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HTML5 Monitor / Display Tester
Monitor / Display Tester
Dead/stuck pixel screens, gradients & banding, gamma/contrast, sharpness, and motion/refresh visuals.
Ready
Test Pattern
Mode
Solid color
Tip: Stuck pixels show on some colors but not others. Scan slowly.
Motion speed
1.00×
This draws a moving bar + scrolling pattern so you can spot ghosting, stutter, tearing (if VSync/G-Sync mismatch),
and frame pacing issues.
Tools
Fullscreen is best for pixel tests. Hotkeys in fullscreen:
Esc exit,
Space next solid color (in solid mode),
H toggle crosshair,
Z toggle zoom.
Info
Canvas size —
DPR —
Mode —
FPS (motion mode) —
Preview
For best results, disable “Night Light / f.lux”, HDR tone mapping, and any “enhancement” modes while testing.
Fullscreen •
Esc exit • Space next solid color • H crosshair • Z zoom
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