Frequently asked questions
What does SOS look like in Morse code?
Three short flashes, three long flashes, then three short flashes (··· ––– ···), repeated with a pause between rounds.
Can I flash my own message?
Yes. Use the Morse code flashlight to type any message and flash it.
More free screen lights and tools
Strobe & party
- Online Strobe LightTurn any screen into a flashing strobe light.
- Police LightsAlternating red and blue flashers with the classic double-flash pattern.
- Online Disco LightTurn your screen into a dance floor.
- Rainbow Color Changing LightYour screen glides through every color of the rainbow.
SOS & signals
- Morse Code FlashlightType a message and your screen flashes it in Morse code.
Light modes
- Online Ring LightA soft ring of light for selfies, makeup and video calls.
- Video Call LightLook better on Zoom, Teams and Meet.
- Red Night LightDeep red light that does not ruin your night vision.
- Scrolling LED Text SignType a message and show it huge on your screen as scrolling LED text.
Relax
- Online Candle LightA warm, flickering candle glow with no flame and no smoke.
- Sunrise Wake-Up LightThe screen starts dark and slowly brightens like a sunrise over the time you choose.
- Online Lava LampWarm glowing blobs drift slowly across your screen like a retro lava lamp.
Color screens
- Dead Pixel TestFill your screen with solid colors to spot dead (always black) or stuck (always one color) pixels.
- White ScreenA pure white full screen (#FFFFFF) for lighting, cleaning your monitor, checking pixels or as a light box for tracing.
- Black ScreenA pure black full screen (#000000) to blank your display, save OLED battery, hide your screen or spot backlight bleed.
- Red ScreenA solid red full screen (#FF0000) for pixel testing, red mood lighting and night-vision friendly light.
- Blue ScreenA solid blue full screen (#0000FF) for pixel testing, chroma backgrounds and cool mood lighting.
- Green ScreenA solid green full screen (#00FF00) for pixel testing and a quick chroma-key background.
- Yellow ScreenA solid yellow full screen (#FFFF00), a warmer, softer alternative to white light.
- Orange ScreenA solid orange full screen (#FF8000) for warm, cozy light and pixel testing.
- Pink ScreenA solid pink full screen (#FF69B4) for flattering selfie light and mood lighting.
- Purple ScreenA solid purple full screen (#8000FF) for party and mood lighting.
- Gray ScreenA neutral 50% gray full screen (#808080) to check for uniformity, banding and dirty-screen effect.
Pranks
- Fake Blue Screen of DeathThe classic Windows XP "blue screen of death" crash, ready for an office or classroom prank.
- Fake Windows 10 Blue ScreenThe modern Windows crash screen with the sad face :( and a slowly rising "% complete" counter.
- Cracked Screen PrankMake it look like your screen is shattered.
- Hacker Screen SimulatorA green terminal that types endless "hacking" commands by itself.
- Fake Windows Update Screen"Working on updates… Don't turn off your computer." The percentage rises as slowly as you like.
- Fake Mac-Style Update ScreenA clean black installer screen with a progress bar and a "minutes remaining" countdown that you control.
- Radar ScreenA green radar sweep with fading blips.
Screensavers
- Bouncing DVD ScreensaverThe legendary bouncing DVD logo.
- Online Flip ClockA big, easy-to-read flip-style clock in your local time.
- Matrix Rain ScreensaverFalling green code straight out of the movies.
- No Signal Color BarsThe classic TV test pattern with a "NO SIGNAL" box.
- Motivational Quote ScreensaverInspiring quotes that fade in and out every few seconds.