Check blue subpixels
Look for dim areas, stuck pixels, and inconsistent color across the panel.
Free online display tool
Blue Screen
Fill your display with a calm blue field for RGB diagnostics, ambient lighting, presentation backgrounds, and creative work.
No sign-upRuns privatelyWorks on every device
Tap twice or swipe down to exit
Press F
Useful by design
What can you do with a blue screen?
One plain color can be surprisingly handy. Here are a few practical ways to use it.
Make a cool-toned light
Use the screen as a quick blue accent for photography or streaming.
Create a clean backdrop
A uniform blue field keeps attention on your subject or slide content.
Three quick steps
How to use this full-screen tool
- 1
Choose your color
Use the default blue or pick a precise custom shade.
- 2
Open full screen
Tap the main button or press F. iPhone users get an automatic browser-safe fallback.
- 3
Exit when finished
Press Escape, double-tap, or swipe down. Nothing is stored or uploaded.
More colors
Switch the mood in one click
Good to know
Frequently asked questions
How do I make my screen blue?+
Press Open full screen. The tool works on phones, tablets, laptops, and desktops.
Does this cause a blue screen error?+
No. It only shows a blue webpage; it does not imitate or trigger a system crash.
Can blue reveal dead pixels?+
It can help identify pixels or blue subpixels that do not light correctly.
Can I use a custom blue shade?+
The color picker lets you switch to any shade before opening full screen or downloading it.
Need a background file?
Choose a resolution above and create a clean PNG in seconds.