15 tests · runs in your browser
Test your screen, speakers, mic and camera.
Free tests with a plain answer for what your result means and how to fix it. Nothing to install, no sign-up, and nothing you see, say or film leaves your device.
Start with the Dead Pixel TestBench 01
Screen
Monitors, TVs, laptops, phones
- 01Dead Pixel TestFind dead, stuck and hot pixels with full-screen colours.
- 02Stuck Pixel FixerFlash a small square over a stuck pixel to try to free it.
- 03OLED Burn-In TestSpot burn-in and image retention with even grays and colours.
- 04Backlight Bleed TestCheck an LCD for backlight bleed, IPS glow and clouding.
- 05Refresh Rate TestMeasure your screen's real refresh rate in Hz.
- 06Ghosting TestCheck motion blur, ghosting and overshoot on moving shapes.
- 07Touch Screen TestFind dead zones and multi-touch problems on a touchscreen.
Bench 02
Sound
Speakers, headphones, subwoofers
- 08Speaker TestPlay a test sound and fix no-sound problems.
- 09Left Right Audio TestCheck left/right channels and speaker phase.
- 10Headphone TestLeft/right, phase, frequency sweep and bass check.
- 11Subwoofer & Bass TestBass tones and a 20–200 Hz sweep for subwoofers.
- 12Surround Sound TestCheck each speaker of a 5.1 or 7.1 system.
- 13Water EjectA 165 Hz tone that pushes water out of a phone speaker.
Bench 03
Mic & camera
Microphones and webcams
Checklists
For the moments people actually test.
New monitor or TV
Do this inside the return window.
New or second-hand phone
Before you're past the point of returning it.
New speakers or headphones
After setup, before you tidy the cables.
Nothing leaves your device.
Every test runs inside your browser. When the mic or webcam test asks for access, the sound and picture go from your device to this page on your screen and nowhere else. We don't record, upload or store them.