Secure Credit Card Number Validator

Quickly and securely verify the validity of a credit card number with our intelligent validation tool. Using the industry-standard Luhn algorithm, this checker provides instant feedback on whether a card number is mathematically valid. It automatically detects the card brand (Visa, Mastercard, Amex, etc.) and displays it on a visual card, all in real-time as you type. This tool is for validation purposes only and performs all checks locally in your browser. No data is ever stored or transmitted.

How It Works

Our validator provides instant, interactive feedback in a three-step process.

  1. Enter the Card Number: Begin typing the credit card number into the input field.
  2. Observe Real-Time Feedback: Watch as the visual credit card above formats your number and displays the detected brand logo (e.g., Visa, Mastercard).
  3. Get Instant Validation: Once a valid length is reached, the tool performs a Luhn check and immediately displays a "Valid" or "Invalid" result with a corresponding icon.

Key Features

  • Luhn Algorithm Check: Employs the Luhn algorithm (mod-10 checksum), the standard industry method for validating card numbers.
  • Automatic Brand Detection: Instantly identifies major card types including Visa, Mastercard, American Express, Discover, JCB, and Diners Club as you type.
  • Interactive Visual Card: A dynamic display mimics a real credit card, showing your formatted number and the detected brand's logo for a clear, intuitive experience.
  • Live Formatting: Automatically formats the card number into groups of four digits for improved readability.
  • Immediate Validation Feedback: The visual card and result text change color (green for valid, red for invalid) and display a clear icon and message. An invalid number triggers a subtle shake animation for emphasis.
  • Client-Side Security: All validation is performed entirely within your browser. Your data is 100% private and is never sent to our servers or any third party.

How to Use the Validator

  1. Step 1: Start Typing
    Enter the credit card number in the input box. The tool will automatically ignore spaces and non-numeric characters.
  2. Step 2: Watch the Visuals
    The card display above will update in real-time, showing the brand and formatted number.
  3. Step 3: Check the Result
    When the number reaches a sufficient length (13-19 digits), the result panel will instantly show whether the number is "Valid" or "Invalid" according to the Luhn checksum.
  4. Step 4: Clear to Restart
    Click the clear button to reset the tool and validate another number.

Find Our Tool

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