How to use the red screen
- Press “Fullscreen” or the F key.
- Use ↑ ↓ to adjust brightness and ← → to switch color.
- Exit with Esc or a double click.
What it's useful for
- A pure red field only lights the red subpixels, so a missing or stuck red subpixel shows up as a dark or odd dot.
- Cleaning your display: dust and fingerprints are easier to see on a solid color.
- A quick visual check for dead or stuck pixels.
- A simple light or background for photos, video and ambience.
Compatibility
Works in modern browsers on Windows, macOS, Linux, Android and iOS. Some phones, especially iPhone, limit true fullscreen in the browser; the color still covers the page.
Frequently asked questions
How do I get a full red screen?
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Click “Fullscreen” or press F. Your browser hides its bars and the color fills the display.
Can I make it dimmer?
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Yes, use the brightness slider or the ↑ ↓ keys while in fullscreen.
Can I download it as a wallpaper?
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Yes, as PNG or JPG from HD to 8K, generated in your browser.