Credit Card Generator

What Is the Qodex Credit Card Generator?

The Credit Card Generator by Qodex allows developers and testers to generate valid-format but fake credit card numbers for various issuers including Visa, Mastercard, American Express, JCB, Discover, Diners Club, and Maestro. Each number is Luhn-algorithm compliant, meaning it passes structural validation, but none of the generated cards are linked to actual accounts or can process real transactions.

Ideal for developers and testers, it ensures complete safety while mimicking real-world card formats. Whether you're validating form logic, simulating transactions in a sandbox, or testing API payment flows, this tool helps you work efficiently and ethically.

Combine it with: Token Generator, ZIP Code Generator, or Username Generator to simulate full checkout flows.

Test Credit Card Numbers for Payment Gateway Testing

When testing payment integrations, most payment processors provide official test card numbers that work in their sandbox environments. These numbers are designed to simulate successful charges, declines, and specific error scenarios. Below is a reference table of commonly used test card numbers.

Stripe Test Card Numbers

PayPal Sandbox Test Card Numbers

Braintree Sandbox Test Card Numbers

Square Sandbox Test Card Numbers

Adyen Test Card Numbers

Always use these official test numbers in sandbox/test mode. Never attempt to use generated or test card numbers for real transactions.

How the Luhn Algorithm Works

Every credit card number generated by this tool is validated using Luhn's algorithm, the same checksum formula used by real payment networks to verify card number authenticity. Here is how it works:

1. Major Industry Identifier (MII): The first digit signals the card network: "4" for Visa, "5" for Mastercard, "3" for Amex, and so on.

2. Issuer Identification Number (IIN): The first six digits (including the MII) identify the bank or financial institution. The generator crafts IINs that accurately reflect real-world issuers.

3. Luhn checksum: Starting from the rightmost digit, every second digit is doubled. If the result exceeds 9, subtract 9. The sum of all digits must be divisible by 10. This check guarantees structural validity.

Each generated card also includes realistic metadata: expiry date, CVV, and cardholder name. This makes the output suitable for form testing, API mocks, and validating input fields under realistic conditions.

Example Output

{
  "Name": "Ava Smith",
  "Credit_Card_Number": "5842287885520399",
  "Issuer": "Mastercard",
  "Expiry_Date": "04/27",
  "CVV": "944"
}

Why Generated Cards Are Safe

Generated cards are:

• Not tied to real bank accounts

• Cannot process real transactions

• Fully safe for frontend and backend test simulations

Using these cards prevents exposure to sensitive financial data while enabling effective testing in payment forms, eCommerce environments, or KYC onboarding sandboxes.

Key Features

• Multi-Issuer Support: Choose from Visa, Mastercard, Amex, Discover, JCB, Diners Club, and Maestro.

• Luhn-Valid Format: Each number follows real card formatting, suitable for sandbox and frontend validation.

• Bulk Generation: Instantly generate up to 10 cards at once in either card view or JSON format.

• Test-Friendly Metadata: Each card includes CVV, expiry, and cardholder name for full test coverage.

• Quick Copy and Export: Easily copy card details to clipboard or export in JSON for integration.

• No Login Required: Generate unlimited cards with no signup, limits, or throttles.

• Cross-Platform: Works on Chrome, Safari, Firefox, and Edge across desktop, tablet, and mobile.

Common Use Cases

• Testing checkout and payment forms in development

• Simulating eCommerce transactions in staging environments

• Validating client-side or server-side Luhn checks

• Payment gateway sandbox testing (Stripe, PayPal, Braintree)

• QA automation for transaction flows — for automated security testing of your payment APIs, see Qodex API security testing

• Populating test databases with realistic financial data

Card formats follow global standards and work across regions. Use U.S.-specific test data with the ZIP Code Generator or Routing Number Generator, or add fake user details using the Email Generator and Username Generator.

Legal and Ethical Use

Allowed:

• Form and UI validation in development

• Checkout testing in sandbox environments

• API sandbox integration testing

• Training, demonstration, and tutorial content

Not Allowed:

• Attempting real transactions with generated numbers

• Fraudulent use or deception of any kind

• Bypassing payment security in production systems

Misuse can lead to penalties under laws like the CFAA. Use only in test environments.

Companion Tools for Better Testing

• Email Generator - Unique test email addresses

• UUID Generator - Transaction or user IDs

• Password Generator - Secure form input testing

• Routing Number Generator - U.S. banking workflow testing

• Random Address Generator - Realistic billing addresses

• Credit Card Regex Go Validator - Format validation during input testing

Learn More

• API Security Checklist — essential security practices for payment API integrations

• 15 API Security Best Practices — protect payment data with encryption, tokenization, and secure API design

• Cybersecurity Challenges Facing Fintech — understand the security landscape for payment and financial APIs