Screen Test
Test your monitor with full-screen colors, gradients and patterns to spot defects.
Pick a color or pattern to fill the whole screen. Click, press space or → to move through the colors, and Esc to exit.
Solid colors
Test patterns
Continue your work
- Dead Pixel Test — Find and fix stuck pixels.
- What Is My Screen Resolution — See your screen resolution.
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Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the Screen Test
Test your monitor with full-screen colors, gradients and patterns to spot defects.
- 1 Click a color or test pattern to fill the screen.
- 2 Click or press → to move through the colors; press Esc to exit.
- 3 Look for dead pixels, uneven backlight, color tints and banding.
Example and practical tips
Check a new laptop within its return period: black shows backlight bleed at the edges, and the gray gradient reveals banding.
Frequently asked questions
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.
Report an issue
Something broken or not quite right? Tell us and we will look into it.