Full Red Screen

A pure red full-screen canvas for night lighting and screen testing.

Preview: #ff0000

Press Esc or click the screen to exit full screen.

Full Red Screen

Turn your whole display into a solid red canvas with one click. Press Go full screen and the page fills the monitor, hiding browser bars, tabs and distractions. It works in desktop, laptop, tablet and phone browsers that support the Fullscreen API.

What a red screen is useful for

  • Night-vision friendly light. Red light barely disturbs dark adaptation, so it suits stargazing, camping, cockpit-style reading and checking things in a bedroom without waking anyone.
  • Subpixel and dead pixel tests. A pure red field reveals pixels whose red subpixel is stuck off, plus color banding and uneven tint on the panel.
  • Photography and video. Use it as a vivid backdrop, a colored gel substitute or a mood light for portraits and product shots.
  • Signals and mood. A red screen works as a simple stop signal, party light or visual alarm.
  • Display calibration. Compare how red renders across monitors, projectors and phones.

How to use it

  1. The red preset is already selected. Switch to White, Black, Blue or a custom hex such as #cc0000 if you need another shade.
  2. Press Go full screen.
  3. Press Esc or click the screen to return.

The preview box shows exactly what the display will look like, and the custom hex field accepts three or six digit codes with or without the hash sign.

Tips

Lower the brightness for night use and raise it to maximum for testing. Clean the glass first so smudges are not mistaken for defects, and view the panel straight on because viewing angles shift perceived color. On OLED screens avoid leaving a static color up for many hours.

Privacy

Everything runs in your browser. Nothing is uploaded and no data is stored.

Frequently Asked Questions

Press the Esc key or click anywhere on the screen. Browsers always let Esc leave full screen mode, so you cannot get stuck.

Yes. Red light barely affects the rod cells that handle low-light vision, which is why astronomers, pilots and photographers use red lamps. Turn the screen brightness down low and a red display becomes a gentle light that keeps your eyes dark-adapted.

Fill the display with red and look for dots that are black, green or blue. A pixel that cannot show red points to a faulty red subpixel. Cycle through the other colors with the buttons for a complete check.

It works for rough tasks such as reading a negative or finding your way around, but a phone or monitor is not a certified safelight. For light-sensitive photographic paper, use a proper safelight.