Credit Card Generator
Generate valid test credit card numbers using the Luhn algorithm for Visa, Mastercard, Amex, and more. For development and testing only.
For Testing Purposes Only
These are algorithmically valid test numbers generated using the Luhn algorithm. They are not linked to any real bank account and cannot be used for actual transactions. Use them only for software testing, form validation, and development.
Click "Generate" to create test card numbers
About Credit Card Generator
Credit Card Generator is a free browser-based tool that produces algorithmically valid test card numbers for Visa, Mastercard, American Express, Discover, JCB, and Diners Club. It applies the industry-standard Luhn algorithm — the same checksum formula that real card issuers use — so every generated number passes front-end validation checks for correct prefix, digit length, and check digit. The numbers are mathematically correct but not tied to any bank account, meaning they will never process a real transaction.
Developers and QA engineers reach for this tool when they need realistic card data to test payment forms, validate client-side regex patterns, seed a test database, or exercise edge cases like 15-digit Amex numbers or 14-digit Diners Club numbers without touching actual financial credentials. Beyond the card number, you can generate a matching expiry date, CVV, and a randomised cardholder name in one click — giving you a complete, self-consistent test record ready to drop into a fixture or Postman collection.
All generation runs entirely in your browser using JavaScript. Nothing is sent to a server, stored, or logged, so you can use the tool safely inside a corporate network or on an air-gapped machine. There is no sign-up, no rate limit, and no cost. The tool differs from payment-processor sandbox credentials (like Stripe test cards) in that it works offline and covers multiple networks simultaneously — ideal for building network-agnostic validation logic.
Key Features
Six card networks
Generates valid numbers for Visa (prefix 4, 16 digits), Mastercard (51-55, 16 digits), American Express (34/37, 15 digits), Discover (6011, 16 digits), JCB (3528-3589, 16 digits), and Diners Club (300-305/36/38, 14 digits).
Correct Luhn check digit
Every number ends with a mathematically accurate check digit computed by the modulus-10 algorithm, so it passes any standard Luhn validation function without modification.
Complete card records
Toggle optional fields to include a future expiry date (MM/YY), a CVV of the correct length for the chosen network (3 digits for most, 4 for Amex), and a randomised cardholder name.
Batch generation up to 20
Generate between 1 and 20 test cards in a single click. The first result is rendered as a visual card preview; the full list appears below with per-row copy buttons.
100% client-side — no upload
Card numbers are computed locally in your browser. No data leaves your machine, making the tool safe for use on restricted networks or when handling sensitive test environments.
One-click copy per card or all at once
Copy a single card's details — number, expiry, CVV, and name separated by pipes — or copy every card in the batch to your clipboard with a single button.
How to Use
Select Card Type
Choose a card network from the dropdown: Visa, Mastercard, American Express, Discover, JCB, or Diners Club.
Configure Options
Set how many cards to generate (1-20) and toggle optional fields like expiry date, CVV, and cardholder name.
Generate & Copy
Click "Generate" to create test card numbers, then copy individual entries or all cards at once for use in your test suite.
Example
Selecting Visa and clicking Generate produces a 16-digit number with a valid Luhn check digit, a future expiry, a 3-digit CVV, and a random cardholder name.
Card type: Visa
Count: 1
Include: Expiry, CVV, Name4532 8751 3049 6218 | 09/28 | CVV 471 | Sarah WilliamsCommon Use Cases
- arrow_circle_right
Testing payment form validation
Paste a generated number into a checkout form to verify that your client-side regex, prefix detection, and Luhn check all trigger correctly before connecting a real payment gateway.
- arrow_circle_right
Seeding test databases with realistic fixtures
Populate a development or staging database with dozens of self-consistent card records — number, expiry, CVV, name — without recycling the same Stripe sandbox number in every row.
- arrow_circle_right
Exercising multi-network card logic
Generate one card from each supported network in a single session to confirm your code handles 15-digit Amex numbers, 14-digit Diners Club numbers, and varying CVV lengths without special-casing each manually.
- arrow_circle_right
Offline and air-gapped development
Because everything runs in the browser with no server calls, the tool works without internet access — useful in secure lab environments where payment-processor sandbox APIs are not reachable.
- arrow_circle_right
Teaching and demonstrating the Luhn algorithm
Generate a card, note the full digit sequence, and trace the checksum calculation manually. The correct check digit makes it a concrete, verifiable example for workshops or written tutorials on card number validation.