Test your screen, mic, camera and controllers in seconds

Free tools that check your devices right in your browser. No downloads, no sign-up, and nothing you test ever leaves your device.

Screens

White screenBright full-screen white for light, cleaning and checks Black screenPure black to check bleed, glare and bright pixels Blackout screenLooks switched off; music and downloads keep running Dead pixel testFind dead or stuck pixels, fixer and refresh rate Online rulerActual-size ruler in cm, mm and inches Red screenPure red for night light, pixel checks and photography Green screenChroma-key green backdrop for video and photos Blue screenPure blue for pixel checks and video backdrops Pink screenSoft pink light for selfies, calls and mood lighting Purple screenPurple glow for setups, streams and backgrounds Yellow screenBright yellow for warm light and colour checks Orange screenWarm, low-blue glow for evenings and photos Grey screenMid grey to spot clouding and uneven brightness

Audio and video

Mic testLive level meter, waveform and 5-second playback Webcam testLive preview, resolution, frame rate and snapshot Sound testLeft/right check, frequency sweep and bass tones

Input devices

Keyboard testerLight up every key, find dead keys and test rollover Typing testTyping speed in WPM, accuracy and errors Mouse testButtons, double-click fault, wheel and polling rate DPI analyzerMeasure your mouse's real DPI Controller testerButtons, triggers, sticks, drift and vibration Click speed test (CPS)Clicks per second over 1 to 60 seconds Aim trainerHit targets in 30 s: speed and accuracy Spacebar clickerCount spacebar presses against the clock Click counterTally counter: tap or press Space to count Reaction time testWait for green, click fast, get your average

Our privacy promise

Every test on DeviceCheck runs inside your web browser. When you test your microphone or webcam, the sound and picture are analysed on your own device and are never uploaded, recorded on a server or seen by anyone else. Recordings and snapshots stay with you, and devices switch off as soon as you stop a test or leave the page.

The only things we keep are your best scores in games like the click speed test and the typing test, your tally counts and your ruler calibration, saved in your own browser so they're there next time.

Which test do I need?

Getting ready for a video call? Run the mic test and webcam test, then check your headphones with the sound test.
Bought a new monitor, TV or phone? Use the dead pixel test and the black screen to look for faults while you can still return it.
Need light? A white screen makes a soft face light; the blackout screen makes your screen look switched off.
Gaming kit playing up? The controller tester checks for stick drift, the mouse test finds faulty double-clicks, and the keyboard tester shows dead keys.

Questions

Is DeviceCheck free?

Yes. Every test and screen tool on DeviceCheck is free to use, with no account, sign-up or download.

Are my microphone and webcam recordings uploaded?

No. Every test runs inside your web browser. Sound and pictures are analysed on your own device and are never uploaded, recorded on a server or seen by anyone else.

Does DeviceCheck work on phones and tablets?

Yes, it works in any modern browser on computers, phones and tablets. Tests for keyboards, mice and game controllers need that device connected to the phone, tablet or computer you are using.

Who runs DeviceCheck?

DeviceCheck is a site by Classfern, a small UK business (Classfern Ltd, company number 17569800), which also runs the free teacher site lessonplanner.info.