What does a monitor test check for?

Cycling solid colors reveals several common display faults at once: dead and stuck pixels, backlight bleed and clouding (on black), brightness uniformity (on white and grey), and color channel accuracy (on red, green, and blue).

How do I check for backlight bleed?

Run the test in a dark room and switch to the black screen. Look for patches or edges where light leaks through. Some bleed is normal on LCD/LED panels; large bright clouds may indicate a defective unit.

How do I check screen uniformity?

Use the white and grey fields and look for areas that appear darker, brighter, or tinted compared to the rest of the panel. Uneven brightness or color casts point to backlight or panel uniformity problems.

Is this monitor test free?

Yes. GetWhiteScreen is completely free, requires no registration or downloads, and works in any modern browser on desktop and mobile.

What does a monitor test check for?

Cycling solid colors reveals several common display faults at once: dead and stuck pixels, backlight bleed and clouding (on black), brightness uniformity (on white and grey), and color channel accuracy (on red, green, and blue).

How do I check for backlight bleed?

Run the test in a dark room and switch to the black screen. Look for patches or edges where light leaks through. Some bleed is normal on LCD/LED panels; large bright clouds may indicate a defective unit.

How do I check screen uniformity?

Use the white and grey fields and look for areas that appear darker, brighter, or tinted compared to the rest of the panel. Uneven brightness or color casts point to backlight or panel uniformity problems.

Is this monitor test free?

Yes. GetWhiteScreen is completely free, requires no registration or downloads, and works in any modern browser on desktop and mobile.

Monitor Test

Test any monitor, laptop, or TV in seconds. Cycle through solid white, black, grey, red, green, and blue fields to check for dead pixels, backlight bleed, uneven brightness, and color accuracy.

Click or press Space to change field • ESC to exit

What this monitor test checks

Dead & stuck pixels

White and the primary colors expose pixels that stay dark or locked on a single color.

Backlight bleed

A full black field in a dark room reveals light leaking from the edges of LCD/LED panels.

Brightness uniformity

White and grey fields make darker patches, bright spots, and clouding easy to see.

Color accuracy

Pure red, green, and blue fields help you judge whether each channel renders cleanly.

Monitor test FAQ

Related tools: Dead pixel test · White screen · Black screen · All colors