Use the live tool below to complete your test.
Screen Tester is a free, browser-based screen testing tool that lets you detect dead pixels, stuck pixels, and display issues.
A dead pixel test displays solid colors across your full screen to reveal defective pixels. Dead pixels appear as permanently black dots on every color. Stuck pixels are fixed on one color — red, green, or blue. Click Full Screen and cycle through each color to find any dead or stuck pixels on your monitor, laptop, phone, or TV screen.
An online screen tester helps you cycle through solid colors so you can inspect a monitor for dead pixels, stuck pixels, hot pixels, and uneven color areas. It is one of the simplest ways to check a new screen without installing software.
If you already know the exact problem you are chasing, jump to our focused black screen test, white screen test, dead pixel test, or stuck pixel test pages.
Solid colors remove distractions and make tiny defects much easier to see. A dead pixel stays black. A stuck pixel often stays red, green, blue, or white. Testing both black and white screens plus the main RGB colors gives you the clearest quick diagnosis.
If you only need a clean dark background for edge glow or bleed checks, open the black screen test. If you need a bright inspection surface for stuck pixels or tint, use the white screen test.
Screen Tester FAQ
