Fullscreen Red Screen
Lighting & Brightness
Sleep / Focus Timer & Ambient Noise
Keyboard Shortcuts
1-Click Wallpaper Downloader
Download exact-fit lossless wallpaper of the current screen color:
Download Exact-Fit Solid Color Wallpapers
Generate lossless solid color wallpapers in Full HD, 2K, 4K, 8K, Ultrawide (21:9), and Mobile (9:16). Instant client-side download in PNG, JPG, or WebP.
Pick Wallpaper Color
Select Resolution & Format
Everything You Need to Know
Common questions about screen utilities, color temperature, dead pixels, and monitor care.
Why do astronomers and photographers use a red screen at night?
Red light has the lowest frequency in the visible light spectrum and does not degrade human scotopic (night) vision or suppress melatonin production. This makes a red screen ideal for night photography, stargazing, darkroom photo processing, and gentle night lights.
How do I check for defective red subpixels?
Launch the pure red screen in fullscreen. Any pixel that appears completely black indicates a dead red subpixel, while an off-color pixel indicates color cross-contamination.
Can I use a red screen to prevent melatonin suppression before bed?
Yes, red light emits no blue spectrum wavelengths, helping you read or relax in bed without signaling wakefulness to your brain.