Dead pixels are stuck or unlit dots on an LCD/OLED panel. You can spot them in a browser — no software install required.

Quick online check

  1. Open a full-screen screen test in your browser.
  2. Cycle through solid colors (white, black, red, green, blue).
  3. Look carefully for dots that stay the wrong color or stay dark/bright on every screen.
  4. For a focused walkthrough, see the dead pixel guide.

Tips

  • Dim the room lights and sit close to the display.
  • Test at native resolution (not scaled).
  • Note which color fails — that helps when talking to support or a retailer.

More free tools and guides: Screen Issues.