Screen Test — Check Your Display Online
Quickly check your computer monitor, laptop, or mobile screen for defective pixels, backlight leakage, and color balance.
Simple 3-Step Display Inspection
- Click Fullscreen to fill your entire display with test fields.
- Press the Right Arrow (→) or spacebar to cycle through White, Black, Red, Green, Blue, and Gray.
- Carefully inspect all four quadrants and borders for abnormal spots or discoloration.
Frequently Asked Questions
What is the fastest way to test a new screen or monitor?
Enter Fullscreen mode on this page and cycle through the primary solid colors (White, Black, Red, Green, Blue) to inspect for dead pixels, edge backlight bleed, and color uniformity.
Does this screen test work on laptops, tablets, and phones?
Yes. The test is 100% client-side HTML5 Canvas and responsive across mobile touchscreens, tablets, and desktop displays.
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Dead Pixel Test
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Backlight Bleed Test
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