Blue Out Screen

White Out Screen’s blue display is a free online tool that fills your monitor with a pure blue background. Used for subpixel testing, cool ambient lighting, photography backdrops and colour accuracy testing — no download or signup required.

White Black Red Green Blue Yellow Orange Pink Purple

F or Space — Fullscreen

ESC — Exit fullscreen

← → — Cycle colors

R — Reset color

What people use it for

🖥️ Subpixel Testing

Blue screens reveal red and green subpixel defects as discoloured spots that are invisible on white or mixed colour backgrounds.

💡 Cool Ambient Lighting

Creates a calm blue-toned light for gaming setups, streaming backgrounds or atmospheric room lighting.

📸 Photography Backdrop

Clean blue background for product shots, portraits or creative photography requiring a cool-toned backdrop.

🎨 Colour Accuracy Testing

Tests your display’s ability to reproduce accurate blue tones — essential for designers and photographers doing colour-critical work.

🧘 Calming Environment

Blue light is associated with calm and focus, making it useful for meditation spaces or focused work sessions.

Screensavers

📀

DVD Screensaver

Pro tips

Use Yellow screen for comfortable late-night reading — warmer and less disruptive than white.
Press F or click the screen to launch true fullscreen mode instantly.
Use Red screen to preserve night vision while stargazing — red light is least disruptive to dark adaptation.
Use Green screen as a chroma key background for webcam effects in video calls.
Adjust the Lightness slider to dial in the exact brightness you need without touching your system settings.
Download any color at up to 8K resolution as a PNG — great for design mockups or wallpapers.

Frequently asked questions

What is a blue screen online tool used for?

A blue screen online tool displays a pure fullscreen blue background used for subpixel testing, cool ambient lighting, photography backdrops and colour accuracy testing. It is completely free with no download required.

How do I test subpixels using a blue screen?

Display a fullscreen blue background and look for any red, green or dark spots. These indicate dead or stuck subpixels in the red or green channels that are invisible on white screens.

Can I use a blue screen as a photography backdrop?

Yes. A fullscreen blue display provides a clean, evenly lit backdrop for product photography, portraits or creative shots. Use the lightness slider to adjust the intensity to match your desired tone.

Is blue light bad for sleep?

Blue light suppresses melatonin production more than other colours, making it the most disruptive for sleep. For late night use switch to yellow, orange or red screens which are significantly less disruptive.

Is the blue screen tool free?

Completely free. No signup, no ads, no tracking. Open it in your browser and it works instantly.