About

What DeviceCheck is, who it is for, and why every test on the site runs entirely inside your browser without recording anything you press or touch.

What DeviceCheck is

DeviceCheck is a small set of hardware testers that run in a web page: a keyboard tester, a mouse tester, a dead pixel test, and a touch screen test. They exist for the moment when a key stops responding, a mouse starts double-clicking on its own, a monitor arrives with a suspicious dot, or a phone screen registers taps you did not make, and you want a fast answer before you open a support ticket, return a product, or buy a replacement.

Who it is for

Anyone checking a device they own or are about to buy: people testing a second-hand laptop, gamers checking key rollover before a tournament, IT staff triaging a "my keyboard is broken" ticket, and buyers verifying a new monitor inside the return window. No account, no install, no sign-up.

How it works

Everything runs client-side. The page listens to the same keyboard, mouse, and touch events any website can see, draws the result on screen, and that is the end of it. Nothing you press, click, or touch is sent to a server, stored, or shared. There are no analytics scripts, no cookies set by us, and no external fonts or trackers; you can confirm this in your browser's network tab. If you close the tab, every result is gone.

Browsers deliberately limit what a web page can see about hardware, so some things (true switch latency, low-level firmware faults, keys the operating system reserves) cannot be measured here. Each tool says so plainly where that applies rather than inventing a number.

Found a bug or want another tester? Use the contact page.

Last updated 2026-09-15. Everything on this page runs in your browser. Nothing you type or upload leaves your device.