How this motion blur test works
Press Start motion test and three strips scroll from left to right at a fixed speed. The top strip carries a high-contrast label, so you can judge how sharp moving text stays. The middle strip shows thin vertical lines on dark grey, the classic pattern for ghosting and overdrive trails. The bottom strip moves grey boxes over a mid-grey background, which makes inverse ghosting (bright or dark "coronas") easy to see.
Choose a Speed of 480, 960 or 1920 px/s. While the strips move, the page measures the time between animation frames over the last two seconds and shows the Measured refresh rate, the Pixels per frame (speed divided by Hz) and the share of Dropped frames. If fewer than 5% of frames are dropped, the result card confirms smooth motion, so any blur you still see comes from the panel, not the browser. Press Fullscreen to remove distractions. If you know the TestUFO site from Blur Busters, this is a similar UFO-style test; everything runs locally in your browser and nothing is uploaded.
How to read the results
- Sharp edges. Follow one object with your eyes. If the label stays readable and the edges are crisp, blur is low.
- Smeared edges. A soft, stretched edge is motion blur. On normal LCD and OLED screens it grows with pixels per frame, so 1920 px/s at 60 Hz looks much softer than at 144 Hz.
- Faint copies behind the lines. These are ghosting trails from slow pixel response. They are usually worst on VA panels in dark transitions.
- Bright or dark outlines on the grey boxes. This is overshoot, also called inverse ghosting or coronas, caused by overdrive that is set too high.
- Dropped frames above 5%. The motion stutters and the test is not reliable. Close heavy tabs and try again.
A phone photo taken with a fast shutter (sport or burst mode) often shows trails more clearly than your eyes do.
How to reduce ghosting and motion blur
- Use the highest refresh rate. In Windows go to Settings → System → Display → Advanced display and pick the top value; on a Mac use System Settings → Displays → Refresh Rate. Check the result with the refresh rate test.
- Tune overdrive in the monitor menu. The setting is often called Overdrive, Response Time, Trace Free or OD. Pick the level with the shortest trails in the middle strip and no bright outlines in the bottom strip; the highest level is rarely the best.
- Turn on VRR. Enable G-SYNC, FreeSync or Adaptive Sync in the monitor and in the GPU control panel. Some monitors change overdrive with the frame rate, so test again at the speed you play at.
- Try a backlight strobing (MPRT) mode. Options such as ULMB, DyAc, ELMB or MPRT flash the backlight and reduce sample-and-hold blur, at the cost of brightness and sometimes flicker.
- Disable motion smoothing and power saving. Turn off TV-style motion interpolation, use the PC or Game picture mode, and plug in laptops, since battery saver can cap the browser at 60 Hz.
Why test motion blur and ghosting
Response time numbers on spec sheets are measured under ideal conditions and rarely tell you how a panel looks in motion. A quick visual test shows whether a new monitor smears in dark scenes, helps you pick the best overdrive level, and lets you compare screens side by side before the return window closes.
Frequently asked questions
What is a UFO test?
UFO test is the popular name for moving-object tests like TestUFO by Blur Busters. This page is a similar test: objects move at a fixed speed so you can judge motion blur and ghosting on your screen.
What is the difference between motion blur and ghosting?
Motion blur is a soft, smeared edge caused mainly by how long each frame stays on screen. Ghosting is a faint copy that trails behind a moving object because the pixels change color too slowly.
What does pixels per frame mean?
It is the speed divided by the refresh rate. The fewer pixels an object jumps per frame, the sharper it looks to your eyes, which is why higher refresh rates reduce blur.
Which overdrive setting should I use?
Use the level with the shortest trails in the middle strip and no bright or dark outlines around the grey boxes. On many monitors this is the middle setting, not the highest.
Why does the test show dropped frames?
The browser missed some frames, usually because of heavy tabs, battery saver or a background window. Above 5% the motion stutters, so close other apps, plug in and measure again.
Can this test measure response time in milliseconds?
No. A browser cannot read the panel's pixel response directly. The test measures refresh rate and dropped frames, and you judge blur and ghosting by eye or with a photo.
Is anything uploaded?
No. The animation and the measurement run entirely in your browser, and no images or data leave your device.