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.
Related Screen Tools
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ScoreMulti-stage screen assessment covering geometry, color gamut, gradients, text clarity, and contrast.
Dead Pixel Test
DefectsIdentify dead (black), stuck (red/green/blue/white), and defective subpixels across full-screen solid fields.
Color Test
GamutVerify RGB/CMYK color reproduction, primary chromaticity, and wide color gamut (sRGB, DCI-P3, Rec.2020).
Contrast Test
StepsEvaluate black level depth, white saturation, shadow detail retention, and step gradients.
Backlight Bleed Test
LuxDetect edge backlight leakage, corner IPS glow, and clouding in light-controlled conditions.