Monitor Test

Dead pixels, refresh rate (Hz) and ghosting — test your screen in the browser, no install.

Check your monitor in seconds — hunt for dead or stuck pixels with full-screen color fills, estimate your refresh rate, and spot ghosting or motion blur. No install, runs right in the browser.

Tip: run it in full screen at 100% zoom with the lights dimmed. The refresh-rate figure is an estimate — a browser can't measure faster than your display actually refreshes, and background tabs are throttled.

Dead pixel test

Cycle solid red, green, blue, white and black to find stuck or dead pixels.

Refresh rate test

Estimate your screen's refresh rate (Hz) from real frame timing.

Ghosting test

A moving block reveals trailing, ghosting and motion blur.

More hardware tests

Keyboard Test Mouse Test Microphone Test Sound Meter Webcam Test Speaker Test White Screen Gamepad Test Touch Screen Test Polling Rate Test Pixel Fix

About This Content

Free online monitor test to check your screen in seconds. Run a dead pixel test with full-screen color fills to catch stuck or dead pixels, measure your display's refresh rate in Hz, and spot ghosting or motion blur with a moving-block test. Everything runs right in the browser — no download, no install, works on any laptop, PC or external monitor. Perfect before buying a used display or checking a brand-new one.