Màn hình đỏ

Độ sáng 100%
Chế độ hẹn giờ

Đặt hẹn giờ hiển thị toàn màn hình.

Màn hình đỏ nền

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Màu tùy chỉnh
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.

Fullscreen screensavers • Animated backgrounds • No installation • Works on Windows, Mac, Linux, Chromebook & mobile

Digital Clock Screensaver - Free Online Screensaver Preview

Digital Clock Screensaver

Beautiful digital clock screensaver with 10 color themes, 4 fonts, glow effects, and Wake Lock API. Runs fullscreen in y

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Pomodoro Timer - Free Online Screensaver Preview

Pomodoro Timer

Free Pomodoro timer with customizable durations, sound alerts, progress ring animation, and session tracking. Boost your

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Matrix Rain Screensaver - Free Online Screensaver Preview

Matrix Rain Screensaver

Classic Matrix-style green falling code screensaver with customizable speed, density, colors, and character sets (Kataka

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Rain on Window Screensaver - Free Online Screensaver Preview

Rain on Window Screensaver

Relaxing rain on window screensaver with realistic raindrops, lightning flashes, thunder sound, and fog effect. Perfect

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Starfield / Space Travel - Free Online Screensaver Preview

Starfield / Space Travel

Hypnotic 3D starfield screensaver with warp speed control, nebula colors, and shooting stars. Travel through space in yo

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Custom Text Screensaver - Free Online Screensaver Preview

Custom Text Screensaver

Display custom text fullscreen with animations. Choose bounce, scroll, fade, or float effects. Customizable font size, c

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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.

Fake update screens • BSOD prank • Windows update prank • Hacker screen • Ubuntu update • iOS update • Fullscreen prank tools

Windows BSOD Screen

Generate a realistic Windows Blue Screen of Death (BSOD) with authentic error codes, QR code, and CRITICAL_PROCESS_DIED

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Windows 10 Update Screen

Simulate a realistic Windows 10 update screen with customizable timing, non-linear progress, and authentic blue interfac

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Windows 11 Update Screen

Simulate a realistic Windows 11 update with circular progress ring, dark interface, and Windows logo. Free fullscreen pr

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Ubuntu Update Screen

Simulate a realistic Ubuntu Linux system upgrade with terminal output, real package names, and progress tracking. Free f

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iOS Update Screen

Simulate a realistic iOS software update with Apple logo, circular progress bar, and phase-based status messages. Free f

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Hacked Terminal Screen

Display a dramatic hacker terminal with auto-typing exploit commands, Matrix rain background, and CRT scanline effects.

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Công cụ kiểm tra màn hình

Chu kỳ màu tự động

Xoay vòng màu nhanh để sửa pixel bị kẹt. Chạy 20-30 phút.

Kiểm tra cháy OLED

Hiển thị mẫu di chuyển để phát hiện cháy OLED.

Kiểm tra gradient

Gradient mượt để kiểm tra dải màu và độ sâu bit.

Kiểm tra bàn cờ

Mẫu bàn cờ để kiểm tra độ nét và phản hồi pixel.

Kiểm tra thời gian phản hồi pixel

Chuyển đổi đen/trắng nhanh để đánh giá hiện tượng bóng ma.

Kiểm tra góc nhìn

Dải màu để đánh giá tính nhất quán của góc nhìn.

Kiểm tra độ đồng đều xám

Xám 50% để phát hiện điểm nóng đèn nền.

Kiểm tra độ chính xác màu

Màu tham chiếu để xác minh hiệu chuẩn.

Phát hiện đa màn hình

Phát hiện màn hình kết nối và mở màu toàn màn hình trên tất cả.

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

Giới thiệu Màn hình đỏ

A red screen isolates the red sub-pixel channel of your display, making it invaluable for thorough pixel testing. Each pixel on your monitor is composed of red, green, and blue sub-pixels. By displaying pure red, you can identify sub-pixel defects that might be invisible on a white or multi-color screen.\n\nRed screens are also popular for ambient lighting. The warm, low-wavelength red light is less disruptive to night vision and circadian rhythms compared to blue or white light. Astronomers use red screens on tablets to preserve dark adaptation while checking star charts, and photographers use them in darkrooms.\n\nFor gaming setups and content creation, a red screen provides dramatic background lighting for streaming and video production. It creates a bold, energetic atmosphere without the harshness of white light.\n\nRed light therapy enthusiasts also use full-screen red displays as a supplementary light source, though dedicated devices are more effective for therapeutic purposes.

Câu hỏi thường gặp – Màn hình đỏ

A red screen isolates the red sub-pixel in each pixel. If a sub-pixel is dead, it will appear dark against the red background. This catches defects invisible on white screens.

Red light has a longer wavelength and is less likely to suppress melatonin production compared to blue light. Using a red screen at night is less disruptive to your sleep cycle.

Yes. Red screens are used in darkroom photography to provide safe light that won't expose light-sensitive paper. Digital photographers use them as colored fill lights.

Try the Auto Color Cycle feature on this page. Rapidly cycling through colors can sometimes unstick a stuck pixel by stimulating the transistor. Run it for 20-30 minutes.

Công cụ liên quan

Full Screen Color Tool

Display any color fullscreen for testing and ambient lighting.

Video Compressor

Compress videos up to 90% without quality loss. Browser-based.

MP3 Extractor

Extract audio from any video file instantly.

Video Cropper

Crop and resize videos for any social media platform.