01
White Screen
Fills your entire screen with solid white. Cleaning the screen, spotting dust and dark…
Magenta Screen
Fills your entire screen with solid magenta. Testing red and blue together and checking for tint variation across a large panel.
Screen Tests
Nothing uploaded
No sign-up
Free, unlimited
Press Fullscreen, then look closely at the whole panel.
In short
A magenta screen lights red and blue together with green switched off entirely, which makes it the complement of green — the channel the eye is most sensitive to. That gives it two uses. Any pixel stuck on in green shows as a startlingly obvious bright dot, because it is the one colour the field does not contain and the one the eye picks out most readily. And tint variation across a large panel is easier to judge here than in most fields, because magenta sits between two primaries: if one side of the screen leans pink and the other leans purple, the red-to-blue balance is drifting across the panel. That is a common finding on large televisions and ultrawide monitors and is usually a panel characteristic rather than a fault. Magenta is sometimes called a pink screen, and searches for both land here. Judge it fullscreen in a dimly lit room with any colour-shifting night mode turned off, since a warm filter changes the balance you are trying to assess.
How to use the Magenta Screen
- The test starts on its own — no button to press and nothing to install.
- Follow the prompt in the test panel and watch the readings update live.
- Press Reset to start over with a clean slate.
About the Magenta Screen
The Magenta Screen fills your entire screen with solid magenta. Testing red and blue together and checking for tint variation across a large panel. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Testing red and blue together and checking for tint variation across a large panel.
- Checking a monitor or phone screen before a return window closes.
- Using as a plain backdrop for photography or for cleaning the screen.
Press Fullscreen above before judging anything. A colour patch surrounded by page furniture tells you very little — the panel needs to be filling the whole screen, ideally in a dark room, with any night-light or blue-light filter switched off.
Frequently asked questions
What is the difference between a dead and a stuck pixel?
A dead pixel receives no power and stays black on every colour. A stuck pixel is latched on and shows the same bright red, green or blue dot against every background. Stuck pixels sometimes recover; dead ones never do.
How do I tell a dead pixel from dust?
Dust sits on the outside of the glass and moves or disappears when you wipe the screen with a microfibre cloth. A dead pixel does not move and stays in exactly the same position on every colour.
How many dead pixels before I can return a monitor?
That depends on the manufacturer's policy, which is usually written against the ISO 9241-307 pixel fault classes. Most consumer panels are sold to a standard that tolerates several sub-pixel faults, so check the specific warranty terms — and photograph what you find while the panel is still within the return window.
Is there a limit on how often I can use the Magenta Screen?
It is free, with no account, no trial and no daily cap. Every screen tests tool on inputtesthub.com works the same way: open the page and use it.
Is the Magenta Screen safe to use with private information?
No. The Magenta Screen runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What do people use the Magenta Screen for most?
The most common reasons people reach for it: testing red and blue together and checking for tint variation across a large panel. Checking a monitor or phone screen before a return window closes. Using as a plain backdrop for photography or for cleaning the screen. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there a catch?
Press Fullscreen above before judging anything. A colour patch surrounded by page furniture tells you very little — the panel needs to be filling the whole screen, ideally in a dark room, with any night-light or blue-light filter switched off.
Why does the test start on its own?
No installation, no extension and no driver. The Magenta Screen uses the browser's own device APIs and begins as soon as the page loads, so there is nothing to press first. Press Reset at any point to start over with a clean slate.
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