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Device Tests

Dead Pixel Test

Dead Pixel Test is part of Toolspire and is ready as soon as this page loads. Step through black, white and the primary colours full screen. A pixel that never changes is dead or stuck. A fine grid makes a single bright dot easier to see.

Runs in this tabFreeNo account

On this page

What you can do here

Solid primary colours

Each subpixel — red, green and blue — gets a screen of its own, plus the mixes and black and white.

Full-screen layer

The colour covers the site, including the header, so you can scan the whole panel.

A pixel grid

The last screen draws a fine white grid. A stuck-on pixel shows up between the lines.

Keyboard or click

Arrows and the space bar step through colours. Escape, or Close, leaves the test.

The sequence

How to look for a dead pixel

  1. 1

    Open the full-screen test

    Press Open full screen. Dim the room if the panel is glossy.

  2. 2

    Step through the colours

    Click the colour, or press the right arrow. Look for a dot that does not match the rest of the screen.

  3. 3

    Check black and white

    Dead pixels show on white and on bright colours. Stuck-on pixels show on black.

  4. 4

    Use the grid

    The grid screen is for a single bright pixel that is hard to see on a flat colour.

Worth knowing

  • Dead Pixel Test on Toolspire: fills the browser with black, white, red, green, blue, cyan, magenta, yellow, gray and a fine grid.
  • Click, or the left and right arrow keys, moves to the next colour. Escape closes the test.
  • A pixel that stays black on every colour is dead. A pixel that stays one colour is stuck. A pixel that is always bright is a hot pixel.
  • The grid is an 8-pixel lattice on black, which makes one lit pixel stand out.
  • The test is only colours on the page. It does not read the screen and does not upload a photo of it.

Dead, stuck and hot

What you seeWhat it usually is
Always black, on every colourA dead pixel. The transistor is not lighting that dot.
Always red, green or blueA stuck subpixel. One channel is on or off permanently.
Always bright, especially on blackA hot pixel. Common on camera sensors too, but on a monitor it is a stuck-on cell.
A smudge that moves when you press gentlyPressure on the panel, not a dead pixel. Stop pressing — panels bruise.

The browser frame is still visible

Phones and some browsers will not let a page hide the address bar. Scroll that bar away, or rotate to landscape, then run the colours again. The dots you are hunting are on the panel, so a thin browser strip does not hide them.

FAQ

Questions about Dead Pixel Test

Where does Dead Pixel Test run?

Dead Pixel Test runs in this tab on Toolspire. What you type or drop in is not sent to us and is not stored on a server.

How do I test for dead pixels?

Open the full-screen test and look at each solid colour from close up. A dot that stays black while the rest of the screen changes is dead.

What is the difference between a dead and a stuck pixel?

A dead pixel stays black. A stuck pixel stays lit in one colour — red, green, blue or white — no matter what the screen is showing.

Can this test fix a dead pixel?

No. It only helps you see one. A stuck pixel sometimes frees if the colour around it is flashed for a long time, but a dead pixel does not come back. Check the warranty before trying any “pixel massage”.

Why is there a grid?

On a flat black screen a single bright pixel is easy to miss. The grid gives the eye lines to follow so a dot between them stands out.

Does the test photograph my screen?

No. It only changes the page colour. It cannot see the panel, and it does not upload anything.

Keep going

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