Yellow Screen

A yellow screen is a free online tool that fills your display with pure yellow. On a screen, yellow is made from red and green light only, with the blue channel completely off, which makes it a naturally warm light for evening reading, cozy video calls and outdoor use where white light attracts insects. Click anywhere or press F for fullscreen and Esc to exit.

How to Use This Yellow Screen

1. Open this page on a phone, tablet, laptop or TV browser.
2. Click anywhere or press F for fullscreen. The display turns solid yellow with nothing on top.
3. Adjust your brightness to set the mood, from a soft glow to a bright warm lamp. Press Esc to exit, or download a yellow background from 480p up to 8K.

The Interesting Part: Yellow on a Screen Contains No Blue

Here is a fact most people never think about. Your display has only red, green and blue subpixels. When it shows pure yellow, the blue subpixels are switched off entirely. Pure Yellow means red at 255, green at 255, blue at zero.

Why that matters: the wavelengths your body clock responds to most, the blues around 460 to 480 nm, simply are not being produced by the pixels. A yellow screen gives you a bright, usable light with the most sleep relevant part of the spectrum removed at the source, not filtered afterward.

One honest nuance, in the same spirit as the rest of this site: on an LCD, the panel makes colors by filtering a white backlight, and those filters leak a small amount of other light. On an OLED, the blue subpixels are genuinely off, so the no blue claim is close to literal. Either way, a yellow screen at the same brightness emits far less blue than a white one.

Yellow Screen as a Warm Reading Light

This is an everyday use. Open the yellow screen on a spare phone or tablet, prop it beside your book, and you have a warm reading lamp that costs nothing:

• Bedside reading without the cold glare of a white screen or overhead light.
• Reading to kids at night with a light that feels like a lamp, not an office.
• Power cuts: a tablet showing fullscreen yellow at medium brightness runs for hours and lights a page comfortably.

Compared to night mode filters that tint your whole interface, this is simpler: one page, one color, full brightness control, and you close the tab when done. For an even warmer, dimmer wind down light later in the evening, our orange screen takes over from here.

Warm Lighting for Video Calls and Selfies

Pure white screen light can read cold and clinical on skin. Yellow light flatters:

• Open this page in a window beside your camera during calls, or on a second monitor, and your face picks up a warm cast that reads as friendly and relaxed.
• Mix it with white: many streamers light one side of the face with the white screen and the other with yellow. The two screen setup gives a key light and a warm fill from hardware you already own.
• Selfies in dim rooms: a phone showing yellow at full brightness held slightly above eye level gives a softer result than the harsh white of a flash.

If you want warmth with a golden, glamorous edge for photography rather than calls, that lives on the golden screen page. 

Yellow Light Outdoors: The Bug Light Trick

Yellow "bug bulbs" exist for a real reason. Most flying insects navigate and hunt by short wavelengths: ultraviolet, blue and green light are what their eyes detect best, and longer wavelengths like yellow barely register to them.

A screen showing this page uses the same principle:

• On a campsite table or porch, a tablet on fullscreen yellow gives usable light that attracts noticeably fewer insects than a white screen or lantern.
• Eating or playing cards outside at night, yellow light keeps the swarm around someone else's white lamp instead of your table.

Honest framing, because this gets oversold elsewhere: yellow light is less attractive to insects, not a repellent. Bugs already near you will not leave, but you stop broadcasting the come here signal that white and blue light send.

Why Your Eyes Cannot Tell Screen Yellow From Real Yellow

A small piece of science that explains how every display works. Real spectral yellow is light at around 580 nm. Your screen produces no 580 nm light at all when showing yellow. Instead it lights red and green together, and because your eye only has three color sensor types, the red plus green mixture triggers them in exactly the same ratio that true yellow would. Your brain cannot tell the difference. The effect is called metamerism, and it is the trick that lets three subpixel colors reproduce millions of perceived colors, including every yellow on this page.

Yellow Screen to Test Color Accuracy and Spot Banding

A full yellow screen is a useful test image because yellow is made from the red and green subpixels lit together with blue switched off. If your yellow looks greenish or too orange, it tells you the red or green channel is off balance, which is something a plain white screen can hide.

Open yellow fullscreen and look across the panel for tint shifts, where one area leans green or red, for patches that look darker or washed out, and for faint banding or stripes from the panel or your settings. For the clearest read, switch between yellow, white, and black to judge color, brightness, and contrast in a few seconds.

Download a Yellow Screen Background (480p to 8K)

Use the download panel to save a pure yellow image at 480p, 720p, 1080p, 1440p (2K), 2160p (4K), 4320p (8K) or a custom size. Common uses: warm toned wallpapers, attention grabbing slide backgrounds, high visibility test images and solid color layers for design work.

Frequently Asked Questions

What is the hex code for yellow?

Pure yellow is #FFFF00, which is rgb(255, 255, 0). Red and green are at their maximum of 255 and blue is at zero, because screens create yellow by mixing red and green light.

Does a yellow screen really emit no blue light?

At #FFFF00 the blue subpixels are set to zero, so on OLED screens essentially no blue is produced. LCD screens filter a white backlight and leak a small amount, but far less than showing white. Either way, yellow is one of the lowest blue light colors a display can show.

Is yellow light good for reading at night?

Yes, it is one of the better choices. It gives enough brightness to read comfortably while producing little of the 460 to 480 nm blue light that delays melatonin. Keep the brightness moderate, since very bright light of any color still affects sleep.

Do yellow lights actually keep bugs away?

They attract fewer bugs rather than repelling them. Most insects see ultraviolet, blue and green well and yellow poorly, so a yellow light is simply harder for them to notice. Insects already at your table will stay until something brighter and bluer appears.

Why do screens make yellow from red and green?

Because displays only have red, green and blue subpixels. Lighting red and green together stimulates your eye's color sensors in the same ratio that true 580 nm yellow light would, so your brain perceives identical yellow. The effect is called metamerism.

Does a yellow screen save battery?

A little, on OLED. Yellow lights two of the three subpixel colors, so it draws less power than white but more than red or black. On LCD screens the backlight stays fully on and the color makes almost no difference.

Can a yellow screen help me test my monitor?

Yes. Because yellow is red and green lit together, a pure yellow screen helps reveal color balance problems. If the yellow looks green or orange in places, your red or green channel may need calibrating. It also shows tint shifts, banding, and uneven brightness that white can hide.

Is this yellow screen tool free?

Completely free. No account, no watermark, and the downloaded yellow backgrounds are free for personal and commercial use.

Related screens: Dimmer and warmer for bedtime wind down, the orange screen · The gentlest light for dark adapted eyes is the red screen · Need maximum brightness instead? The white screen