Ghosting Test: Check Monitor Motion Blur & Response Time Online
Ghosting is the smear or colored trail that follows moving objects when a panel’s pixels can’t switch fast enough. This free test sends boxes across your screen at four fixed speeds (480-3840 px/s) over black, gray, checkerboard and striped backgrounds — the same conditions that expose smear, corona and inverse ghosting in a lab.
How to read the moving tracks
Press F for fullscreen and watch the fastest track first. A healthy fast panel shows a box with slightly soft leading and trailing edges; a slow panel drags a visible gray or colored smear behind it. Now switch the background: gray makes moderate response-time errors obvious, while black and the checkerboard stress the biggest black-to-white transitions. If the trail inverts — a bright halo ahead of the box and a dark wake behind — that is inverse ghosting, the signature of overdrive turned too high.
Each track also carries a static reference box at its left edge. A display with no motion artifacts looks identical moving and still; the wider the visible difference, the worse the response time. For a defensible measurement, film the screen with a smartphone following the box at matching speed (a pursuit camera): frame-by-frame, count how many pixels the smear extends — under ~4 px is excellent, ~10 px noticeable in games, 20+ px headache-inducing.
Fixing ghosting: overdrive and beyond
Ghosting is managed by your monitor’s overdrive (response-time) setting, usually named Overdrive, OD, Trace Free or Response Time in the OSD. Run this test at each level: the goal is the least smear without a corona (bright rim) or inverse trail. Overdrive that is perfect at 60 Hz is often too strong at 144 Hz — retest whenever you change refresh rate, and prefer the manufacturer’s profile for your panel’s current Hz.
Not every trail is overdrive’s fault. Cables and ports matter: an old or bad cable forces the scaler to re-sync and can add stutter that mimics smear. "Motion blur reduction" features (backlight strobing) trade brightness for clarity — try them with this test. And if you want the numbers behind the artifacts, the refresh rate test measures your real Hz and frame-time consistency first, because response-time settings only behave as specified when the panel actually runs at its rated speed.
Frequently Asked Questions
How do I test my monitor for ghosting?+
Open the ghosting test, press F for fullscreen and follow the moving boxes at each speed. A visible smear or trail behind a box indicates slow pixel response; compare trails across the black, gray and checkerboard backgrounds to see the effect in different transitions.
What causes ghosting on a monitor?+
Pixels that cannot fully switch between colors within one refresh cycle. Panel technology sets the baseline (TN fast, IPS moderate, VA slowest in dark transitions), and the overdrive setting then tunes it — too little leaves smear, too much creates inverse ghosting with bright halos.
What is inverse ghosting?+
Overdrive pushed past its useful range: pixels overshoot the target color and bounce back, printing a bright rim or trail ahead of moving objects instead of behind them. Lower the overdrive level one step in the OSD until the halo disappears.
Which background should I use for the ghosting test?+
Gray is the most sensitive for everyday response-time errors. Black reveals dark-transition smear typical of VA panels, and the checkerboard stresses the full black-white range. Test all of them — different panel weaknesses appear on different backgrounds.
Can a better cable fix ghosting?+
Rarely. Ghosting comes from pixel response, not bandwidth. But a failing cable or adapter can cause stutter and re-syncs that look like motion smearing, so rule that out before blaming the panel.
Is ghosting worse at higher refresh rates?+
The artifacts change: at high Hz, the same overdrive setting can become too aggressive. If you switch from 60 to 144 Hz and see new halos around moving objects, open the OSD and select the overdrive profile intended for the higher rate.