A solid color is useful when you want the display to have no other on-screen detail competing for attention. Before you start, decide whether you need a quick visual check, a hands-free surface for wiping, or a red field to use as a background; the page supports each of these simple tasks.
How to use Red Screen
- Open Red Screen to show the default #FF0000 field. Select Fullscreen for a full-screen view, then select Exit fullscreen when you are finished.
- To look for a red subpixel that appears dark or different, inspect the field across the display. Check more than one area and view it straight on.
- Before wiping a touchscreen, select Cleaning mode. Touches are ignored while it is active; press and hold for 2 seconds to exit.
- For another solid shade, select an option under Quick colors, or choose Choose a custom color. Use Color picker, HEX, RGB, HSL, Hue, Saturation, and Lightness to set a color. Select Reset to return to red, Copy HEX to copy the color value, or Share color to share it.
- For screen lighting, adjust Display brightness and Warmth. Ring light frame and Frame width let you change the frame, and Sleep timer offers Off, 5 min, 15 min, 30 min, or 60 min.
- To save a red field as an image, go to Download a solid-color image. Choose PNG, JPEG, or WEBP, then select a preset under Resolution or choose Custom dimensions. For a custom size, enter Width (px) and Height (px), then select Download image.
When to use it
- Checking a new screen: Look for a red subpixel that appears dark or unlike the surrounding field before a return period ends.
- Inspecting a display you already own: Scan a phone, laptop, or monitor for visible differences across its red field.
- Cleaning a touchscreen: Cleaning mode helps prevent a wipe from triggering touches that change the page.
- Using a red screen light: Set the display brightness and warmth to suit the appearance you want from the screen.
- Making a simple photo or video background: Keep the red field on screen behind a subject or download it for another setup.
- Keeping a low-detail view while focusing: Use a plain red field when you want less visual detail on the display.
- Comparing basic colors: Choose another option under Quick colors to compare the red field with a different solid shade.
Tips for using a red screen
For a red subpixel check, look over the whole display rather than focusing on one spot. A uniform field can make an unusual-looking area easier to notice, but the observation is visual; it does not explain what caused the difference.
Display brightness and Warmth change how the field looks on screen. They do not change the HEX value or the downloaded image, so use the displayed color controls for viewing and the HEX value when you need to identify the selected color.
Choose an image resolution that fits where you plan to use it. Custom dimensions must be 16–8192 pixels per side and no more than 33,177,600 pixels total. An 8K image needs substantial memory and may fail on some devices; images stay in your browser.
If you want a broader visual inspection, try the Dead Pixel Test or Monitor Test.
Limits of Red Screen
Red Screen displays a color and provides image downloads; it does not measure or diagnose display hardware. A red field may help you notice a subpixel that looks unusual, but it cannot confirm the cause or tell you whether a display needs repair.
The color can look different on different displays or with different screen settings. If an unusual area remains noticeable when you compare it with other colors or patterns, contact the device or display manufacturer for help with a suspected hardware issue.