Tool categories
Watch the moving box. Trail behind = ghosting. No trail = healthy panel.
Monitor Ghosting Test is a free, browser-based screen testing tool that lets you detect pixel response time issues with adjustable-speed moving box on multiple color backgrounds.
Monitor ghosting is when fast-moving objects on screen leave a trailing blur or color smear behind them. It's caused by slow pixel response time — the LCD/OLED cells can't change color fast enough between frames. Bad ghosting hurts gaming clarity, video editing precision, and fast scrolling readability.
Note: this is different from keyboard ghosting (missing keys during multi-press). Same word, completely different problem.
Do not assume the fastest response-time label is best. Use this test to compare Off, Normal, Fast, and Extreme, then keep the cleanest setting before inverse ghosting appears. For the full decision table, read the monitor ghosting and overdrive guide. And if you are wondering how pixel response holds up at the absolute limit, our analysis of the 1000Hz LG UltraGear 25G590B shows why a 1 ms transition on a 1 ms frame is the defining trade-off of extreme refresh rates.
If the moving object jumps forward instead of smearing behind itself, you may be seeing frame pacing or frame skipping rather than pixel response blur. Run the FPS test first to confirm your browser is actually holding a steady frame rate, then compare this result with the frame skipping test and the frame skipping diagnosis guide.
Monitor Ghosting Test FAQ
Check shadow detail with 32 near-black patches, detect crushed blacks
Check highlight detail with 32 near-white patches, detect clipped whites
11-step grayscale ladder to verify brightness, contrast, and gamma calibration
Checkerboard vs 50% gray squint test for contrast and gamma calibration
Compute pixels per inch, dot pitch, aspect ratio and megapixels for any display from resolution + diagonal
Type any two of width, height, or ratio. Auto-simplifies to lowest integer terms and renders a live preview
23 tools · 4 Web Stories
01 / 10
Monitor reality check
1000Hz Is Real. Worth $999?
LG's UltraGear 25G590B is the first native 1000Hz 1080p monitor. Check the fine print first.
01 / 10
Phone buying guide
PWM-sensitive? Test the phone, not the promise
Display specs narrow the shortlist, but no OLED is comfortable for everyone.
01 / 10
Screen flicker test
Your screen may be flickering
Many displays dim by switching the backlight on and off hundreds of times a second.
01 / 10
Monitor check
Dark scenes losing detail?
Your monitor may be turning several near-black shades into one flat black.
Source-based buyer analysis of the first native 1000Hz monitor: verified specs, the 1 ms GtG contradiction, the MBR Pro versus G-SYNC/FreeSync trade-off, dated prices against 480Hz OLED and dual-mode alternatives, and five delivery-day browser tests.
