DevToolKit

Credit Card Validator

Validate credit card numbers instantly using the Luhn algorithm. Identify card brand, issuer industry (MII), and BIN details with 100% privacy.

Network
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Card HolderVALID CARD NUMBER
Expires12 / 29

100% Client-side. We never store or transmit your card data.

Luhn Checksum (MOD 10)
Fail
Length Verification
Fail
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How to Use

Verifying a credit card number format is fast and private. The tool provides real-time feedback as you type.

How to use

  1. Enter Card Number: Type or paste the full credit card number into the input field. Spaces and hyphens are automatically handled.
  2. Observe Visual Feedback: The virtual card preview will automatically update its branding (e.g., Visa, Mastercard) based on the input.
  3. Check Indicators: Verify the Luhn Checksum and Length Verification status pills. Both should turn green for a valid number.
  4. Review Details: Scroll down to see detailed information about the card issuer, industry sector, and security code (CVV) requirements.

About This Tool

The Luhn Algorithm

Developed by IBM scientist Hans Peter Luhn in 1954, this algorithm is used worldwide to verify the authenticity of identification numbers. It works by performing a specific mathematical summation of the digits to ensure they satisfy a checksum condition.

While the Luhn check ensures the number is *well-formed*, it does not verify that the card is active or has sufficient funds. It is a structural check only.

Why Use This Tool

Secure Validation

Most online validators send your data to a server for processing. Our tool uses 100% client-side logic, meaning your card number never leaves your computer. This makes it the most secure way to test card formats for e-commerce development or financial research.

FAQ

What is the Luhn Algorithm?
The Luhn algorithm, also known as the 'modulus 10' algorithm, is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers and IMEI numbers. It is designed to protect against accidental errors, such as typing a wrong digit.
How do you identify the card brand?
Card brands are identified by the Issuer Identification Number (IIN), formerly known as the Bank Identification Number (BIN). This is the leading sequence of digits (usually the first 6 to 8 digits) which are assigned to specific networks like Visa (starts with 4) or Mastercard (starts with 2 or 5).
What is an MII code?
The Major Industry Identifier (MII) is the first digit of a credit card number. It categorizes the issuer's primary business, such as 1 or 2 for Airlines, 3 for Travel and Entertainment, and 4 or 5 for Banking and Financial services.
Is it safe to enter my card number here?
Yes. This tool runs entirely in your web browser using JavaScript. No data is ever sent to our servers or transmitted over the network. We recommend using it for testing or validation of card number formats only.
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