Click, tap or use the arrow keys to change colour. Esc or the Exit button closes the test. Clean the screen first so dust is not mistaken for a pixel defect.
Show solid colours to visually inspect a display for dots that remain dark, bright or the wrong colour. This is a manual inspection tool: it cannot automatically scan or repair your screen.
How to use this tool
Clean the screen, choose a colour or start the fullscreen test. Inspect the whole panel, including edges. Click, tap or use arrows to cycle colours. Esc or Exit returns to the page.
What this test can and cannot show
Dust and surface marks can resemble pixel defects. Fullscreen availability varies; an overlay is used when the browser rejects fullscreen. Results depend on your visual inspection and are not a warranty diagnosis. The tool displays no flashing repair sequence.
Updated October 1, 2026. Browser and device support varies.
Questions and troubleshooting
Can this test fix a dead or stuck pixel?
No. It only displays solid backgrounds for manual inspection. It does not scan the display or run a repair sequence. If a mark persists across backgrounds, document it and consult the display manufacturer’s support or warranty instructions.
How can I avoid mistaking dust for a screen defect?
Clean the screen using the manufacturer’s instructions, then inspect white, black and coloured backgrounds. Check whether the same dot stays at the same screen position. Dust and surface marks can resemble defects, so a visual result needs interpretation.
How this tool was checked
Automated Chromium checks on October 1, 2026 verified nine colour controls, arrow navigation and exit behavior. No physical panel was inspected, and the tool cannot automatically confirm a defective pixel.
Technical references: MDN: Fullscreen API