Device tests

Quick checks for your keyboard, controller, screen and browser. Everything runs in your browser and nothing is sent anywhere.

Find out whether every key on your keyboard works. Pressed keys light up on a virtual…

Check an Xbox, PlayStation, Switch or generic controller in your browser. See every…

See your screen resolution, the real number of physical pixels, the device pixel ratio…

See the user agent string your browser sends to every website and what it means: browser…

Fill your screen with solid colours to spot dead, stuck or hot pixels on a monitor…

Check whether every part of a phone, tablet or touch-screen laptop responds. Draw over a…

Find out at how many hertz your screen is really running. The test measures the time…

Check that your left and right speakers or headphones are connected correctly, and hear…

Guides

Learn how to test gamepad controller online in 2 minutes: check buttons, triggers, sticks and drift with a free browser tool, no…

1080p vs 1440p vs 4K explained in plain language: pixel counts, sharpness, gaming vs work, and which resolution is right for your…

Learn how to test your keyboard online in 2 minutes — find dead keys, detect ghosting and check N-key rollover with a free…