Validate credit card numbers using the Luhn checksum.
Free · Runs in your browser · Last updated
No data leaves your browser. Test numbers only — never enter real cards.
Check whether a number passes the Luhn algorithm — used by all major credit card networks. Detects card brand from BIN.
All processing for Luhn Checker happens locally inside your browser using JavaScript. Your input is never uploaded to a server, logged, or shared with third parties.
Yes. Luhn Checker is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.
All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.
Once the page has loaded, the tool runs entirely client-side. You can disconnect from the internet and it will keep working in the same browser tab.
Luhn Checker works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.
No. Luhn Checker runs in any modern web browser with no installation, browser extension, or account required.