ABOUT

Built to make pixel testing fast and free.

Dead Pixel Test is an independent, browser-based tool for finding dead, stuck, and hot pixels on any display. No install. No account. No data collected.

What this is

Dead Pixel Test gives you a fast, clean way to check your screen for pixel defects. The tool cycles your entire display through ten fullscreen color patterns — each one designed to reveal a specific type of defect that's easy to miss in normal use but immediately obvious on the right background color.

It works on any display type — IPS, LCD, OLED, AMOLED, TN — and on any device: desktop monitor, laptop, phone, or tablet. Nothing to install, no account to create, no information to provide. Open the page and you'll know within two minutes.

Why we built it

Most pixel testing tools are cluttered with ads, require software downloads, or bury the actual test behind multiple steps. We wanted something cleaner: a single-purpose tool that does one thing well, loads instantly, and works everywhere without friction.

The pixel detector and repair tool together cover both sides of the problem — find the defect, then try to fix it — all in the browser, at no cost.

What the tools do

The Pixel Test runs your screen through ten fullscreen color screens: black, white, red, green, blue, cyan, magenta, yellow, checkerboard, and a grayscale gradient. Each one targets something different:

  • Black — reveals hot pixels (sub-pixels stuck fully on)
  • White — shows dead pixels (sub-pixels stuck off)
  • Red, green, blue — isolates individual sub-pixel failures
  • Cyan, magenta, yellow — catches mixed sub-pixel faults
  • Checkerboard & gradient — exposes neighbor-dependent and brightness defects

The Pixel Repair tool flashes the affected area through thousands of color changes per second. This rapid cycling can sometimes break a stuck sub-pixel transistor out of its frozen state. It doesn't always work, but it's always worth trying before filing a warranty claim or visiting a repair shop.

Privacy

Everything runs locally in your browser. Nothing is sent to any server. There are no accounts, no analytics, no advertising, and no cookies. We use your browser's localStorage to remember two things: your color theme preference, and whether you've acknowledged the flash warning on the repair page. Both stay on your device. See our Privacy Policy for the full details.

Get in touch

Questions, bug reports, or feature ideas? Use the Contact page to send us a message — we read every one.