UtilityBaseScreen Tools
Green Screen
Solid green fullscreen — test green subpixels or use as a chroma key backdrop.
Updated January 6, 2026
How to use the green screen
- 1Click the color area or the fullscreen button to enter fullscreen.
- 2Move the mouse or tap the screen to show or hide the toolbar.
- 3Use the brightness slider to dim the color if it is too intense.
- 4Press Esc or the exit button to leave fullscreen.
Common uses
- Improvise a chroma key backdrop with a spare display.
- Isolate faulty green subpixels during pixel testing.
- Check panel color uniformity.
Frequently asked questions
How do I make my whole screen green?
Open the tool and press the fullscreen button (or the F key). The entire display turns green. Press Esc or F again to exit fullscreen.
Can I adjust the brightness?
Yes. Use the brightness slider in the toolbar to dim the screen without changing your system settings. This is a software dimmer applied on top of the color.
Will my screen turn off while the color is displayed?
The tool requests a screen wake lock in browsers that support it, which prevents the display from sleeping while the tool is active. If your browser doesn't support wake locks, adjust your system sleep settings for long sessions.
Does this work on phones and tablets?
Yes. On mobile, tap the fullscreen button to hide the browser interface where the platform allows it. Tap anywhere on the screen to bring the controls back.
Can I really use this as a chroma key background?
For small objects or face-cam framing, yes — display the green screen on a monitor or tablet behind the subject and key it out in your editor. Even lighting and avoiding screen glare give the cleanest key.
About this tool
The green screen tool fills your display with pure green (#00FF00). Beyond testing the green subpixels of your panel, a bright green display is a practical improvised chroma key backdrop: point a camera at a monitor or tablet showing this screen and key out the green in your video editor. For pixel testing, dark dots on the green field indicate dead green subpixels, while off-color dots point to other stuck subpixels.
Like everything on UtilityBase, the green screen runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more screen tools here.
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