Blue Screen Test Tool

Use this blue screen to find dead blue subpixels, stuck pixels and color tint problems, or as a cool background light.

White Screen

Why use a White Screen?

    This blue screen tool shows a full-screen solid blue (#0000FF). With only the blue part of each pixel lit, it is the easiest way to check blue subpixels, find stuck pixels and see whether your display has an uneven or yellowish tint. Looking for the Windows “blue screen of death” error instead? See the note at the end of this page.

    How to Test Your Screen with Blue

    1. Turn off night light, Night Shift, blue light filters and eye comfort modes. These reduce blue and will make the test look wrong.
    2. Open the blue screen in full-screen mode at high brightness.
    3. Look for black dots (dead blue subpixels) and red, green or white dots (stuck pixels).
    4. Check that the blue looks the same in all corners. Darker or purple-looking areas point to uneven color.

    What a Blue Screen Shows

    • Dead blue subpixels: black dots that are not visible on red or green.
    • Stuck pixels: bright dots of another color.
    • Color tint and uniformity: blue makes a yellow or green cast easy to notice, especially on older LCD panels whose backlight has aged.
    • Blue light filter problems: if blue looks dark or navy even with filters off, check your display color settings.

    Other Uses for a Blue Screen

    Chroma-Key Background

    Like green, blue can be keyed out in video editors. Blue works better when your object has green parts. Place small objects in front of a display showing blue and apply a chroma key effect.

    Cool Ambient Light

    A blue screen gives a cool, calm light for photos, videos or a gaming setup.

    Daytime Alertness

    Bright blue-rich light can make you feel more alert, which is also why it is best to avoid bright blue screens late in the evening, when it can make it harder to fall asleep.

    Blue Screen of Death (BSOD) Is Something Different

    A Windows “blue screen of death” is an error screen shown when Windows crashes, usually with a stop code such as CRITICAL_PROCESS_DIED. It is not caused by your display. This tool only shows a solid blue color and cannot trigger or fix that error. If you see a BSOD, note the stop code and check Microsoft support for that code.

    Frequently Asked Questions

    Why does my blue screen look purple?

    Your display may be adding red because of color settings, a warm color temperature or a cable problem. Reset picture settings and try another cable. Our purple tint guide explains more.

    Is a blue screen bad for my eyes?

    Looking at a blue screen for a short test is fine. Avoid bright blue screens for long periods at night if you want to sleep well.

    Which color should I test next?

    Run the white screen for dead pixels and the black screen for bright stuck pixels and light leaks.