Every payment form runs a quick sanity check before it ever contacts a card network — the Luhn checksum. It catches typos and garbled numbers instantly, without needing to talk to a bank. This tool lets you see that same check in action.
What Is the Credit Card Validator?
The Credit Card Validator is a security-category tool that checks a card number’s Luhn checksum, detects its likely network (Visa, Mastercard, Amex, Discover, Diners Club, JCB, UnionPay) from its prefix, and can generate a clearly-labeled fake test number for exercising your own form validation.
How to Use It
- Open the tool at /tools/credit-card-validator.
- Type or paste a card number — spaces and dashes are ignored automatically.
- Watch the badge update in real time as you type, along with the network and length breakdown.
- Click “Generate test number” for a random Luhn-valid Visa-style sandbox number, or use one of the well-known example buttons.
Key Features
- Real-time Luhn validation as you type, with no submit button.
- Network detection via publicly documented BIN prefix ranges.
- Safe test-number generator, explicitly for sandbox/QA use only.
- 100% client-side — nothing you type is sent to a server or logged anywhere.
When to Use This Tool
- Building or debugging a payment form and want to confirm your own Luhn-check logic.
- QA testing a checkout flow where you need a plausible, non-real card number.
- Learning how card numbers are structured, including network prefixes and check digits.
Try It Now
Open Credit Card Validator directly, or press ⌘K and type the tool name from anywhere on the site.
Part of the Security & Validators collection on WebdevToolbox — free, browser-based developer tools with no login required.