Free hardware tester
Black Screen: Fullscreen Blank Display
Runs locally in your browser. Nothing is uploaded.
Black screen
Choose a solid color, then open it full screen. Press Escape to leave full screen.
The page does not change monitor brightness. Use a comfortable hardware brightness setting, especially in a dark room.
Last updated: July 29, 2026
Black screen: This page provides a dark display for screen cleaning, checking glow or backlight bleed, reducing room light, and photographing reflective objects. Everything runs locally in the browser.
How this black screen works
Select black or another solid color, then choose Open full screen. Press Escape or use the on-screen exit control when finished. Wipe a display only with the power off and the manufacturer’s approved method.
How to read the results
A solid screen makes dust, smears, glow, discoloration, and uneven lighting easier to see. It is a viewing aid, not a calibrated measurement. Reflections, brightness, viewing angle, panel coating, and room light change what you see.
Common causes of failed tests
Uneven areas can come from fingerprints, dust, pressure damage, backlight bleed, panel uniformity, stuck pixels, image retention, or reflections. A solid screen cannot identify the cause by itself.
Troubleshooting before you replace hardware
Try several colors, reduce reflections, and compare at a normal viewing angle. For individual pixel checks, use the dedicated dead pixel test. If fullscreen is blocked, click the page and try again.
For setup and buying context, see the dead pixel test, white screen, and black screen.
Frequently asked questions
What is a black screen used for?
It provides a dark display for screen cleaning, checking glow or backlight bleed, reducing room light, and photographing reflective objects.
Does this test monitor brightness?
No. It displays a solid browser color and does not measure or change the monitor’s hardware brightness.
How do I leave full screen?
Press Escape or use the visible exit button.