How to use Dead pixel test
Clean the screen, then tap Start fullscreen test. Look closely at the whole screen on each color. Tap or press the right arrow for the next color, and Esc (or the Exit button) to leave. iPhone Safari cannot enter true fullscreen, so the browser bars may remain.
Open the tool
Use the workspace below — no signup is required.
Enter your input
Clean the screen, then tap Start fullscreen test. Look closely at the whole screen on each color. Tap or press the right arrow for the next color, and Esc (or the Exit button) to leave. iPhone Safari cannot enter true fullscreen, so the browser bars may remain.
Copy the result
Copy text or download a file when the tool offers an export. Local tools keep processing in this tab.
About this tool
Check a new monitor, laptop, phone, or TV browser for dead and stuck pixels. Start the fullscreen test and tap (or press →) to step through nine solid colors, or let it auto-cycle every 2.5 seconds. A dot that stays black on every color is likely dead; a dot stuck on one color is likely stuck. The test only displays colors — it cannot repair pixels — and it does not flash.
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