Find blue stuck pixels
Yellow is red and green at full output with no blue, so a stuck blue subpixel shows up as a distinct cool dot.
Yellow screen · One click · No sign-up
A yellow screen,
free, fullscreen, and online.
Fill your display with bright yellow in one click — the brightest colour a screen can show, useful for panel tests, warm light, visibility, and bold backdrops.
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Take your yellow screen with you.
Download a plain yellow image for a wallpaper, reference, or offline display check. Choose HD, 4K, mobile, or square in PNG, JPG, or WebP.
One simple tool, useful everywhere
What is a yellow screen for?
Test peak brightness
Yellow is close to the brightest colour a panel can produce, which makes dim zones, banding, and backlight falloff obvious.
Signal and be seen
A fullscreen yellow phone is highly visible at distance — handy as an improvised marker, signal, or attention grabber.
Warm up a shot
Dim the brightness and use the screen as a soft warm bounce or fill beside a subject, a camera, or a small object.
How it works
Your yellow screen in 2 steps.
- Open the screen. Press the large button above or click the yellow preview.
- Go fullscreen. Use the browser permission prompt, then press Escape whenever you are done.
A practical colour guide
How to use a yellow screen online.
Why yellow is a useful test colour
Yellow occupies an unusual position among screen colours: it is produced by driving the red and green subpixels at full output while leaving blue entirely off. That combination makes it close to the brightest colour most panels can display, and it makes the missing channel conspicuous.
Open the screen, set the brightness where you want it, and scan the panel from a normal distance. Any pixel emitting blue when it should not stands out immediately as a cool speck in a warm field. At the same time the sheer brightness of yellow reveals dim zones, backlight falloff toward the corners, faint banding, and the cloudy patches sometimes called mura.
Yellow as part of a full display check
No single colour finds everything. Run yellow to expose blue subpixels and brightness variation, then follow it with red, green, and blue to catch the other stuck channels, white to check for tint and dirt, and the black screen for dead pixels and backlight bleed. Anything that survives every background is physically on or in the panel.
Keep conditions consistent if you are comparing two displays: same browser, same brightness, same room light, same viewing angle. An OLED phone and an older LCD monitor will never render the same RGB value identically, and a colour profile or night mode can shift the result enough to make one panel look faulty when it is fine.
Warm light without the blue channel
Because yellow uses no blue output, a screen showing it emits light that sits at the warm end of what a display can produce — the same principle behind night mode and warm colour profiles. Dimmed well down, that makes it useful as a gentle warm fill: angle the panel at a wall for a soft glow, or beside a subject to lift shadows without a colour clash against household lamps.
Be honest about the limits. Full-brightness yellow is intense, and staring into it is uncomfortable, so lower the brightness before you leave it running and keep it aimed at a surface. If you want the screen as a proper webcam light with a temperature you can dial in, the Zoom lighting tool is built for exactly that.
High visibility and practical uses
Yellow is what safety equipment is painted for a reason: it holds attention at distance and in poor light better than almost any other colour. A phone showing fullscreen yellow at full brightness is genuinely useful as an improvised marker — finding someone in a dark venue, flagging a spot in a field, marking a bag, or making a stage cue impossible to miss.
It is also the easiest way to preview how something reads against a strong warm background. Hold a printed page, a product, or a colour swatch in front of the screen and you can see contrast problems instantly, without opening a design tool or building a mockup.
Yellow backdrops and downloads
A screen makes an even, crease-free backdrop that no fabric can match at small scale. Put a phone or a monitor behind an object for a bold product shot, a flat-lay accent, or a colourful video call background. Watch for reflections on glossy surfaces and glasses, and always judge the result through the camera — automatic white balance shifts hard when a strong colour fills the frame.
For an offline file, use Download image and choose HD, 4K, mobile, or square in PNG, JPG, or WebP. PNG keeps the value exact for design work; JPG is fine for a wallpaper or a quick background. The same generator is available on the black screen image page if you need the neutral version.
Free, private, and instant
Everything runs in your browser: brightness, fullscreen, cursor hiding, and the image download. There is no account, nothing is uploaded, and nothing is installed, so the page works the same on a work laptop, a borrowed machine, or a phone in a shop.
Use a comfortable brightness and take breaks — bright yellow is fatiguing over long periods. For colour-critical work, accessibility certification, or display calibration, use measured equipment and the relevant standard. For a quick test, a bold background, or a splash of warm light, this free yellow screen opens in one click.
For the most useful result, make one adjustment at a time and compare the yellow screen with another solid colour when needed. A consistent viewing position, comfortable brightness, and a current browser will make this quick screen tool easier to use and repeat.
Helpful answers
Yellow screen FAQ
What can I use a yellow screen for?
Testing a display for blue stuck subpixels and brightness uniformity, using the panel as a warm light source, making an object or a phone highly visible, and creating a bold backdrop for photos or video. It is also a quick way to preview how a design reads against a strong warm background.
Why is yellow good for finding stuck pixels?
Yellow is made from full red and full green with the blue subpixel switched off. Any pixel showing blue where it should not is completely exposed — it appears as a small cool dot against a bright warm field, which is very hard to miss.
Is a yellow screen easier on the eyes?
Yellow contains no blue output, which is why warm and night modes shift towards it. But this page is bright yellow, not dim amber, so it is not a comfort setting — lower the brightness slider a long way before using it for any length of time in a dark room.
Can I use it as a light?
Yes, as soft warm fill at close range. A screen is a large, gentle source, which is flattering, but it is far dimmer than a lamp or an LED panel. Aim it at your subject rather than into anyone’s eyes and check the result on camera.
What shade of yellow is it?
The screen renders #FACC15, RGB 250, 204, 21 — a warm golden yellow that stays readable and vivid rather than the acid green-yellow of pure #FFFF00. Downloads use the same value.
Does it work on a phone?
Yes. Open it in any current mobile browser and tap for the largest available view. A fullscreen yellow phone at maximum brightness is one of the most visible things you can hold at night.