Blue Screen Online
A blue screen helps you check the blue color channel and create a clean full-screen blue background in the browser.
High brightness can feel harsh in a dark room. Lower brightness if your eyes feel strained.
Shortcuts: F fullscreen, Esc exit fullscreen where supported, Space controls, 1-9 preset colors, arrow keys cycle test colors. In dead pixel fullscreen, tap to advance and swipe left or right to change colors.
Quick answer
A blue screen helps you check the blue color channel and create a clean full-screen blue background in the browser. Choose a color, open it full screen, adjust brightness if needed, and press Esc to exit where supported.
Summary
| Best for | Opening a plain full-screen color quickly. |
|---|---|
| Main control | Color presets, brightness, timer and fullscreen. |
| Exit | Press Esc where supported or use the on-screen exit button. |
Why use blue
Blue can reveal subpixel issues that are not obvious on red or green. It is also useful for checking color uniformity on screens that show blue tint or uneven patches.
Use it as part of a set of solid-color checks rather than as the only test.
How to test
Open the screen in fullscreen, scan slowly, then compare with white, black, red, green and gray. Lower brightness if the blue feels intense.
Tool category
Browse more tools in Color Screens.
Related tools
Related guides
FAQ
Can a blue screen fix a monitor?
No. It only helps you inspect the screen visually.
What should I compare it with?
Compare blue with red, green, white, black and gray.