Monitor Ghosting Test & Motion Blur Test — Screen Response Checker
Test your screen with our free online ghosting test and motion blur checker. Run the moving UFO test to spot pixel trailing, check your monitor response time, and measure your reaction speed all on one page.
1Display Reaction Time & Screen Response
Wait for the red screen to turn green, then click or tap as fast as you can. This test measures your combined reaction time and monitor response lag across multiple rounds.
⚡ Reaction Tiers
Example data — run the test to see your results
📋 Recent Results
No tests completed yet.
2Motion Blur Test & Ghosting Test
Watch the moving shape sweep across the canvas. A fast gaming monitor keeps edges sharp. Slower screens leave a smeared trail (motion blur) or a faint duplicate image behind the object (ghosting). Use this visual ghosting test to inspect display clarity at different speeds.
3UFO Ghosting Test & Pixel Response
Run the classic UFO ghosting test with multiple speed rows to compare trailing side by side. Switch to Flash Mode to blink between black and white, giving you a quick visual check of how fast your monitor pixels turn on and off.
Reaction Time vs. Screen Response Time
Reaction time is how fast your brain and muscles respond to what you see — most adults react to a visual signal in 200 to 250ms. Screen response time is separate: it is how fast your monitor pixels physically switch colors, which takes just a few milliseconds. This test measures the total time, so a slower screen slightly increases your scores. You can also measure your pure reflexes alone with our reaction time test.
What Causes Motion Blur and Ghosting
Motion blur happens because pixels take time to transition between colors, creating a soft smear around moving objects. Monitor ghosting is a distinct trailing shadow left behind when pixels switch too slowly or when overdrive voltage is mistuned. If motion feels jittery or stuttering, check your frame rate stability with our fps tester.
Why the UFO Ghosting Test Uses Multiple Speeds
Testing UFOs at different speeds lets you compare motion blur and trailing side by side. A fast monitor keeps shapes clear even on high-speed rows, while a slower panel shows longer trails as speed increases. Because trailing also depends on your monitor Hz, check your panel speed with our refresh rate test.
Reading the Pixel-Response Flash Test
Flash Mode alternates the screen between black and white on a steady timer. If you notice a faint gray afterimage right after colors switch, your monitor pixels are lagging behind during rise and fall transitions. To make sure hardware delays are not slowing down your gaming inputs, check your system with our input lag tool.
Monitor Ghosting and Motion Blur: The Complete Guide
Motion blur and monitor ghosting are common issues when playing fast-paced games or scrolling through text. A screen might feel sluggish or leave blurry trails behind moving objects. While box labels often promise a “1ms response time,” real performance depends on your panel type, refresh rate, and monitor overdrive settings. This guide explains what causes these trails and how to use our ghosting test to make your screen look sharper.
1. What Is the Difference Between Motion Blur and Ghosting?
People often mix up motion blur and monitor ghosting, but they come from two different sources:
- Motion Blur: A smooth smear along the edges of moving objects. Even on a perfect screen, your eyes naturally blur static frames as they track motion across the display (known as sample-and-hold blur). Higher refresh rates reduce this blur by showing shorter, more frequent frames.
- Monitor Ghosting: A visible, faint trail or duplicate silhouette that drags behind moving graphics. Ghosting happens when the liquid crystals inside an LCD take too long to switch colors. Slower color changes leave older colors lingering on screen.
- Inverse Ghosting (Pixel Overshoot): A bright, glowing, or discolored halo trailing behind a moving object. This happens when monitor overdrive sends too much voltage, forcing pixels to overshoot their target color before snapping back.
2. How Display Panels Compare (IPS, VA, TN, and OLED)
The display panel technology inside your monitor plays the biggest role in how much ghosting and motion blur you see:
Fast IPS (In-Plane Switching)
Modern Fast IPS panels are very popular for gaming. They change pixel colors in about 3 to 5 milliseconds. They deliver wide viewing angles, vibrant colors, and consistent response times with very little dark-level smearing.
VA (Vertical Alignment)
VA panels provide deep contrast and dark blacks, making them popular for movies and dim rooms. However, their pixels switch slowly out of deep black shades. This causes dark objects to leave noticeable purple or black trails, known as dark smearing.
TN (Twisted Nematic)
TN panels were the classic choice for esports. Their pixels transition very quickly without heavy overdrive. Their viewing angles and contrast are limited, but they keep fast motion clean and sharp.
OLED & QD-OLED
OLED monitors do not use liquid crystals. Each pixel is its own tiny light that turns on and off in less than 0.1 milliseconds. This almost completely eliminates physical ghosting and dark smearing, though high refresh rates are still needed to minimize natural eye tracking blur.
3. How to Calibrate Monitor Overdrive and Fix Ghosting
Most gaming monitors have an Overdrive setting in their menu (sometimes labeled Response Time, Trace Free, or Ramp Time). Overdrive adds extra voltage to make pixels change colors faster:
- Overdrive Off or Low: Pixels transition slowly. Moving shapes leave soft, dark trails (standard ghosting).
- Overdrive Medium (Normal or Fast): Pixels reach their target color within the frame window. Trails disappear and edges look sharp. This setting is usually best for gaming.
- Overdrive Extreme (Highest Setting): Pixels receive too much voltage and overshoot their target color. This creates bright, glowing halos known as inverse ghosting.
Use the UFO ghosting test on this page while changing your monitor's overdrive setting in the on-screen menu. Stop when the dark trails fade away and before bright glowing halos appear.
4. Refresh Rates, MPRT, and Backlight Strobing
Understanding response time ratings helps you pick the right settings and hardware:
- GtG (Gray-to-Gray): How long it takes a pixel to switch between two shades of gray. Fast GtG stops trailing shadows and ghosting.
- MPRT (Moving Picture Response Time): How long each frame stays visible on your screen. Shorter persistence reduces perceived motion blur on sample-and-hold displays.
- Backlight Strobing (BFI, DyAc, ULMB, ELMB): High-end monitors can pulse the backlight between frames. Instead of leaving the light on continuously, the monitor blinks the light only after pixels finish changing. This delivers sharp, CRT-like motion clarity during fast camera turns. Note that strobing lowers peak screen brightness.
- Complete Setup Checks: Along with screen clarity, reflex speed and hardware accuracy matter in fast games. Test your visual reflex response with our visual reaction tool, and check your keyboard for missed key presses with our keyboard ghosting test.