the number is valid according to the Luhn algorithm.

This process helps protect against accidental errors and typos during data entry.

Key Features of Our Validator

  • Luhn Algorithm Check: Performs a robust validation using the industry-standard Luhn algorithm.
  • Automatic Card Brand Detection: Instantly identifies major card brands like Visa, Mastercard, American Express, Discover, and more based on the number's prefix.
  • Real-Time Feedback: The tool provides instant visual feedback, showing a valid or invalid status as you type.
  • Secure & Client-Side: All validation happens directly in your browser. Your credit card number is never sent to our servers, ensuring complete privacy and security.
  • Interactive Card Display: A visual representation of the credit card updates in real-time with the number you enter and the detected brand logo.

How to Use the Credit Card Validator

  1. Step 1: Enter the Credit Card Number
    Type or paste the credit card number into the input field. The tool will automatically format the number for readability.
  2. Step 2: View Instant Results
    As you type, the tool will immediately begin the validation process.
  3. Step 3: Analyze the Feedback
    The result section will display "Valid" or "Invalid" along with the detected card brand. The visual card display will also change color to reflect the status (green for valid, red for invalid).

Find Our Tool with These Keywords

Credit Card Validator, Luhn Algorithm Check, Validate Card Number, BIN Checker, Credit Card Test Tool, Mod 10 Validator, Check Credit Card Validity, Visa Validator, Mastercard Validator, Amex Validator.