Dead Pixel Test - Free Online Screen Checker for Any Display
Run a professional dead pixel test online for any monitor, laptop, phone or tablet. Detect dead, stuck and hot pixels with fullscreen solid colors, gradients and patterns, then check gamma, contrast and backlight uniformity in one place.
Free Online Dead Pixel Test - Full Screen
Click any tile below to launch a fullscreen test. Use → / Space to advance, P for auto-play, I for display info, Esc to exit.
Solid Color Test
Check for dead pixels, bright spots, and color uniformity
Gradient Test
Check for banding, gamma, and smooth transitions
Pattern Test
Check geometry, sharpness, and pixel alignment
Brightness & Gamma
Check the gray ramp, posterization, and shadow / highlight detail
Contrast Test
Check full black/white swing and fine 1px transitions
Backlight Uniformity
Check clouding, backlight bleed, vignette, and IPS glow
Sharpness / Text
Check text clarity, color fringing, and scaling
Motion / Ghosting
Check pixel response time and motion blur
Flicker / Strobe
Check flicker and refresh-rate artifacts
More screen tools
Free browser-based utilities for testing, lighting and creating screen backgrounds.
Color Screen
Open any solid color full screen or download it as an image.
Screen Light
Turn your display into an adjustable warm or cool light source.
Gradient Generator
Build, preview and export smooth two-color backgrounds.
Screen Information
Inspect resolution, pixel density, viewport and display capabilities.
How to check your screen for dead pixels
You don't need any software or an app. Follow these five steps in your browser to inspect any monitor, laptop, phone or tablet for dead, stuck and hot pixels. Read the full guide on how to check for dead pixels.)
- 1
Clean the screen and dim the room
Wipe the panel with a soft microfiber cloth so dust isn't mistaken for a dead pixel, then dim nearby lights to reduce glare.
- 2
Launch a fullscreen test color
Click any tile above and the screen switches to true fullscreen, with no browser bars hiding a single pixel.
- 3
Cycle through white, black, red, green and blue
White reveals black dead pixels; black shows hot and stuck pixels; pure RGB isolates a single stuck sub-pixel.
- 4
Scan slowly, corner to corner
Give each color 30-60 seconds and sweep your eyes across the panel in rows. Any dot that stays a different color is a suspect pixel.
- 5
Confirm it isn't dust, then document it
Take a screenshot. If the dot is gone, it is a hardware defect, not software. Photograph it for a warranty claim and try the Stuck pixel fixer before returning the screen.
Test more than dead pixels: gamma, contrast and uniformity
From dead pixels to motion blur, the free tester covers display defects on any screen with no app, upload or cost.
What is a dead pixel test?
A dead pixel test is a quick visual check for broken sub-pixels on LCD, LED, OLED, IPS, VA or AMOLED displays. Pure colors, gradients and stress patterns make dead, stuck and hot pixels easier to see.
Test any screen: monitor, laptop, phone and OLED
Run a checker before the return window closes. The fullscreen colors help document defects on a new monitor, used MacBook or refurbished phone for a return or warranty claim.
Rapidly cycling red, green and blue for 20-30 minutes can also help some stuck sub-pixels recover.
Dead pixel vs stuck pixel vs hot pixel
Receives no power and stays black on every background. Easiest to spot on white or gray.
One red, green or blue channel stays on as a bright colored dot on black. It is sometimes fixable.
A sub-pixel that always shines white and is most obvious on a pure-black screen.
Why use a browser-based dead pixel checker
True fullscreen
The Fullscreen API removes browser bars so no part of the panel is hidden.
45+ test screens
Solid colors, gradients, gamma, contrast, uniformity, text, motion and flicker patterns.
Private and free
Nothing is uploaded. The tester runs entirely in your browser and stays free.
Beyond dead pixels: color, gamma and uniformity
Modern displays may have subtle backlight bleed, gray tint or gradient banding. Gamma, contrast, uniformity, text and motion tests reveal issues that solid colors miss and provide a practical display health check.
Dead pixel test FAQ
What you need to know about checking a screen for dead pixels and other display defects.
What is the difference between a dead, stuck and hot pixel?
A dead pixel stays completely black on every color (it receives no power). A stuck pixel is bright in one color - red, green or blue - on a black background. A hot pixel is always pure white. Our solid-color screens reveal all three.
How do I run the screen test?
Clean your screen, dim the room lights, click any tile to enter fullscreen, then use the arrow keys or Space to cycle through the screens. Press P for auto-play, I to show your display info, and Esc to exit.
Does it work on phones, tablets and 4K monitors?
Yes. The tester is fully responsive and runs in any modern browser on iOS, Android, iPadOS, Windows, macOS and Linux, at any resolution from 720p up to 8K.
Can the tests fix a stuck pixel?
Sometimes. Rapidly cycling between pure red, green and blue for 20-30 minutes can revive a stuck sub-pixel, especially combined with gentle pressure through a soft cloth. Dead pixels usually need hardware replacement.
What are the gamma, contrast and uniformity tests for?
They catch problems solid colors miss: the gamma ramp shows crushed shadow and highlight detail, the contrast test checks full black/white swing and 1px edges, and the uniformity screens reveal backlight bleed, clouding and vignette.
Is the tool free, and is anything uploaded?
It's 100% free with no signup or download, and nothing is ever uploaded - every test runs entirely in your browser.