Free hardware tester
Stuck Pixel Test and Small RGB Pixel Fixer
Runs locally in your browser. Nothing is uploaded.
Stuck pixel detector and fixer
Inspect solid colors first, then optionally flash only a small draggable region over a suspected stuck subpixel.
Last updated: July 29, 2026
Stuck pixel test: This stuck pixel test separates diagnosis from an optional small-region RGB fixer. Manual solid colors come first; rapid flashing is never presented as a guaranteed repair.
How this stuck pixel test works
Use red, green, blue, white, black, and grey to locate a point that stays lit in the wrong color. If it is a stuck subpixel, drag the small fixer region over it and run short sessions. Keep the rest of the screen static and stop if uncomfortable.
How to read the results
A stuck subpixel remains lit in one or more color channels and may change after cycling. A truly dead pixel remains dark because its transistor or subpixels do not respond. A browser cannot repair a dead pixel, pressure damage, or broad panel defect.
Common causes of failed tests
Stuck pixels can follow a transient subpixel state, manufacturing defect, controller issue, pressure, heat, or aging. Dust, reflections, and coating marks can imitate a defect, so compare the exact point on several colors.
Troubleshooting before you replace hardware
Photograph the point on multiple backgrounds, avoid pressing or rubbing the panel, and review the seller’s pixel policy. The RGB fixer may help some stuck subpixels but has no guaranteed duration or success rate. Replacement is the reliable remedy for dead hardware.
For setup and buying context, see the screen test hub, color screens, dead pixel test, stuck pixel test, monitor ghosting test, FPS test, and refresh rate test.
Frequently asked questions
Can the fixer repair a dead pixel?
No. A dead pixel does not respond, and browser flashing cannot repair failed hardware.
How long should the fixer run?
Try conservative 10 to 20 minute sessions, stop if uncomfortable, and recheck manually.
Should I press on the pixel?
No. Pressure can damage the panel and may affect warranty coverage.