Dead Pixel Test
Fill the whole screen with black, white, red, green and blue in turn and look for dots that don’t match. Great for checking a new monitor or a used laptop.
What “runs on your device” means for this tool
When you open this page, your browser downloads the tests themselves, the same way any web page loads. From then on, everything runs inside your browser, on your own device. The keys you press and your clicks are never sent to this website's server or to anyone else, and nothing is saved.
Visit counting: this site counts visits with privacy-friendly analytics. No cookies, no ads, no tracking across other sites, and your IP address is not stored. It records which page you opened, your country, your device type and how long you stayed.
Press any key. Keys turn green once they've worked; the one you're holding lights up orange.
How to use the Dead Pixel Test
- Clean the screen so dust doesn’t fool you.
- Press Start full-screen test.
- Click or press → to step through the colors.
- Look closely for dots that stay black or one bright color.
Questions
What is the difference between a dead and a stuck pixel?
A dead pixel is always black. A stuck pixel is stuck on red, green or blue and shows up on the other colors.
Can a stuck pixel be fixed?
Sometimes. Running flashing colors over it for a while, or gentle pressure with a soft cloth, can free it. Dead pixels usually can’t be fixed.
Does it work on phones and TVs?
Yes, on any screen with a browser.
Popular uses: Keyboard, Mouse & Screen Test · Keyboard Tester · Click Speed Test (CPS)
Still stuck, or want a tool that isn't here? Ask on the Nebula Discord.