Test Credit Card Number Generator
This tool generates fake, Luhn-valid credit card numbers for software testing — Visa, Mastercard, and American Express formats, with optional random CVV and expiry fields, up to 100 at a time. The numbers pass the checksum validation that payment forms perform client-side, which makes them ideal for exercising form validation, masking, and formatting logic.
These numbers are mathematically valid but are not connected to any real account, bank, or cardholder: they cannot be charged and cannot make purchases. For end-to-end payment flows, use the official test cards published by your payment processor (Stripe, Adyen, PayPal, and others) in their sandbox environments.
How to use Test Credit Card Generator
- Select a card type: Visa, Mastercard, or American Express.
- Choose how many numbers to generate (1–100).
- Toggle whether to include a random CVV and expiry date.
- Press Generate Cards and copy the results — one card per line, comma-separated fields.
How test numbers are generated (the Luhn algorithm)
Real card numbers carry an internal checksum defined by the Luhn algorithm (mod-10): doubling every second digit and summing must produce a multiple of ten. This generator picks the correct industry prefix (4 for Visa, 5 for Mastercard, 3 for Amex), fills the middle digits randomly, and computes the final check digit so the number passes any Luhn validator. Amex numbers are 15 digits; Visa and Mastercard are 16.
Legitimate uses
- Testing checkout form validation, input masking, and card-type detection.
- Populating demo environments and screenshots without exposing real card data.
- Unit tests for Luhn validation and formatting utilities.
- Load-testing form submission handling in development systems.
Related terminology
- Luhn algorithm
- The mod-10 checksum formula (invented 1954) that card numbers must satisfy; it catches typos, not fraud.
- IIN / BIN
- Issuer Identification Number — the leading digits identifying the card network and issuing bank.
- PAN
- Primary Account Number — the full card number printed on a card.
- CVV / CVC
- The 3–4 digit card verification value; the random CVVs generated here are placeholders with no meaning.
- Sandbox
- A payment provider's isolated test environment, which accepts that provider's designated test card numbers.
Frequently asked questions
- Can these card numbers be used to buy anything?
- No. They are random digits with a valid checksum — no bank account, credit line, or cardholder exists behind them. Any real authorization attempt is declined by the payment network.
- Why do the numbers pass validation in my checkout form?
- Client-side validators only check the length, prefix, and Luhn checksum, and these numbers satisfy all three. Actual payment requires authorization by the issuing bank, which these numbers can never obtain.
- Which numbers should I use for Stripe or PayPal sandbox testing?
- Use the specific test numbers each provider publishes (for example Stripe's 4242 4242 4242 4242) — sandboxes are programmed to accept those and simulate outcomes like declines. This generator is for validation-layer testing, not processor sandboxes.
- Is generating test card numbers legal?
- Generating Luhn-valid random numbers for development and testing is standard industry practice. Attempting to use any number you do not own for real transactions is fraud — this tool exists strictly for software testing.