Blue screen
Click the panel to fill your screen with blue. This is a solid color — not the Windows blue screen error.
What people use it for
Chroma key blue
Use #0047BB as a backdrop when your subject has green in it, so the key doesn’t eat into it.
Check blue subpixels
A dark dot on blue is a dead blue subpixel.
Mood light
A cool blue glow for a room, a game or a video background.
Backdrop
Sky blue makes a clean, bright background for product photos.
Keyboard shortcuts
- F
- Full screen
- Esc
- Exit full screen
- ← →
- Previous / next color
- ↑ ↓
- Brighter / dimmer
Every color
More screen tools
Dead pixel test
Five colors, one at a time, to find dead and stuck pixels.
Refresh rate test
See your screen’s real Hz and spot stutter.
Screen test
Gradients, black level, uniformity, gamma and sharpness.
Test pattern
Color bars and a test card at your native resolution.
Zoom light
A soft, warm light for video calls from a spare screen.
Background images
Plain color PNGs for desktops, phones and 4K.
Questions
Is this the Windows blue screen of death?
No. This page only shows a solid blue color. If Windows crashes with a blue error screen, write down the stop code and look it up on Microsoft Support.
What is pure blue?
#0000FF: the blue subpixels at full with red and green off.