Magenta Screen
Magenta is red and blue at full output with green completely off. Like purple it has no wavelength of its own, and like cyan it is a CMYK process ink — which makes it both a lighting colour and a diagnostic one.
What people use the magenta screen for
Find stuck green sub-pixels
Green is entirely off in magenta, so any pixel showing green is stuck on. This is the cleanest test for the green channel there is.
Print process reference
One of the four CMYK inks, useful as a rough on-screen check when reviewing proofs.
High-saturation accent light
Magenta is aggressive and saturated — good for club, synthwave and neon looks where subtlety is not the goal.
How to use the magenta screen
- 1Open the magenta screen — it fills the page immediately, no button needed.
- 2Press F or use the fullscreen button to go edge to edge with no browser chrome.
- 3Use the brightness slider to dial the output up as a light source or down for a dark room.
- 4Move the mouse or tap once to bring the controls back; they fade out on their own after a few seconds.
- 5Press a number key or use the colour strip to jump straight to another colour.
Frequently asked questions
How do I make the magenta screen fill my whole display?+
Press F (or click the fullscreen button) to enter true browser fullscreen, which hides the tab bar, address bar and taskbar. Press Escape to leave. On mobile, tapping the screen hides the controls; add the page to your home screen for a fullscreen launch every time.
What is the exact magenta colour used here?+
#FF00FF. You can copy it from the control bar, or open the colour picker to dial in any other value and keep it in the URL so the exact shade is bookmarkable.
Does this work on phones and tablets?+
Yes. It works in any modern browser on iOS, Android, Windows, macOS, Linux and ChromeOS. Nothing is installed and nothing needs an account.
Is it free, and are you tracking me?+
Free, with no sign-up. Every tool here runs entirely in your browser — no colour choices, screenshots or usage details are sent anywhere.