Blue Screen
A full screen of pure blue. Tap or press Full screen.
Quick answer: Press Full screen to fill your display with blue. A pure blue screen is used to check blue pixels and for plain blue backdrops.
Press F for full screen, Esc to leave. In a series, tap, press Space or use the arrow keys for the next colour.
Very bright full screens can be uncomfortable in a dark room. Do not look at them for long, and do not use them as a warning light on the road or a safety lamp.
How to use it
- Press Full screen or tap the blue area.
- Tap to change to white or black.
- Press Esc to leave.
Uses for a blue screen
- Checking for stuck blue pixels and uneven colour.
- Comparing screens side by side.
- A simple coloured backdrop or light.
The colour is pure blue (full strength on one channel and zero on the others). How it looks depends on your screen and its settings.
How to check a single colour
A screen makes every colour from red, green and blue light, so a pure blue screen shows whether the blue part of each pixel works. Look for dots that stay dark, and for patches that look washed out or a different shade. Look at the screen from a few different angles, because many screens change colour at an angle. Turn off night mode and colour filters first, because they change the colours you see.
What people use it for
- Pixel and colour checks
- Backdrops and lighting
- Comparing displays
Questions
What is a blue screen used for?
A pure blue screen is used to check blue pixels and for plain blue backdrops.
Is it safe for my screen?
Yes. It only shows a solid colour. Do not leave one static image on an OLED screen for many hours.
Is it free?
Yes. No sign-up, no install and no limit.
Is anything saved or sent?
No. Everything runs in your browser. Only your own best score, where a page shows one, is kept on your device.
Last updated 2026-10-24. Free to use, no sign-up. Made by ficklestudio26.