Luhn Checksum Validator

Check whether a number passes the Luhn checksum used by payment cards and IMEIs — for developers testing checkout forms with test numbers. Checks the checksum only. Runs in your browser.

Runs in your browser — your file never leaves your device

Frequently asked questions

Is Luhn Checksum Validator free to use?

Yes — Luhn Checksum Validator is completely free with no limits, no watermarks and no sign-up. It runs in your browser, so there is nothing to pay for.

Are my files uploaded or stored anywhere?

No. This tool does all its work locally in your browser using your own device's power. Your files never leave your device and we never see them.

Do I need to install anything or create an account?

No installation and no account needed. Luhn Checksum Validator works on any modern browser — Windows, Mac, Linux, Android and iPhone.

How do I use Luhn Checksum Validator?

Open the tool, add your file (or paste your content), adjust any options, then press “Validate number”. Your result is ready to download in seconds.

Related tools

Palindrome Checker

Is it the same backwards?

IP Address Converter

Dotted IP ↔ integer, hex & binary.

Meta Tag Generator

Title, description, Open Graph & Twitter tags.

robots.txt Generator

Crawler rules + sitemap line in seconds.

Fill PDF Form

Fill in interactive PDF form fields and download.

Wallpaper Calculator

Rolls needed for a room.