Yellow Screen.
Open a yellow screen in full screen, explore shades, or download a solid yellow background.
Choose your color
Click to previewScreen settings Dimming & keep awake
This changes the displayed color. Adjust your device brightness for a brighter or dimmer screen.
Works only while this page is visible. Your system may still interrupt it.
Download a plain background
#FFFFFFA clean, solid image. No border, watermark or dimming.
Key takeaways
- Yellow #FFFF00 is red and green at full strength, with blue off.
- It is the brightest colour here after white: about 93 % of white's luminance.
- On yellow, a stuck blue subpixel looks like a white point.
Pick a color
Start with yellow, choose a preset or enter your own HEX code.
Make it full screen
Open the color across your screen. Press Escape or tap Exit to return.
Take it with you
Download a plain PNG or JPG in the size that fits your project.
Bring a little yellow to your screen.
Yellow #FFFF00 combines full red and green values with no blue. Use it for a bright presentation background or compare how a solid yellow field looks across displays. Appearance varies with display settings.
How does a screen make yellow?
By mixing light. A screen has no yellow subpixels; it lights red and green fully and leaves blue off, and the eye sees the mix as yellow. That makes yellow a useful extra check, because it shows two subpixels at once.
| You see on yellow | Possible reason |
|---|---|
| White-looking point | Blue subpixel stuck on |
| Green point | Red subpixel not lighting |
| Red point | Green subpixel not lighting |
Find your color.
Questions, answered.
Why does the yellow screen look almost as bright as white?
Red and green together give about 93 % of the luminance of white in the sRGB weighting; blue adds only the last 7 %.
Is this the same as warm white?
No. Pure yellow is #FFFF00. For a softer, near-white light, choose Warm or Extra Warm in Screen Light.
How do I leave full screen?
Press Escape or move your mouse or touch the screen to reveal Exit. Press F to toggle full screen when you are not typing in a field.
Does it work on phones and tablets?
Yes. If your browser cannot open true full screen, the color fills the browser window instead. Browser bars may remain visible. You can use portrait or landscape orientation.
Can this change my device brightness?
No. Screen dimming darkens the displayed color only. Use your device’s brightness controls to adjust the physical display.
What does Keep screen awake do?
When supported and allowed, it asks your browser to keep the display on while this page is visible. The status shows whether the request is active, released or unavailable. Battery settings and system behavior may override it.
Can I download a 4K background?
Yes. Choose 4K UHD for a 3840 × 2160 image. Images are created on your device and contain the selected base color only, without the dimming effect.
Sources: W3C, CSS Color Module Level 4, named colors; W3C, WCAG 2 definition of relative luminance. Last reviewed November 12, 2026.