Free White Screen Test
A free white screen test: pure white fullscreen to spot dead pixels and dust.
Your Screen Info
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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 white screen test?
A white screen test turns every pixel on your display to full white (#FFFFFF). Because each red, green and blue subpixel is at full power, any pixel that does not light up shows as a black dot.
Use this test to find dead pixels, dust trapped under the panel, yellow or pink tints and darker patches. A full white screen also works as a simple light source, for example for video calls or to check a document against light.
How to run the test
1
Clean the screen
Wipe away dust and fingerprints first so you do not mistake them for faults.
2
Start the test
Click the Start button or press F to fill the screen with white.
3
Check every area
Look at the corners and edges as well as the centre. Press Esc or tap × to exit.
How to read your results
Black dot
A black dot on white is a dead pixel. It does not light at all.
Coloured dot
A red, green or blue dot is a stuck subpixel. Check it on the black screen too.
Gray or darker patches
Uneven brightness or a cloudy look is poor uniformity or dirty screen effect.
Yellow or pink areas
A tint in one area usually comes from the backlight or the panel coating.
Related tests
Dead Pixel Test
9 colours to find dead and stuck pixels
Black Screen Test
Pure black for hot pixels and light leaks
Greyscale Test
Grey ramps and steps for tint and lost shades
Contrast Test
Black level, white level and sharp patterns
Monitor Screen Test
Check a new or used monitor
Laptop Screen Test
Check a laptop display
Frequently asked questions
What does this test find?
Dead pixels, stuck subpixels, dust under the panel, tints and uneven brightness.
Is a white screen bad for my display?
No. A white screen for a few minutes is safe for LCD and OLED screens. Avoid leaving any static image on an OLED screen for hours.
Can I use a white screen as a light?
Yes. At full brightness a white screen gives soft, even light, for example on video calls.
How do I leave the white screen?
Press Esc, or tap the × button in the corner on a touch screen.