Visual display inspection utility
Stuck Pixel Checker
Show exact solid screen colors to visually inspect a display for pixels that do not change as expected.
All input and results stay in this browser tab. This page uses no account, upload, remote calculation, URL state, analytics event, or persistent storage.
Choose a test color
Choose a color directly, or start the full-window test and use Previous/Next or the Left/Right arrow keys.
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Method
Displays nine exact sRGB CSS colors for visual inspection. Fullscreen is requested only after the user starts the test; a full-window in-page fallback remains available when fullscreen is unsupported or denied.
Worked example
Select black to look for pixels that remain lit, then white, red, green, and blue to look for pixels that fail to show one or more components.
Limitations
Visual inspection cannot conclusively diagnose hardware. This checker does not repair pixels, calibrate a monitor, capture the screen, or run flashing or rapidly cycling sequences.
Related tool
Color Contrast Checker serves a different user job.