Track a moving block with your eyes. A clean panel keeps it sharp; a slow one trails. Use ↑/↓ to change speed and Esc to exit full-screen.
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Ghosting test: check monitor motion blur and pixel response
This ghosting test moves objects smoothly across your screen so you can see how well your monitor keeps up with motion. Trails, smearing or a faint double image behind a moving object are signs of slow pixel response (ghosting) or badly tuned overdrive (inverse ghosting, seen as a bright halo). Adjust the speed and background, follow the moving blocks with your eyes, and judge how clean the motion looks. All in the browser, nothing to install.
How to test for ghosting
Start the animation and track a moving block with your eyes as it crosses the screen. On a fast panel the block stays sharp; on a slower one you'll see a smeared trail behind it, strongest against high-contrast backgrounds. Try different speeds (faster motion makes ghosting more obvious) and different background colours, since dark-to-light transitions often reveal the worst response times.
Ghosting vs inverse ghosting (overdrive)
Ghosting is a soft trail left because pixels can't change colour fast enough. Monitors fight it with overdrive, which pushes pixels harder to switch quicker. Too much overdrive overshoots and produces inverse ghosting, a bright or inverted halo ahead of or behind the object. The goal is a middle overdrive setting (often labelled "Normal" or "Medium") that minimises both. Use this test to compare your monitor's overdrive modes and pick the cleanest one.
What affects motion clarity
Pixel response time, refresh rate and overdrive all play a part. A higher refresh rate shortens how long each frame is shown, which reduces perceived blur, while response time governs how fast pixels actually change. Some monitors also offer a backlight-strobing mode (ULMB, DyAc and similar) that sharpens motion further at the cost of brightness. This test helps you see the combined result.
Everything runs on your device
The animation is generated locally in your browser; nothing about your screen is uploaded. For the clearest view, run it full-screen at your monitor's native resolution and highest refresh rate.
Frequently asked questions
Start the moving animation and follow a block with your eyes as it crosses the screen. A fast panel keeps it sharp; a slower one leaves a smeared trail behind it. Increase the speed and try high-contrast backgrounds to make any ghosting easier to see.
Ghosting is a soft trail left because pixels change colour too slowly. Inverse ghosting is a bright or inverted halo caused by too much overdrive pushing the pixels past their target. A moderate overdrive setting usually minimises both.
Adjust the overdrive setting (often called Response Time, Overdrive or OD) in your monitor's menu and use this test to compare modes. Pick the one with the least trailing and no bright halo. Running at a higher refresh rate and enabling any backlight-strobing mode can further sharpen motion.
Indirectly, yes. A higher refresh rate shows each frame for less time, which reduces perceived motion blur, but the panel's actual pixel response time still governs true ghosting. The two work together, which is why fast gaming monitors pair a high refresh rate with quick response times.
No. The animation runs entirely in your browser and nothing about your display is recorded or sent anywhere. There's no sign-up, and it works offline once loaded.