The test cycles your whole screen through black, white, red, green, blue and other solid colours. A dead pixel shows as a black dot on bright colours, a stuck pixel stays red, green or blue, and backlight bleed appears as light patches on black.
What does this tool do?
Finds dead or stuck pixels: fullscreen solid colours (black, white, red, green, blue) to inspect every pixel of your screen. For testing new and second-hand displays.
Keep it bookmarked or on your home screen — utilities prove their worth through repetition, and the one you can open in two taps is the one you will actually use when the need strikes.
Using it is simple: “Start full-screen test” runs the tool. Results update live as you work — there is no waiting and nothing to submit.
How do I use this tool?
The tool is ready the moment the page opens — no setup, no account. The steps below cover everything it does.
- Provide the input the tool asks for.
- Click “Start full-screen test” to run the tool and see the result.
How does it work?
Dead pixels show as dark dots on bright colours; stuck pixels glow wrong colours on black. Cycling solid fullscreen colours makes each defect visible; the tool guides what to look for on each colour.
Timing and randomness use the browser’s high-resolution clocks and cryptographic random source — the best available in a web page, accurate far beyond what everyday uses need. Display rounding is the only approximation.
Use cases in Pakistan
Buyers inspect screens at Hall Road/Regal before paying; new laptop/phone owners verify panels within the return window; sellers prove their display is clean. A 30-second check beats discovering defects later.
These are the tools people recommend to each other on WhatsApp — simple, free, no install — because they solve the small problems everyone hits: timing something, picking fairly, testing a device. Bookmark the ones you use; they age well.
Limitations
It reveals defects; it cannot fix them (stuck pixels sometimes respond to gentle massage or flashing tools — no guarantees). Dust on the screen mimics dead pixels — clean first.
Convenience tools are not certified instruments: fine for everyday purposes, but do not stake safety, money or legal outcomes on a browser utility. Know which category your use falls into.
Frequently asked questions
Dead vs stuck pixel?
Dead = always black (no power); stuck = always one colour. Stuck sometimes recovers; dead rarely does. For anything time-sensitive, do a trial run first so you know exactly how the alert looks and sounds when it matters. Keep the tab visible and the device awake for timing tasks; background throttling is the main source of surprises.
How many dead pixels are “acceptable”?
Manufacturers allow a few per ISO 9241 — but retailers often exchange within the return window. Check your warranty terms. Keep the tab visible and the device awake for timing tasks; background throttling is the main source of surprises. Bookmark the tool if you use it more than once — utilities earn their keep through repetition.
Is that dot dust or a dead pixel?
Clean the screen and retest — dust moves, dead pixels don’t. Bookmark the tool if you use it more than once — utilities earn their keep through repetition. For anything time-sensitive, do a trial run first so you know exactly how the alert looks and sounds when it matters.
Fullscreen how?
The tool goes fullscreen automatically; press Esc to exit. Dim the room for best visibility. For anything time-sensitive, do a trial run first so you know exactly how the alert looks and sounds when it matters. Keep the tab visible and the device awake for timing tasks; background throttling is the main source of surprises.
Is my data uploaded or stored?
No. This tool runs entirely in your browser — what you type or paste never leaves your device, is never sent to a server, and is never stored. Closing the tab removes all trace. Keep the tab visible and the device awake for timing tasks; background throttling is the main source of surprises. Bookmark the tool if you use it more than once — utilities earn their keep through repetition.
Is it really free? Do I need an account?
Yes, free, and no account needed. Open the page and use it — no sign-up, no trial, no watermark on results. Bookmark the tool if you use it more than once — utilities earn their keep through repetition. For anything time-sensitive, do a trial run first so you know exactly how the alert looks and sounds when it matters.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested