Privacy & device tools
Dead Pixel & Screen Test Online
Look for pixels that appear different from their neighbours.
Data is processed on your device · No data is uploaded to our servers
In the focused panel, Left/Right arrows change patterns; H hides or shows controls. Escape exits fullscreen.
Instructions
- Select a colour or pattern.
- Enter fullscreen if desired.
- Change patterns manually; press Escape to exit fullscreen.
Understanding your result
A pixel that stays different across several solid colours is a useful observation to investigate. The page relies on your visual inspection, so it does not report a pass or fail. Static patterns help compare areas of the panel without automatically flashing colours.
What to do if you have a problem
If patterns look uneven, inspect browser zoom and display scaling. Try solid colours as well as fine lines. Enter fullscreen may be unavailable in your browser; the panel still works in the page. Escape exits fullscreen, and H in the focused panel toggles controls.
What to know before using the result
This is a manual visual inspection, not a diagnosis or repair. Browser zoom, display scaling and panel subpixel layout affect patterns. Fullscreen may be unavailable. Patterns are static and never flash automatically.
Files and text are held in this page while you work. Downloads are saved through your browser. Reloading or closing the tab clears the working page; a downloaded copy remains in your device's download location.
Summary
Use several static colours and patterns to inspect the display, then leave fullscreen when finished.