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Luhn / Credit Card Validator

Validate credit card numbers using the Luhn checksum.

Free · Runs in your browser · Last updated

Validation
Card brand guess

No data leaves your browser. Test numbers only — never enter real cards.

About this tool

Check whether a number passes the Luhn algorithm — used by all major credit card networks. Detects card brand from BIN.

Privacy

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.

Frequently asked questions

Is the Luhn Checker free to use?

Yes. Luhn Checker is completely free for both personal and commercial projects. There are no usage limits, no sign-up, and no premium tier.

Is my data safe when I use Luhn Checker?

All processing happens locally in your browser using JavaScript. Your input is never uploaded to our servers, logged, or shared with any third party.

Does Luhn Checker work offline?

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.

Which browsers are supported?

Luhn Checker works in all modern browsers, including the latest versions of Chrome, Firefox, Safari, Edge, Brave, and Opera, on desktop and mobile.

Do I need to install anything?

No. Luhn Checker runs in any modern web browser with no installation, browser extension, or account required.

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