Fullscreen Background & Screen Test
Runs locally in your browserFill your screen with a color, gradient, image, monitor test pattern or gentle screensaver
Shortcuts: F fullscreen · ← / → previous or next · Esc exit
Settings
Live Preview
1 of 7: Slate
CSS
.fullscreen-background {
position: fixed;
inset: 0;
margin: 0;
background-color: #1e293b;
}
Fullscreen Background & Screen Test
Show a solid color, gradient or local image fullscreen, run monitor test screens, or start a gentle moving screensaver.
How to Use
Pick a mode, adjust its settings and press Enter Fullscreen or F. Use the arrow keys or Previous/Next to switch presets and Esc to exit. Controls hide after a few seconds and return when you move the pointer, tap or press Tab.
Screen Test Tips
Use these screens to look for stuck pixels, uneven backlight and banding. It is a visual aid, not a calibration or certification, and it cannot change hardware brightness.
Limits and Privacy
Fullscreen depends on the browser Fullscreen API; when it is blocked, a labeled full-window preview is available. Images up to 50 MB and 40 megapixels stay in memory only. Display settings may be saved in browser storage.
