Solid Full-Screen Colors
Open pure white, black, purple or all 8 colors edge to edge. One tap fills the whole display — no app, no sign-up.
Full Screen Color & Display Test
Tap any color to fill your screen instantly. Test for dead pixels, stuck pixels, backlight bleed and lines on any phone, laptop, monitor or TV — free, in your browser, no install.
Click a color → full screen · switch with ← → · exit with Esc or a tap
Screen Self-Check
A line on your screen? Diagnose lines, dead pixels and color faults with guided tests for phones, laptops and monitors.
Backlight Bleed
See light leaking from the edges in a dark room? Run the 30-second black-screen bleed test and learn what is normal for IPS panels.
Fake Broken Screen
A full-screen cracked-glass prank you can trigger in one tap — harmless, lightweight and convincing from across the room.
What each full-screen color reveals
Every solid color stresses a different part of the panel. Testing with a single color misses defects, so work through all of them — it takes less than a minute.
| Screen color | What it helps you find |
|---|---|
| White | Dead (black) pixels, dust, smudges, uneven brightness, yellow or pink tints |
| Black | Stuck (bright) pixels, backlight bleed, IPS glow, edge light leaks |
| Red / Green / Blue | Stuck pixels and dead sub-pixels that only show on one channel |
| Yellow / Cyan | Color uniformity faults and tinted patches across the panel |
| Purple | Uniformity and tint checks on OLED and wide-gamut displays |
How to test your screen in 30 seconds
- 1
Clean the screen
Wipe the display with a dry microfiber cloth first, so dust is not mistaken for dead pixels.
- 2
Pick a color
Start with white, then switch to black, red, green and blue. Each color reveals a different defect.
- 3
Go full screen
Tap any color block above. Press Esc (or tap) to exit; use ← → to switch colors while testing.
- 4
Inspect closely
Scan every corner at normal distance, then up close. Any dot or line that refuses to change is a defect.
- 5
Check the edges
On black, look for light leaking around the borders — that is backlight bleed.
- 6
Note and compare
Photograph anything suspicious and compare against our guides before deciding on a repair or return.
Dead pixel, stuck pixel or dust?
- Dead pixel — stays black on every color, easiest to see on the white screen. It is a permanent hardware fault.
- Stuck pixel — stays red, green, blue or white while the rest of the screen changes, easiest to see on the black screen. Sometimes recovers by itself.
- Dust or smudge — looks blurry, moves when you wipe the screen and changes appearance at an angle. Clean and test again before assuming the worst.
Found a defect? Check the manufacturer's pixel policy — most brands specify how many defective pixels qualify for a warranty replacement, so photograph each one. If you see lines instead of dots, start with the lines-on-screen diagnosis; for glow at the edges, run the backlight bleed test.
White Screen Test FAQ
What is a white screen test?+
It fills your entire display with pure white so every pixel shows the same color. Dead pixels, dust, smudges, uneven brightness and color tints become easy to spot against the uniform background.
How do I test my screen for dead pixels?+
Open the white full screen and look for black dots, then switch to black and look for bright dots, then cycle red, green and blue. A dead pixel stays black on every color; a stuck pixel stays colored while everything else changes.
Does the white screen test work on phones and TVs?+
Yes. The tool runs in any modern browser — Android, iPhone, iPad, Windows, Mac, Chromebook and smart TVs. On devices without fullscreen support the color still fills the whole viewport.
Is this free? Do I need to install anything?+
It is completely free and runs entirely in your browser. There is nothing to install and no account to create. Colors are generated locally on your device.
Can a white screen fix a stuck pixel?+
No. Full-screen colors help you find defects, not repair them. Dead pixels are permanent hardware faults; stuck pixels occasionally recover on their own after the panel warms up.