Test Credit Card Number Generator (Luhn-Valid)

Generate test credit card numbers for payment-flow development. Numbers pass Luhn validation (so client-side checks won’t reject them) but come from sandbox BIN ranges — they’re rejected by real payment processors and won’t accidentally authorize charges. Includes the published Stripe / Adyen / Braintree test cards alongside randomly-generated valid sandbox numbers.

Published test cards (Stripe, Adyen, Braintree)

How to use the Test Credit Card Number Generator (Luhn-Valid)

Pick a brand and count. Generated numbers start with the brand’s sandbox BIN (Visa: 4242 prefix), get random middle digits, and end with a calculated Luhn check digit. Each row includes a randomly-generated CVV and expiry that pass syntactic validation. Use these in your dev environment’s payment forms to test the happy path without making real charges.

The published test cards table lists the official sandbox numbers from major processors with their special behaviors (always succeed, always decline, requires 3DS challenge, etc.).

About Test Credit Card Number Generator (Luhn-Valid)

Payment processors maintain reserved card-number ranges (BINs) that pass all client-side validation but are rejected at the network layer. Stripe’s 4242 4242 4242 4242 is the most famous — it passes Luhn, looks like a real Visa, and is recognized by every Stripe SDK as a test card that always succeeds. Other test BINs trigger specific scenarios: 4000 0000 0000 0002 always declines, 4000 0027 6000 3184 triggers 3D Secure, 4000 0000 0000 9995 simulates insufficient funds.

This generator emits two kinds of numbers: (1) random Luhn-valid numbers in the sandbox BIN ranges, useful for filling forms with novel-looking but harmless card numbers; (2) the canonical published test cards from Stripe, Adyen, Braintree, etc., with their documented behaviors. For most dev workflows, the published cards are what you want — they trigger predictable backend responses.

Common use cases

  • E-commerce checkout dev — test success, decline, 3DS, refund flows.
  • Form validation testing — confirm Luhn checks pass on real-looking input.
  • Demo / training data — populate sample order data with valid-looking card numbers.
  • QA test fixtures — deterministic test data for payment integration tests.

Frequently asked questions

Will these work on a real payment form?
No \xE2\x80\x94 real processors reject sandbox BINs before any authorization. They're for development use only.

What's the difference between Luhn-valid and processor-valid?
Luhn is a 1960s checksum that catches typos. Processors do Luhn first, then check the BIN against issuing-bank records. Sandbox BINs pass Luhn but are flagged as test.

Are the CVVs and expiries also fake?
They're random valid-looking values. Real CVVs are tied to the specific card's magnetic strip / chip data; for sandbox cards, any 3- or 4-digit CVV is accepted (or rejected) by the processor as part of its test behavior.