Motion Blur Test — Free Online Test
Our Motion Blur Test animates high-contrast patterns across the screen at varying speeds so you can visually judge pixel response time, motion clarity, and ghosting on your monitor. It is the browser-based equivalent of UFO-style tests used by professional reviewers.
How to use the Motion Blur Test
- Set your monitor to its highest supported refresh rate before starting.
- Watch the moving pattern and focus on trailing edges.
- Compare different speeds and patterns to identify ghosting or inverse ghosting.
How to interpret your results
A fast panel (1-4 ms GtG) shows crisp motion with almost no trailing edge. Slower panels show a smeared trail behind moving objects. Inverse ghosting (a bright halo ahead of the object) indicates over-aggressive overdrive.
Common issues and what they mean
Heavy trailing on moving object
Slow pixel response. Enable your monitor's Overdrive or Response Time setting to Medium.
Bright halo ahead of object
Overdrive is too aggressive. Reduce it one step.
When to run this test
- Before buying a gaming monitor.
- When tuning overdrive settings.
What motion blur actually is on a modern display
Almost every LCD and OLED sold today is a sample-and-hold display: each frame is held statically on the panel until the next one replaces it. Your eyes, meanwhile, track a moving object smoothly and continuously. During the time a frame is held, your gaze slides across a static image, and the brain integrates that mismatch as a smear. This persistence blur exists even on a panel with a theoretically instant pixel response, which is why an OLED at 60 Hz still shows visible trailing.
The second contributor is pixel transition time — how long a liquid crystal cell takes to twist from one grey level to another. Manufacturers quote this as grey-to-grey (GtG) in milliseconds, usually citing the single fastest transition rather than the average. A panel advertised at 1 ms GtG can still take 12 ms or more for dark-to-dark transitions, which is exactly where black smearing on VA panels comes from.
Overdrive is the panel firmware's attempt to shorten those transitions by briefly overshooting the target voltage. Tuned well, it removes trailing. Tuned too aggressively, the pixel overshoots past the target and produces a bright halo ahead of the moving object — inverse ghosting, or overshoot. This test makes both failure modes visible side by side so you can find the setting that balances them.
Reading the pattern like a reviewer
Track the moving object with your eyes rather than staring at a fixed point on the screen. Eye tracking is how you consume real motion in games and video, and it is the condition under which persistence blur appears. If you instead fixate on the centre of the screen, you are testing something different — how the panel smears against a stationary retina — which mostly reveals response-time problems.
Watch the trailing edge first. A soft, evenly fading tail behind the object indicates slow transitions. Then watch the leading edge: a bright outline in front of the object means overdrive overshoot. On VA panels, look specifically at dark objects on dark backgrounds, where the black smear is longest and most objectionable.
Finally, change speed. Slow patterns expose coarse stepping and frame pacing problems; fast patterns expose response time. A monitor that looks clean at low speed but collapses at high speed is response-time limited, not refresh-rate limited.
Settings worth changing before you conclude the panel is bad
Confirm the display is actually running at its rated refresh rate. Windows frequently defaults a 144 Hz monitor to 60 Hz after a driver update, and macOS can drop an external display to 60 Hz when bandwidth is constrained by a hub or a low-spec cable. Our Refresh Rate Test measures the real value the browser receives.
Then step through the overdrive setting one level at a time, re-running this test after each change. Most monitors have three or four levels labelled Off, Normal, Fast and Extreme, or Level 1 to 3. In practice the middle setting is correct on the large majority of panels, and the top setting is included largely for spec-sheet reasons.
If your monitor has backlight strobing — marketed as ULMB, ELMB, DyAc, MPRT or Motion Blur Reduction — try it after you have settled overdrive. Strobing cuts persistence blur dramatically by turning the backlight off between frames, at the cost of roughly half the brightness and, on some panels, a visible flicker that sensitive viewers perceive as eye strain.
Frequently asked questions
Does higher refresh rate always mean less blur?
Yes on sample-and-hold displays — 120 Hz shows about half the perceived blur of 60 Hz.
Can a browser test replace a high-speed camera measurement?
No. A browser test shows perceived motion clarity as your eyes see it, which is what matters day to day, but published grey-to-grey figures come from photodiode rigs that a web page cannot replicate.
Why does motion look worse in a browser than in a game?
Browsers composite through the desktop window manager, which can add a frame of buffering. Judge relative differences between overdrive settings rather than absolute numbers.