What is a blue screen used for?
A blue screen turns a display into a flat, even surface of one colour, used for lighting, backdrops, tracing and checking a panel for faults.
Blue was the original chroma key colour, used for decades before green took over. It is also the dimmest of the three channels by a wide margin: under the standard used for HD video, blue contributes just 7% of a picture's brightness against green's 72%.
- Chroma key backdrops when green would spill onto hair or skin.
- Checking the blue channel alone for tint, banding or dead columns.
- Cool-toned fill light for photography and video.
Blue held the chroma key role before the green screen took over. If you want brightness instead, the white screen is the top of the range; for the same hue at a fraction of the output there is the navy screen.
How do you make your screen blue?
Open this page and press Full screen, or press F. The colour fills the display and every other element disappears until you press Escape.
The colour is painted before any script runs, so there is no flash of white before the page settles. On a phone or tablet, add the page to your home screen and it opens straight into the screen with no browser interface at all.
Is this the blue screen of death?
No. This is a plain blue background you chose to open. Nothing has crashed and nothing is wrong with your computer.
If you were looking for the Windows crash screen, there is a fake blue screen of death in the prank section. If your machine really is showing one, it will have a stop code printed on it and this page will not be open.
Is looking at a blue screen bad for your eyes?
No. A blue screen emits very little light, so it is among the easier things to look at for a long stretch at any brightness.
Digital eye strain comes from reduced blink rate and sustained focus at one distance rather than from the colour on screen. The usual advice is the 20-20-20 rule: every 20 minutes, look at something 20 feet away for 20 seconds.
Will my screen go to sleep while this is open?
Not with Keep awake switched on. It holds a browser wake lock, which asks the operating system to keep the display on with no input.
The wake lock is released the moment you leave the page, so it cannot keep your screen on by accident. Browsers also drop the lock whenever the tab is hidden; this page takes it again automatically when you come back.
How do you download a blue background image?
Open the download panel, choose a format and a size, and the blue image is generated and saved immediately. No watermark, no account.
PNG, JPG and WEBP are available from a single pixel up to 8K (7680 × 4320). PNG files are generated on the server as a one-bit palette image, which is why even an 8K download is only a few kilobytes. Direct links work too: blue-1920x1080.png.
Does the blue screen work on a phone, tablet or TV?
Yes, on any device with a browser. Add it to your home screen on mobile, or open the link in a TV browser and tap once.
On iOS, Safari does not allow a web page to enter true fullscreen, so the page fills the viewport instead and the result is the same once you add it to your home screen. On a TV, casting the tab also works.
Can you get a screen in an exact shade rather than this blue?
Yes. Every hex code has its own page: put the six characters after /screen/ and that link opens the exact shade on any device.
This blue is #0000FF. Any other shade works the same way: put its six characters after /screen/ and that address opens the exact colour. Because the colour travels in the URL, sending someone the link is a reliable way to agree on a shade without screenshots or colour pickers. The named colour screens all have their own pages, and the screensavers, prank screens and display tests live in the full list of screen tools.
Put this screen on your site
The embeddable version is the screen and nothing else, sized to whatever box you give it.