This flashes bright colors very fast. Don’t use it if you are sensitive to flashing light.
Clear image retention
This can fade temporary image retention, but it can’t fix permanent burn-in. Noise flickers fast, so skip it if flashing light affects you.
Screen light
Start test tones at a low volume, especially with headphones, and skip the pixel fixer and the noise pattern if flashing light affects you. These tests check your devices, not your hearing or eyesight.
Turn your screen into a soft light: warm (about 3000 K), neutral (about 4500 K), daylight or cool white, with adjustable brightness. In full screen, drag up or down to change brightness and sideways to change the color. The screen stays on.
How to use
- Tap the big preview or a color to fill the whole screen. Tap, swipe or press → / ← to step through white, black, red, green, blue and three grays.
- Look for faint shapes that stay visible on every color (burn-in or image retention) and for light leaking at the edges on black (backlight bleed).
- To fade temporary retention, pick Moving bars, Noise or Color cycle and a duration, then press Start. The timer ends the exercise on its own.
- Screen light: pick a color and brightness, then turn on the light. In full screen, drag up or down (or press ↑ / ↓) to change brightness and swipe sideways to change the color.
- Image retention is a temporary after-image that usually fades by itself. Burn-in on OLED and plasma screens is permanent wear that no pattern can undo.
- Run the exercise at normal brightness and stop if the screen gets hot. Noise flickers fast, so skip it if flashing light affects you.
- The cursor is hidden and the page asks the browser to keep the screen on while a full-screen view is open. Battery saver modes may still dim the screen.
Burn-in versus image retention
Image retention is a temporary after-image, often of a static logo, taskbar or game HUD, that fades on its own after minutes or hours of varied content. Burn-in is permanent, uneven wear of OLED or plasma pixels that have shown the same bright image for a long time; no pattern can undo it. On LCDs, ghosting is almost always temporary.
To check, show each solid color full screen and look for faint shapes that stay in the same place on every color. Mid gray (50%) and solid red or blue show OLED burn-in most clearly. Check at normal brightness, and in a dim room for black.
Fading retention and using the screen as a light
Moving color bars, noise or a slow color cycle exercise every pixel evenly for 10, 30 or 60 minutes or until you stop. Many TVs and monitors also have a built-in pixel refresh that does a deeper job; run it from the menu if you see lasting marks. The screen light gives a warm, neutral, daylight or cool white at adjustable brightness for video calls, makeup or reading, with the screen kept on.
Frequently asked questions
How do I test my screen for burn-in?
Show solid gray, red, green and blue full screen and look for faint images that stay in the same spot on every color, such as a logo or taskbar.
Can burn-in be fixed?
Temporary image retention usually fades with varied content or a refresh pattern. True burn-in on OLED or plasma is permanent wear and cannot be repaired.
How long should I run the burn-in fixer?
Start with 10 to 30 minutes at normal brightness. If marks remain, try the TV's own pixel refresh; stop if the screen gets hot.
Why use a white screen?
A full white screen shows dust, dead pixels and uneven backlight, and works as a light source for video calls or tracing paper.
Does the screen stay on?
Yes, the page asks the browser to keep the screen awake while a full-screen view is open and hides the cursor. Battery saver may still dim it.