Brightness 100%
Timer Mode

Set a timer for fullscreen display. Useful for timed screen tests and ambient lighting sessions.

红色 background

px
×
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#FF0000
Custom Color
Opens one color window per detected screen. Drag & fullscreen each.
Free & Browser-Based

Free Online Screen Savers – No Download Required

Transform your display with beautiful, interactive screensavers that run right in your browser. Choose from digital clocks, productivity timers, ambient animations, and mesmerizing visual effects — perfect for idle screens, desk displays, presentations, and relaxation.

Free Prank Tool

Fake Update Screens – Free Online Prank Tools

Realistic fullscreen prank screens — BSOD, Windows updates, Ubuntu upgrades, iOS updates, and hacker terminals. Launch any screen fullscreen and watch your friends panic. Press ESC to exit anytime.

Screen Testing Tools

Auto Color Cycle

Rapidly cycle through colors to help fix stuck pixels. Run for 20–30 minutes for best results.

OLED Burn-in Test

Display a moving pattern to detect and reduce OLED burn-in artifacts on your screen.

Gradient Smoothness Test

Display smooth gradients to check for color banding and bit-depth issues on your monitor.

Checkerboard Pattern Test

Display pixel-level checkerboard patterns to test monitor sharpness and pixel response.

Pixel Response Time Test

Flash rapid black/white transitions to evaluate pixel response time and ghosting.

Viewing Angle Test

Display color bands to help evaluate your monitor's viewing angle consistency.

Gray Uniformity Test

Display 50% gray to reveal backlight hotspots, clouding, and brightness non-uniformity.

Color Accuracy Checker

Display reference color swatches to compare against known standards for calibration checks.

Multi-Monitor Detection

Detect connected displays and open fullscreen color on all screens simultaneously.

Drag each window to a different monitor, then click Go Fullscreen inside it.
Detected Screens
Click "Refresh" to detect…

About 红色

<p>红色屏幕工具将显示器填充为纯红色。红色是对人眼夜视影响最小的颜色之一。因此在夜间工作、天文观测和军事应用中被优先使用。</p><p>在子像素测试中红色背景起着关键作用。每个像素由红、绿、蓝子像素组成。在全红色屏幕上可以轻松检测到故障的红色子像素。</p><p>摄影师和电影制作人可以将红色屏幕用于创意照明效果。用显示器作为红色光源拍摄戏剧性人像、恐怖场景或艺术项目。</p><p>红光对褪黑素产生的抑制也较少。如果您在夜间入睡前必须使用屏幕,红色背景对眼睛的伤害更小,有助于保持睡眠节律。</p>

Frequently Asked Questions – 红色

眼睛负责夜视的视杆细胞对红光最不敏感。因此红光不会破坏暗适应。

可以,您可以在摄影暗房中将显示器用作红色安全灯。但请根据胶片灵敏度使用合适的红色调。

相比蓝光和白光,红光对褪黑素产生的影响要小得多。它是夜间使用最合适的屏幕颜色。

在全红背景上寻找暗点或不同颜色的像素。这些表明红色子像素存在故障。

当然可以。红光创造温暖而戏剧性的氛围。非常适合电影之夜、浪漫晚餐或主题活动。