Free Black Screen Test
A free black screen test: open pure black fullscreen in one click.
Your Screen Info
Detected in your browser
Colour screens
Tap a colour to test it fullscreen
Custom colour
Custom colour
Shortcuts
- F Fullscreen
- → Next screen
- ← Previous
- Esc Exit
On a phone or tablet, tap to go to the next screen.
What is a black screen test?
A black screen test fills your whole display with pure black (#000000). On a perfect screen nothing lights up. Anything you can see, such as a bright dot, a coloured speck or a glow at the edges, is a fault or a limit of the panel.
This test is the quickest way to find hot and stuck pixels, check for backlight bleed or IPS glow on LCD monitors, and confirm that an OLED screen turns its pixels fully off. You can also use a pure black screen to clean your display, since dust and smudges are easier to see on it.
How to run the test
1
Dim the room
Turn off the lights or close the curtains so small leaks of light are easy to see.
2
Start the test
Click the Start button or press F. The page goes fullscreen in pure black.
3
Look closely, then exit
Scan the screen from edge to edge. Press Esc or tap × to leave fullscreen.
How to read your results
Bright or coloured dot
A dot that stays lit on black is a hot or stuck pixel. Note where it is and check it again on the white and red screens.
Glow at the edges or corners
Patches of light along the edges are backlight bleed. Some bleed is normal on LCD screens; large bright patches are not.
Glow that moves with your head
If the glow changes when you move, it is IPS glow, a normal trait of IPS panels, not a defect.
Completely black
On an OLED screen the whole panel should look switched off. On LCD a faint even gray is normal.
Related tests
Backlight Bleed Test
Spot light leaking at the edges
OLED Screen Test
Burn-in, image retention and dark gray
Dead Pixel Test
9 colours to find dead and stuck pixels
Contrast Test
Black level, white level and sharp patterns
LCD Screen Test
Bleed, evenness and pixels on LCD
TV Screen Test
Check a TV in its browser
Frequently asked questions
Is this test free?
Yes. It runs in your browser, needs no app or sign-up, and nothing is uploaded.
Does a black screen save battery?
On OLED and AMOLED screens black pixels are switched off, so a black screen uses very little power. On LCD screens the backlight stays on, so it saves almost nothing.
Can I use a black screen to clean my display?
Yes. Dust, fingerprints and streaks show up clearly on black, so it is a handy guide while you wipe the screen.
How do I exit the black screen?
Press Esc on a keyboard, or tap the × button in the top right corner on a phone or tablet.