Use more than one color
White can reveal dust and broad tint changes; black can make bright points and edge glow more visible. RGB fields isolate color channels, while gray helps compare tone across the panel.
privacy-first display utility
White screen test for pixels, dust and display checks.
Fill your screen with pure white, black, RGB colors, gray, warm white or a custom HEX color. Use the grid to make small marks easier to locate.
- No signup
- Browser-based controls
- Exit with Esc
- No advertising runtime
screen control
Start a fullscreen test
#FFFFFFCurrent screen color
Use a HEX color like #FFFFFF. Fullscreen depends on your browser permission.
Ready. Choose a preset or start the white screen.
Safe fullscreen behavior
The tool asks the browser to fullscreen a color layer. If permission is declined, the layer still fills the browser viewport. Press Esc, click Exit, or tap the open field to close it.
Observe, do not diagnose
A solid field helps you notice and reproduce an observation. Dust, reflections, scaling, viewing angle and panel technology can look like defects, so this browser tool does not diagnose hardware.
Run a quick display check
- Clean the powered-off panel with a suitable cloth, then return it to normal brightness.
- Check white and black from your usual viewing position.
- Inspect red, green, blue and gray without changing zoom or scaling midway.
- Repeat suspicious observations from another angle, then use the grid to locate the spot.
For a detailed workflow, interpretation limits and worked observations, read how the White Screen Test works.