Credit Card Number Generator

Produce random, Luhn-valid credit card numbers for QA, demos, or sandbox testing. Choose networks, quantity, and formatting.

Test card numbers on demand

Create batches of Visa, Mastercard, Amex, or Discover numbers that satisfy the Luhn checksum. Perfect for QA testers, demo environments, or engineering sandboxes—never for real payments.

Generation settings

Pick networks, quantity, and formatting, then generate sample numbers.

Networks

VisaStarts with 4, typically 16 digitsMastercardStarts with 51-55 or 2221-2720American ExpressStarts with 34 or 37, 15 digitsDiscoverStarts with 6011, 16 digits

Quantity per network (1-10)

Formatting

Plain digits4539038840231234Grouped by spaces4539 0388 4023 1234Grouped by dashes4539-0388-4023-1234

Networks selected: 2Total numbers: 0Format: Spaced groups

Validate an existing number

Quickly check the Luhn checksum and detect the network type.

Responsible usage

Use the generated numbers in QA, staging, or demo environments only.
They do not hold funds and cannot complete real transactions.
Follow PCI and company security policies when handling any real customer data.
Pair the numbers with obvious placeholder names (e.g., Test User) to avoid confusion.

Testing ideas

Automate checkout tests with separate Visa/Mastercard flows.
Verify UX for 15-digit Amex inputs vs. 16-digit cards.
Validate masked input, copy-to-clipboard, and client-side Luhn checks.
Include Discover to confirm wallet or BNPL integrations support it.

Generate Luhn-Valid Test Card Numbers Instantly

Developers and QA engineers use this tool to generate structurally valid credit card numbers for Visa, Mastercard, American Express, and Discover. Every number satisfies the Luhn checksum algorithm, making them ideal for testing payment form validation, checkout flows, and sandbox environments. Nothing is stored or transmitted — generation happens entirely in your browser.

QA & sandbox testing

Why Use This Tool?

Luhn algorithm validated

Every generated number passes the Luhn checksum, so it will be accepted by any standard card-format validator in your test environment.

Four major networks

Generate numbers for Visa, Mastercard, American Express, and Discover in plain, spaced, or dashed format to match your UI field requirements.

Bulk batch generation

Create up to 10 numbers per network at once. Download the full batch as a .txt file for use in automated test suites or test data fixtures.

Built-in Luhn validator

Paste any card number to verify its Luhn checksum and detect the network type — useful for debugging real test data or checking third-party fixtures.

How this Credit Card Number Generator works

The Credit Card Number Generator produces mathematically valid test credit card numbers entirely within your browser for software development and testing purposes. The algorithm constructs numbers that pass the Luhn checksum validation by selecting an appropriate Issuer Identification Number prefix for your chosen card network — Visa, Mastercard, American Express, or Discover — and then generating the remaining digits with a valid check digit appended at the end.

Generated numbers follow the correct length and prefix conventions for each card type: 16 digits starting with 4 for Visa, 16 digits starting with 51-55 for Mastercard, 15 digits starting with 34 or 37 for Amex, and 16 digits starting with 6011 for Discover. The tool can also generate accompanying test expiration dates and CVV codes. These numbers are strictly for testing payment form validation and cannot be used for actual transactions.

All number generation occurs on your local device using client-side JavaScript with absolutely no server communication. This ensures that generated test data stays on your machine and is never logged or stored remotely. Developers building e-commerce platforms, payment gateways, or checkout flows will find this tool indispensable for quality assurance testing.

How to use this Credit Card Number Generator

Choose card networks

Select Visa, Mastercard, Amex, or Discover profiles you want to test.

Generate sample numbers

Pick how many per network and your preferred formatting style.

Copy, download, or validate

Export everything for QA or validate an existing number with the Luhn check.

Example Usage

A batch of formatted Visa and Mastercard samples for checkout testing.

Input

Visa + Mastercard · 3 each · spaced

Output

Visa · 4539 0388 4023 1234

Frequently Asked Questions

What does a Credit Card Number Generator do?

It generates test card numbers that follow the Luhn check (a validation rule). Developers use these numbers to test payment forms and validation logic.

Are generated credit card numbers real?

No. These are not tied to real bank accounts and cannot be used for legitimate purchases. They exist for testing and educational use only.

What is the Luhn algorithm?

The Luhn algorithm is a checksum used to validate number formats like credit cards. Passing Luhn means the number structure is valid, not that the card is real.

Can I use these numbers for live payments?

No. Use your payment provider's official test environment and test cards for end-to-end checkout testing. Never attempt to use generated numbers for fraud.

Is this Credit Card Number Generator safe to use?

Yes. It runs 100% client-side, so generation happens in your browser and nothing is sent to a server.

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The Credit Card Number Generator is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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