Test pixel response time with rapid black-white transitions. Detect ghosting and motion blur. Essential for gaming monitors. Free tool.
Measures how quickly pixels change state (ms). Slow response causes ghosting.
If you see ghosting, motion blur, or trailing shadows behind fast-moving objects in games or videos, your monitor's pixel response time may be too slow. This test rapidly flashes between black and white so you can observe how quickly your pixels transition.
✅ Clean, instant transitions — no trails — Your monitor has fast pixel response. Suitable for gaming and fast content. You should see sharp black and white flashes with no ghost images between them.
⚠️ Slight gray shadows during transitions — Your monitor has moderate response time. You may notice ghosting in fast games. Try adjusting your monitor's overdrive/response time setting (usually in the OSD menu).
❌ Visible smearing or bright halos between transitions — Your monitor has slow response (likely VA panel) or overdrive is set incorrectly. If you see bright "corona" artifacts, your overdrive is too aggressive — turn it down.
You should see sharp, instant flashes between pure black and pure white with no visible gray "in-between" frames. Each flash is crisp and distinct — like a strobe light. No trails, smears, or ghost images between transitions.
During transitions, you can see a brief gray or shadow frame — the previous state lingers for a moment before fully transitioning. This is most noticeable in the black-to-white direction and indicates moderate pixel response time (5-10ms).
Transitions show visible smearing — the screen appears to "swipe" between states rather than instantly switching. Alternatively, you may see bright white halos or corona around the edges during transitions, which indicates overdrive is set too high (inverse ghosting).
A faint trail following moving objects caused by slow pixel transitions.
5ms for general use, 1-4ms for gaming, 0.1ms for OLED.
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