Check your monitor for dead pixels, color banding, backlight bleed, and refresh rate
Resolution
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Browser viewport
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Pixel ratio
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Color depth
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Refresh rate
measuring…
Fullscreen display test
Runs a series of fullscreen patterns to check for dead pixels, backlight bleed, color banding, and sharpness. Best viewed in a dark room.
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Dead & stuck pixels
Cycle the solid colors fullscreen and look closely for dots that stay black (dead) or stuck on one color.
Backlight bleed
On the black screen in a dark room, look for bright patches or glow along the edges.
Color banding
On the gradient, a smooth fade means good color depth; visible stripes indicate banding.
Refresh rate
We measure how many frames per second your screen draws — higher means smoother motion. On multi-monitor setups your browser may report your primary/highest-Hz display rather than the screen the window is on.