Online Tool Store
Credit Card Test Number Generator
Generate Luhn-valid, non-real credit card numbers by network for testing payment forms and integrations. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
⚠️ These pass the Luhn checksum used for basic format validation but are not real, chargeable card numbers — for testing payment forms and integrations only, never for real transactions.
How it works
- Choose a card network and how many numbers you need.
- Click "Generate test numbers" for Luhn-valid, non-real numbers.
- Copy them into your test environment.
The formula
From the right: double every second digit, subtract 9 if over 9
Check digit = (10 − (sum of all digits mod 10)) mod 10
FAQ
Are these real credit card numbers?
No — they're randomly generated numbers that pass the Luhn checksum algorithm (the same basic format check real payment processors use), built from each network's publicly documented prefix ranges. They are not tied to any real account and cannot be charged.
What is the Luhn algorithm?
A simple checksum formula used to catch accidental typos in card numbers — it doubles every second digit from the right, subtracts 9 from any result over 9, sums everything, and the final check digit makes the total a multiple of 10. Real card numbers must pass it, but passing it alone doesn't mean a number is real or valid for payment.
What should I use these for?
Testing a payment form's client-side validation, format masking, or card-type detection during development — never for attempting real transactions, which will be declined or rejected by any real payment processor.
Is any data sent anywhere when I generate numbers?
No — every number is generated locally in your browser. Nothing is uploaded or logged.
How we compare
| Feature | Online Tool Store | Payment provider sandbox docs | Manually typing digits |
|---|---|---|---|
| Generate several at once, any network | ✓ | Usually a fixed short list | Rarely passes Luhn by accident |
| No provider account needed | ✓ | ✓ | ✓ |
For quickly generating a batch of client-side test values across multiple card networks, this is faster than hunting through each provider's own docs.