What you can check
- Backlight bleed and glow: use black in a dark room.
- Uniformity and dark corners: use mid gray and white.
- Color channels: use pure red, green and blue.
- Dead or stuck pixels: cycle through every color.
How to test your monitor
- Let the screen warm up for a few minutes.
- Set brightness to your usual level and dim the room lights.
- Open fullscreen and move through colors with ← →.
- Compare the center, edges and corners for each color.
What this test can't do
It doesn't measure color accuracy with numbers or replace a hardware calibrator. It's a visual check to help you notice obvious issues.
Frequently asked questions
Is this a full screen test?
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Yes, each color fills the whole display in fullscreen mode.
Can I test a new monitor before returning it?
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Yes, that's a common use. Check the shop's return period and pixel policy.
Does it work on laptops and TVs?
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Yes, on any device with a modern browser.