Why test a display with pure red?
Red makes the red sub-pixel channel visible on its own. A dark spot or a pixel with the wrong color can be easier to see than on mixed content.
Solid color screen
Red Screen
Open a pure red screen online to inspect red sub-pixels, preserve night vision or make a vivid light and background. Download a red AVIF image for your display.
Red Screen for testing and lighting
A pure red screen isolates the red channel so uneven or stuck red sub-pixels are easier to identify. Red light is also useful in dark rooms because it can preserve night vision better than a bright white display, while the solid field makes a clean background for video and design work.
- Find dark or uneven red sub-pixels during a stuck-pixel check.
- Use red light to preserve night vision during dark-room work.
- Create a solid red background for video, compositing or design work.
Fullscreen tips
Open fullscreen before inspecting the display. Lower room light and clean the panel first so dust, tint and pixel defects are easier to see.
Follow the complete dead pixel test guideHow to use Red Screen online
- 1
Open the red screen fullscreen
Fill the display with pure red, then inspect the center, edges and corners for darker pixels, incorrect color or uneven red brightness.
- 2
Use red as a low-distraction light
Lower brightness for reading, astronomy or dark-room work. Red light can keep more of your night vision than a white screen.
- 3
Download a red AVIF background
Choose the closest resolution for a solid red video background, projection test, social clip or compositing reference.
Common questions about Red Screen
Can a red screen help with night vision?
A dim red screen is commonly used for low-light tasks because it can be less disruptive to dark adaptation than bright white or blue light.
More screen tools
Free browser-based utilities for testing, lighting and creating screen backgrounds.
Color Screen
Open any solid color full screen or download it as an image.
Screen Light
Turn your display into an adjustable warm or cool light source.
Gradient Generator
Build, preview and export smooth two-color backgrounds.
Screen Information
Inspect resolution, pixel density, viewport and display capabilities.