Dead Pixel Test
Check your screen for dead or stuck pixels online free with fullscreen color tests, plus a stuck pixel fixer. Free online monitor and phone screen test.
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Free, no sign-up, works in the browser — send it to a friend or add it to your site.
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Part of the toolkit
How to use Dead Pixel Test
- 1Clean the screen, then click Start dead pixel test to fill the screen with black
- 2Click, tap or press the arrow keys to cycle through white, red, green, blue, gray and more while looking for dots that don't match
- 3If you find a stuck pixel, try the stuck pixel fixer's flashing colors over that spot for 10–20 minutes
Frequently asked questions
What is the difference between a dead and a stuck pixel?▾
A dead pixel stays black on every color because it gets no power. A stuck pixel stays lit in one color (red, green, blue or white). Stuck pixels can sometimes be fixed; dead pixels usually cannot.
How do I check a new monitor or phone for dead pixels?▾
Run the full-screen test in a dim room and look closely at each color, especially black and white. Check right after purchase — many stores and manufacturers only exchange screens within a short return window.
Does the stuck pixel fixer really work?▾
Sometimes. Rapid color changes can un-stick a pixel that is partially stuck; results vary. It cannot fix dead pixels or physical damage.
How do I test for backlight bleed?▾
In a dark room at full brightness, show the black screen and look for lighter patches along the edges and corners — that is backlight bleed or IPS glow.
Embed Dead Pixel Test on your website▾
Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.