Sleep & Ambient
A full black screen gives you a dark room without glare. Popular for night rooms, meditation, and focus sessions.
One Click. Full Black Screen.
A pure black full screen, free in your browser. Sleep mode, OLED saver, presentation mode and a dead pixel test, all in one click.
Auto-exit
Go black, let your eyes adjust for a few seconds, then scan the whole screen. Bright dots on black are stuck pixels. Switch to white to find dead pixels, which show as dark dots.
Screen resolution—
Viewport—
Pixel ratio—
Refresh rate (estimated)Measuring…
- Runs in your browser
- Nothing uploaded
- 100% free
- Works on phones
Every color, full screen
Each color has its own page with the same one-click full screen and controls.
White ScreenCheck for dust and smudgesRed ScreenNight-friendly dim lightGreen ScreenChroma key backdropBlue ScreenBlue channel and uniformityYellow ScreenWarm fill light for videoOrange ScreenLow-blue ambient glowPurple ScreenMood and stage lightingPink ScreenSoft selfie fill lightGray ScreenUniformity and dirty screen check
What people use it for
OLED & Battery
On OLED screens black pixels are switched off, so a black screen uses less power.
Gamers & Creators
Check uniformity, ghosting, and banding before competitive gaming or editing.
Photo & Video Backdrops
Use a solid black or white screen as a clean backdrop or light source.
Complete Screen Test Suite
Professional tools to check every part of your display
Dead Pixel TestCycle solid colors to spot dead and stuck pixels.Run TestFlashingStuck Pixel FixerRapidly cycles colors on a small area to try to revive a stuck pixel.Run TestBacklight Bleed TestA dark screen shows light leaking at the edges.Run TestContrast & Brightness TestNear-black and near-white steps to tune settings.Run TestRefresh Rate TestMeasure the frame rate your browser draws at.Run TestFlashingGhosting & Response Time TestMoving targets reveal trails and smearing.Run TestFlashingScreen Flicker TestPatterns that help you notice visible flicker.Run TestGreyscale & Banding TestSmooth gradients reveal banding and uneven greys.Run TestOLED Burn-in TestSolid colors and grids to spot image retention.Run TestScreen Resolution CheckerSee resolution, viewport and pixel ratio.Run TestTouch Screen TestDraw across the screen to find dead touch zones.Run TestMonitor TestRun every test in sequence from one launcher.Run Test
How to Test for Dead Pixels
- 1
Click Go Fullscreen on a black screen.
- 2
Let your eyes adjust for 5 seconds.
- 3
Scan the whole screen slowly and note any bright dots (stuck or hot pixels).
- 4
Switch to white and look for dark dots (dead pixels).
- 5
Repeat with red, green, and blue.
Found one? Try the Stuck Pixel Fixer and check your warranty. Do not press on the screen, it can cause damage.
Dead pixel
No power reaches the pixel, so it stays dark. Easiest to see on a white screen. Usually permanent.
Stuck pixel
The pixel stays lit in one color (red, green, blue, or white). Easiest to see on a black screen. Sometimes fixable.
Guides
Monitor GuidesBest Monitor Settings for Gaming, Photo Editing, and Office WorkMost monitors ship with factory settings that are designed to look impressive in a brightly lit showroom — not to be accurate, comfortable, or…
Monitor GuidesHow Many Dead Pixels Are Normal? Monitor Warranty Policies ExplainedYou just ran a dead pixel test and found one — or two — dark dots on your brand-new monitor. Are you entitled to…
Display TechnologyIPS vs VA vs TN Monitor: Which Panel Type Is Right for You?Choosing a monitor is one of the most impactful hardware decisions a PC user makes — and the panel technology inside the display has…
Screen TestsWhite Screen Test: What a Pure White Screen Reveals About Your DisplayA pure white screen might look simple, but it is one of the most revealing display tests available. A full white screen pushes every… Monitor picks
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Frequently asked questions
What is a black screen used for?
People use a black screen to sleep in a dark room, save battery on OLED phones, hide their desktop during a presentation, as a backdrop for photos and video, and to check a monitor for stuck pixels and backlight bleed.
Is it free to use?
Yes, 100% free. No sign-up, no download, no limits.
Does it work on phones and TVs?
Yes, on any device with a modern browser. iPhone Safari has no fullscreen mode, so the page uses a full-viewport view instead.
Will a black screen damage my monitor?
No. A black screen is a normal image. On OLED screens the black pixels are switched off, which also uses less power.
Does a black screen save battery?
On OLED and AMOLED displays, black pixels are switched off, so a black screen uses less power. On LCD screens the backlight stays on, so the savings are minimal.
How do I stop my screen from turning off?
Turn on Keep Screen Awake. It uses your browser's Wake Lock feature, which is not supported in every browser.
Is it safe to leave a bright or colored screen on for hours?
A static bright image shown for many hours can cause temporary image retention on some OLED screens. Use the auto-exit timer and take breaks.
How many dead pixels are acceptable on a new monitor?
Policies vary by brand and model, so check your warranty terms. Some manufacturers allow a small number, others replace a screen for a single dead pixel.