Screen Test Online — Colors & Dead Pixel Check

Screen & color test

Choose a color, then open full screen. Tap the color to show or hide the controls. Selecting another color hides them again. Use Back or Escape to leave. Some browsers keep their own bars visible.

Choose a color or gradient

What did you observe?

Run the test before recording an observation. You can skip an unavailable test.

Next test →Review checklist

Your observations stay in this browser tab. You can clear them below.

How to use this tool

Clean the screen gently and view it at a comfortable brightness. Turn off color filters or night mode if you want to compare basic colors.
Select a color and open full screen. The color fills the view without controls. Tap to reveal Previous, Next and Exit; choosing another color hides the controls again. Keyboard arrows also change colors.
Inspect the whole display, including edges. Exit full screen before recording your own observation.

Understanding your results

A dot that stays dark on several bright colors may need checking; a bright dot on black may also deserve attention. Dust, reflections and display processing can look similar. This visual test does not automatically detect or fix dead pixels.

How to use a dead pixel test

A solid background removes distracting images so that you can look for dots or marks that remain in the same physical location. Compare several colors instead of drawing a conclusion from one view. Clean the surface and change your viewing angle to rule out dust or glare. If a mark remains visible in other apps too, document it and consult the seller or manufacturer.

Check colors and uneven areas

The gray screen and gradient can make bands or uneven brightness easier to see. Room lighting, viewing angle, automatic brightness and night-mode settings affect the appearance. An OLED display may turn black pixels off, so a completely black view does not mean the screen has stopped working. This tool is not a calibrated color-accuracy measurement.

Full screen, without flashing

Colors change only when you choose them; there are no flashing patterns. Tap the color to show or hide controls, and use Back or Escape to leave. Native fullscreen is requested where supported; otherwise the test fills the browser viewport. Browser bars, system gestures and physical cutouts may still limit access to an edge. This is a visual inspection, not a pixel repair.

Questions, answered

Does this screen test repair dead pixels?

No. It displays backgrounds for visual inspection. It does not repair a panel or confirm whether a pixel is dead or stuck.

Can I test a laptop or monitor?

Yes. Open this page on the display you want to inspect. The same color views work on phones, tablets and computers.

Why do the colors look different on another phone?

Display technology, brightness, color profiles and ambient light differ. Comparing uncalibrated screens is not a measurement of color accuracy.