Test your device, right in your browser

If a colored dot, dark speck, or bright fleck won't go away no matter what's on screen, you're probably looking at a dead, stuck, or hot pixel. The fastest way to know for sure is to cycle your display through solid colors that strip away camouflage and make panel flaws stand out. This free tool fills your screen with nine solid colors plus a grayscale sweep in under two minutes, and it runs entirely in your browser: nothing you see is ever recorded or sent anywhere.