Card number checker
Check a card number with the Luhn formula, see which card network it belongs to, and find the check digit that makes it valid. Built for testing checkouts and forms. Free, no sign-up, and the number never leaves your browser.
- 1Your card appears in your app
- 2Tap it to pay in a shop
- 3See every payment as it happens
You don't need a real card: the starting number is a common test number. Nothing you type is sent anywhere or added to the share link.
What the digits mean
The first digit points to the network: 4 for Visa, 5 and some ranges starting with 2 for Mastercard, and 34 or 37 for American Express. The first six to eight digits together are the BIN, which identifies the company that issued the card. Most cards have 16 digits, but the standard allows 8 to 19, and American Express cards have 15.
The check digit
The last digit is worked out from the others using a simple formula called the Luhn check. If someone mistypes one digit, the check usually fails, so a checkout can flag the error before trying the payment. Passing the check does not mean a card is real or has money on it.
See it happen
Your own money app- 1Name it and pick your colours
- 2Choose what it does
- 3Launch when you are ready
Try it
Name your platform and watch it come to life
Type a name, tap a colour and pick what it does. The phone changes as you go.
Colour
What it does
Design and preview your whole platform free, then launch when you are ready.
Issue your own branded cards
SendPay platforms can issue branded Visa cards to your customers, powered by licensed partners.