How this tool works
The backdrop is a solid CSS color: #ffffff for white, with six other choices in the swatches. A large white area near your camera can add fill light; paper or a film negative held in front of it can be easier to see through. For a screen check, look for dark dots or patches, then compare them on other colors before treating them as a pixel fault. Dust on the surface can look like a dark pixel.
Choose a swatch or press Go full-screen white. The page requests fullscreen through the browser's Fullscreen API. If that is unavailable or refused, the color covers only the browser viewport, so browser controls may remain visible. Tap or click the field to advance a color; the Left and Right arrow keys go backward and forward. The ✕ button and Esc close the field. Moving the pointer brings faded controls back; tapping does too, but also advances the color.
The readout lists the selected color, fullscreen state, and screen and viewport sizes reported by the browser. The sizes use CSS pixels, which can differ from the panel's native pixel count. This information is read locally, without being stored or sent anywhere. It is not a brightness or color-accuracy measurement: display settings, color processing and automatic brightness limits still affect the result. The page does not flash the field, but a camera may still pick up flicker from the display itself.
Frequently asked questions
Can this page make my screen brighter?
It can put a larger bright area on screen, but it cannot change your device's brightness setting. Use the device's controls if you need more light. The white value, #ffffff, is a color request, not a command for maximum light output; the display may limit brightness, especially across a large white area.
How do I use the white screen as a light for video calls?
Use a second screen near the camera so the white field does not cover your call window. Check the camera preview, then adjust that screen's position and brightness until it adds useful light without glare. A warmer or cooler display setting changes the light's tint, and the camera's exposure and white balance affect how it looks in the call.
Will a solid white screen damage my display or cause burn-in?
Keep sessions brief and follow your display manufacturer's care guidance. Long periods showing the same image can contribute to image retention or wear, particularly on OLED, so do not leave the white screen running overnight or use it as a screensaver. Use only as much brightness as you need, and close the field when you are finished.
Why does the white look slightly blue, yellow, or pink?
The white backdrop uses #ffffff. A blue, yellow or pink tint can come from night-light filters, color profiles, monitor presets or the panel itself. Check night mode and the monitor's color preset first. Comparing two screens under the same room lighting can make a difference easier to see, but it does not show which one is more accurate.
How do I get out of full screen?
Tap or click the ✕ button, or press Esc. If the button has faded, move the pointer to reveal it without changing color; on touchscreens, tap the field to bring it back and advance to the next color. Left and Right arrow keys also step through the colors. When browser fullscreen is active, its own exit control or gesture closes the field too.
