Run a pixel test
A saturated blue field makes red and green stuck subpixels jump out — they read as bright warm dots against the blue.
Blue screen · One click · No sign-up
A blue screen,
free, fullscreen, and online.
Fill your display with solid blue in one click — a fast pixel test, a cool backdrop, or a calm light source. Free, adjustable, and gone the moment you close the tab.
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Take your blue screen with you.
Download a plain blue 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 blue screen for?
Check uniformity
Solid blue exposes banding, blotchy patches, and dust on the glass that a normal page hides completely.
Light a scene cool
Dim the brightness and use the display as a cool practical light for a stream, a shelf, or a product shot.
Make a plain backdrop
Put a clean, saturated blue behind a small subject, a video call, or a photograph without hanging anything.
How it works
Your blue screen in 2 steps.
- Open the screen. Press the large button above or click the blue preview.
- Go fullscreen. Use the browser permission prompt, then press Escape whenever you are done.
A practical colour guide
How to use a blue screen online.
What a blue screen shows you
A single, uninterrupted colour field is the only way to see a display rather than read through it. Text, icons, and photographs are exactly the kind of visual noise that hides a small defect, which is why every panel test starts with flat colours. Open this blue screen, set a comfortable brightness, and look at the panel from your normal viewing distance rather than pressed against the glass.
What blue is particularly good at is exposing warm-coloured faults. A red or green subpixel that has stuck on will glow as a small warm dot in the middle of a cool field, far more visibly than it would against white. The same flat surface also reveals dust on the glass, faint vertical banding, and areas where the backlight is uneven.
Using blue as part of a pixel test
A proper pixel test means cycling through several solid colours, because different faults hide behind different backgrounds. A truly dead pixel stays black no matter what — so black and white screens catch it. A stuck subpixel is the opposite: it shows on the colours that leave it exposed. Blue leaves red and green subpixels nowhere to hide.
Scan slowly from corner to corner rather than staring at the centre, and check the edges and corners where backlight bleed and pressure marks tend to appear. Do not press the panel while inspecting it — pressure creates temporary patterns that look exactly like a fault. If a mark stays in the same place across blue, red, green, white, and the black screen, it is on or in the panel rather than in the image.
A blue screen is not a blue screen of death
The phrase sends a lot of people here by accident. A blue screen of death is what Windows shows when the operating system hits an unrecoverable error: a blue background with a message, a sad face, and a stop code such as MEMORY_MANAGEMENT or IRQL_NOT_LESS_OR_EQUAL. It appears without being asked and usually forces a restart.
This page is the opposite — a blue surface you opened deliberately, with controls that stay put until you choose fullscreen. If you are actually chasing a crash, the stop code is the thing to search for, along with recent driver and memory changes; nothing on this page will help with that.
Blue light, ambience, and backdrops
Dimmed right down, a monitor makes a decent cool practical light. Angle it at a wall, a shelf, or the edge of a desk and you get a wash of blue that costs nothing and needs no lamp — useful behind a streaming setup, in a product photograph, or as a temporary mood change in a room. Keep it aimed at a surface rather than into anyone’s eyes, and start dim: saturated blue at full brightness is harsh in a dark room.
As a backdrop, a screen gives you a perfectly even field of colour with no creases and nothing to iron. Put a small object in front of it for a clean reference shot, or set a second display behind you on a call. Watch for reflections in glasses and glossy surfaces, and check the camera preview rather than trusting your eye — automatic white balance often shifts a strongly coloured scene.
Blue on any device, or as a file
The tool runs in any current browser on a laptop, desktop, tablet, or phone. On mobile, tap the preview for the largest available view; a portrait phone is handy for lighting a small object, while a landscape monitor gives a wider field for a camera or a wall wash.
When you need the colour offline, use Download image and pick HD, 4K, mobile, or square. PNG keeps the value exact, JPG makes a smaller file for everyday backgrounds, and WebP suits web projects. Matching the size to the destination avoids scaling the file up later.
A simple, private colour tool
There is no account, no upload, and nothing to install. Brightness, fullscreen, cursor hiding, and the generated image are all handled by your own browser, which makes this practical for a quick monitor check at a desk, a temporary backdrop, or a lighting experiment when the proper equipment is elsewhere.
Treat it as a visual tool rather than a measurement. For colour grading, accessibility certification, or professional calibration you need measured equipment and a defined standard. For everything ordinary — a pixel test, a backdrop, a splash of colour — this free blue screen is ready in one click.
For the most useful result, make one adjustment at a time and compare the blue 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
Blue screen FAQ
What is a blue screen used for?
Most people open one to test a display: solid blue makes stuck red or green subpixels, banding, and dust obvious. It also works as a cool backdrop, a soft coloured light, and a plain background for photos or video calls.
Can a blue screen find dead pixels?
It finds part of the story. A dead pixel stays black on every colour, while a stuck subpixel shows as a bright dot on some colours and not others. Blue is best for catching red and green stuck subpixels — cycle through white, black, red, and green as well for a full check.
Is this the same as a blue screen of death?
No. A blue screen of death is a Windows crash screen with an error code. This is a plain blue surface you open on purpose, and every control stays available until you enter fullscreen.
Can I use this blue screen for chroma key?
Only in an emergency. Broadcast blue screen keying needs an evenly lit, matte, specific shade of blue — a monitor is glossy, uneven at the edges, and shows moiré on camera. Use it for a coloured background, not for keying work you will have to deliver.
Does the blue screen work on a phone?
Yes. Open it in any current mobile browser and tap the preview for the largest available view. On iOS, adding the page to your Home Screen removes the Safari bars.
What shade of blue is it?
The screen renders #2563EB, RGB 37, 99, 235 — a strong mid-blue that stays saturated on most panels without the harshness of pure #0000FF. Downloads use the same value.