Dead Pixel Tester
Check a screen for dead, stuck and bright pixels. It runs directly in your browser.
Local processingProcessed locally in your browser
#000000This test displays exact browser colors for visual inspection. Clean the screen first and check at a comfortable brightness. Native fullscreen depends on the browser; system bars may remain visible on some phones and tablets.
Good for
Display solid black, white, red, green, blue and gray screens to visually inspect a monitor, laptop, tablet or phone display.
Limits
This is a visual inspection tool and cannot diagnose or repair hardware. Browser or system controls may remain visible when native fullscreen is unavailable.
Inspect a screen with solid test colors
A dead pixel test helps you look for a point that stays dark, bright or one color while the background changes. Inspect the screen yourself: the tool displays colors and cannot read the condition of your display.
How to use
- Make sure the screen surface is clean so dust is not mistaken for a pixel defect. Open the page on the display you want to inspect.
- Start the test and cycle through black, white, red, green, blue and gray. Use the on-screen controls, or the left and right arrow keys.
- Hide the controls to inspect the covered area, then check whether a suspicious point stays in the same physical location across colors. Press Escape or use the exit control to finish.
Common questions
Does the test fix dead or stuck pixels?
No. It displays steady colors for visual inspection and does not repair the screen or run a flashing-pixel treatment. Use the display manufacturer's guidance if you find a persistent defect.
Why are the browser controls still visible?
Native fullscreen depends on your browser and device. If it is unavailable, the test covers only the browser viewport and shows a notice. An area covered by browser or system controls has not been inspected.
Can I use this on a phone or an external monitor?
Yes, if its browser can display the page. For an external monitor, move the browser window onto that monitor before starting. On a phone, use the touch controls and inspect any areas hidden by browser controls separately.