AI Learning Gym
Free screen testing and monitor tools
← Back to DashboardAI Learning GymFree screen testing and monitor tools
← Back to DashboardPick a color below, then click Go Fullscreen to fill your monitor. Use this to spot dead or stuck pixels, check for backlight bleed, or use your screen as a bright light source.
A dead pixel is a tiny dot on your screen that stays permanently black, white, or stuck on one color no matter what the display shows. They're easiest to spot against a solid background — the contrasting color makes the bad pixel stand out sharply.
Here's the quickest way to run a full check:
Beyond pixel testing, a white or brightly colored screen has plenty of practical uses. It works as a light panel for photography or video lighting, as a soft background for scanning documents, or as a quick way to check whether a laptop screen has any pressure marks or scratches.
A dead pixel gets no power at all and shows as a permanent black dot. A stuck pixel is still receiving power but is fixed on one color — usually red, green, or blue. Stuck pixels sometimes recover on their own or respond to pixel-refreshing tools, while true dead pixels are usually permanent hardware defects.
Yes — it works on any device with a modern web browser, including desktop monitors, laptops, tablets, and phones. The fullscreen mode uses your browser's native fullscreen API to fill the entire display.
True dead pixels (permanently dark) are hardware failures and cannot be fixed in software. Stuck pixels sometimes respond to rapid color cycling or gentle pressure. Whether dead pixels qualify for a warranty repair depends on the manufacturer — many have a minimum threshold of 3–5 pixels.
Each sub-pixel inside a display is either red, green, or blue. A defective sub-pixel only shows up clearly when the matching color is displayed. Testing only on white can miss sub-pixel failures that only a red, green, or blue background would reveal.
Yes. Displaying a solid color puts no more strain on your screen than any other image. OLED screens can develop burn-in from static images shown for very long periods, but a few minutes of pixel testing poses no real risk.