By ToolzHive
About this tool
Test your monitor with full-screen colors, gradients and patterns to spot defects.
How to use Screen Test
- Click a color or test pattern to fill the screen.
- Click or press → to move through the colors; press Esc to exit.
- Look for dead pixels, uneven backlight, color tints and banding.
Worked example
Check a new laptop within its return period: black shows backlight bleed at the edges, and the gray gradient reveals banding.
What is backlight bleed?
Light leaking around the edges of an LCD panel, easiest to see on a black screen in a dark room.
What does the gradient test show?
Visible steps instead of a smooth fade mean the screen shows fewer shades, called banding.
Put this guide into practice
- Screen Test — Test your monitor with full-screen colors, gradients and patterns to spot defects.