Red Screen
Fullscreen vibrant red screen (#FF0000). Preserve night vision, create darkroom mood lighting, or test your display for dead or stuck red subpixels.
Pure 100% Fullscreen
Screen Wake Lock keeps display awake. Cursor hides automatically after 2.5s of idle time while fullscreen.
Key Highlights
What People Use Red Screen For
Night Vision Preservation
Red light does not disrupt rhodopsin in human eyes, making it ideal for astronomy and night work.
Subpixel Testing
Confirm every individual red subpixel across your 1080p, 1440p, or 4K panel is functioning.
Creative Photography
Cast a dramatic crimson edge light on subjects without needing physical gel filters.
Red Screen FAQs
Why is red light used at night?
Red wavelengths do not reset night vision adaptations in human retinas, preserving your eye sensitivity in the dark.
How do I enter fullscreen?
Click the "Open Fullscreen" button or press "F". Exit by pressing "Esc".
Related Screens
Green Screen
Fullscreen pure chroma green (#00FF00). Great for chroma key backdrops, video keying tests, and inspecting display green subpixels.
Blue Screen
Clean solid deep blue screen (#0000FF). Test blue OLED degradation, create cool atmospheric lighting, or test blue subpixel health.
Dead Pixel Test
Free fullscreen dead pixel test tool. Cycles pure solid test colours (White, Black, Red, Green, Blue, Cyan, Magenta, Yellow) on click or auto-timer.
White Screen
Instant fullscreen pure white screen (#FFFFFF). Zero ads or popups. Perfect for monitor cleaning, dead pixel detection, reading light, and video illumination.