Monitor Test – Colours, Gradients & Uniformity Check
Full-screen coloursIn full screen: click or press → for the next colour, Esc to exit.
Ready
- Runs locally, nothing uploaded
- Allow permissions when asked
- Some sensors need a phone
- Runs inside your browser
- No upload, no account
- Nothing saved after you close
Online monitor colour test
This monitor test fills the screen with solid colours and grey levels so you can spot dead pixels, backlight bleed, uneven brightness and banding. Run it in full screen in a dim room.
Uniformity
A mid-grey screen should look even; darker corners indicate backlight unevenness.
Colour tint
White with a blue or yellow cast suggests colour temperature settings.
How to Use the
Monitor Test
- 01
Dim
darken the room for black tests.
- 02
Full screen
press Start.
- 03
Cycle
step through colours and greys.
- 04
Note
look for blotches, tints and bleed.
Uniformity
A mid-grey screen should look even; darker corners indicate backlight unevenness.
Colour tint
White with a blue or yellow cast suggests colour temperature settings.
Patterns
Jump straight to a pattern
Click the preview to cycle colours without full screen.
Full-screen mode
Test your display in full screen
Press Start full screen; use arrow keys to change patterns.
Related guides and fixes
Learn more in these guides: Webcam not working, Keyboard ghosting explained, Fix mouse double clicking, Webcam settings.
Frequently Asked Questions
Q.Should black be pure?
On LCDs it glows slightly; OLED is pure black.
Q.Calibrate?
Use a hardware colorimeter for accuracy.
Q.Is anything uploaded?
No. Everything runs locally in your browser.