HexScreen / Red Screen
#FF0000 · Free · No adsRed screen for pixel tests and night light.
Pure red for checking red subpixels and as a gentle light that preserves night vision.
Tip: F starts fullscreen, Esc exits.
How it works
Pick a color
Choose a preset or set any shade with the color picker.
Start fullscreen
Click the preview or press F. The color fills your entire screen.
Use it and exit
Switch colors with ← →, return with Esc or a double-click.
What you can use it for
Red subpixels
Reveal defects in the red channel.
Night vision
Red light dazzles less in the dark, e.g. for stargazing.
Photo light
Colored accent light for creative shots.
Signal
A highly visible sign, e.g. “Do not disturb”.
Download Red Screen as an image
Created right in your browser, in full resolution and without a watermark.
Good to know
Red in the dark
Red light affects your eyes' dark adaptation less than white light. With a dimmed red screen you can read at night or use star charts.
Frequently asked questions
How do I start fullscreen mode?
Click the preview, the “Start fullscreen” button, or press the F key. Press Esc or double-click to exit.
Does it work on phones and tablets?
Yes. Android and most desktop browsers use true fullscreen. On iPhone the color fills the browser window; add the page to your home screen for true fullscreen.
Can I change the color in fullscreen?
Yes. Move the mouse or tap the screen to show the color bar, or use the arrow keys.
Is it free?
Yes, all tools and image downloads are free, with no sign-up and no ads.
Is a bright screen bad for my eyes?
Not with normal use. Lower the brightness for longer sessions and take regular breaks.