Display & camera
Find dead or stuck pixels, measure the real refresh rate, check gradients and motion clarity, and make sure your camera delivers the image you expect.
- Dead Pixel TestCheck your monitor, laptop or phone screen for dead pixels, stuck pixels, backlight bleed and uneven colour with full-screen solid colours and patterns. Open tool
- Pixel HealerTry to fix stuck pixels on your monitor or phone for free. The pixel healer flashes rapidly changing colours over the stuck pixel for 10–30 minutes. Open tool
- Refresh Rate TestMeasure your screen's real refresh rate in Hz. Confirm a 120, 144, 165 or 240 Hz monitor is set correctly, and see frame time, jitter and dropped frames. Open tool
- Gradient & Banding TestTest your display for colour banding, crushed blacks, clipped whites and gamma with gradient, grey-step, black level, white level and RGB patterns. Open tool
- Ghosting TestCheck your monitor for ghosting, motion blur and overdrive inverse ghosting with a moving test object on dark, medium and light backgrounds at several speeds. Open tool
- Input Lag TestEstimate input lag in your browser from click to frame, then measure true end-to-end latency with your phone's slow-motion camera and our built-in calculator. Open tool
- Backlight Bleed TestCheck your monitor or laptop for backlight bleed, IPS glow, clouding and uneven brightness with full-screen dark and grey patterns. Mark problem areas as you go. Open tool
- Monitor CalibrationCalibrate your monitor without a colorimeter. Six guided test patterns help you set brightness, contrast, gamma, sharpness, grey balance and colour. Open tool
- Webcam TestTest your webcam online in seconds. See a live preview, the real resolution and frame rate, switch cameras and save a snapshot. Private: video never leaves your device. Open tool
Fix guides
- Webcam Not Working? How to Fix a Black or Missing CameraFix a webcam that shows a black screen, is not detected or is blocked in Chrome, Edge, Safari, Zoom or Teams. Permission, privacy and driver fixes.
- Dead Pixel vs Stuck Pixel: How to Tell and What to DoLearn the difference between dead and stuck pixels, how to find them with a screen test, when a pixel fixer helps and when to claim warranty.
- Monitor Flickering? How to Stop Screen FlickerFix a flickering monitor or laptop screen. Check refresh rate, cables, adaptive sync, brightness PWM, drivers and HDR settings step by step.
- 144 Hz Monitor Only Showing 60 Hz? How to Fix ItFix a 120, 144, 165 or 240 Hz monitor that runs at 60 Hz. Change display settings, use the right cable and port, and update graphics drivers.
- 60 Hz vs 144 Hz vs 240 Hz: what refresh rate do you need?Compare 60 Hz, 120/144 Hz and 240 Hz monitors: how much smoother they look, what graphics card you need, which cable to use and how to check your monitor runs at its full refresh rate.