Generate Luhn-valid card numbers for payment testing — clearly fictitious, never usable for real purchases.
Every payment form validates card numbers with the Luhn algorithm before contacting the payment gateway — it catches typos instantly, without a network round-trip. To test that validation, a developer needs numbers that pass the check without belonging to anyone. That is what this tool generates: mathematically valid sequences built on the public prefix ranges of each brand (4 for Visa, 51–55 for Mastercard, 34/37 for Amex).
A generated number cannot make a purchase. Real transactions are authorized by the card network and the issuing bank, which check whether the card actually exists, is active and has funds — a random Luhn-valid number fails all of that. The expiry date and CVV shown here are random values for form-filling only. For end-to-end payment tests, use the official test cards published by your payment provider (Stripe, Adyen, Cielo and others document theirs).
The checker applies the same Luhn algorithm to any number you paste: it doubles every second digit from the right, subtracts 9 from results above 9, sums everything and verifies the total is a multiple of 10. It is a math check, not a card lookup — a "valid" verdict means well-formed, not real.
Luhn check: starting from the rightmost digit, double every second digit; if doubling gives more than 9, subtract 9. Sum all digits — the number is valid when the sum is a multiple of 10.
No. Real charges are authorized by the card network and the issuing bank, which verify that the card exists and has funds. A random Luhn-valid number is refused at that step.
The front-end only runs the Luhn check to catch typos. Acceptance there just means the format is valid — the real verification happens at the gateway.
The official test cards published by your provider. Those numbers are recognized by the sandbox environment and produce predictable results (approved, declined, 3-DS required).
No. They are random values generated only so you can fill required form fields during tests.
No. Generation and the Luhn check run 100% in JavaScript on your device. Nothing is transmitted or stored.
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Vai.la is not responsible for how the tools are used or for decisions made based on their results.