Free Screen & Dead Pixel Test
Find dead, stuck and defective pixels on your screen in seconds.
Test your iPhone, Android, Mac, Windows PC, laptop, monitor, tablet or TV display with pure full-screen color diagnostics. Zero downloads, no account, 100% private.
What device are you testing?
Select your device type for custom display preparation instructions and pre-configured test sequences.
iPhone & iPad
Inspect Super Retina XDR OLED & Liquid Retina LCDs for stuck subpixels and notch uniformity.
Android Devices
Test Samsung, Google Pixel, and Xiaomi screens for subpixel burn-in, green lines, and dead clusters.
Mac & Displays
Check MacBook Pro Liquid Retina XDR, iMac, and external 4K/5K displays for uniform calibration.
Windows PC & Monitors
Inspect gaming monitors, laptops, and ultra-wide panels for IPS glow, backlight bleed, and dead dots.
Open your browser on the display and launch the universal test sequence.
Choose Your Test
Pick a specialized diagnostic routine or launch the comprehensive full-screen sequence.
Dead Pixel Test
Identify inactive or permanently dark pixels that remain black against pure white and light backgrounds.
Stuck Pixel Test
Find pixels stuck on a particular subpixel color (red, green, blue) against pure black and dark backgrounds.
Screen Color Test
Display pure RGB and CMY solid color fields to verify individual subpixel channel health and color balance.
Screen Uniformity
Inspect the display for uneven backlight distribution, IPS glow, corner vignetting, and dirty screen effect (DSE).
Gradient & Banding
Inspect smooth luminance and chrominance transitions to check for harsh color stepping or 8-bit banding.
Complete Display Test
Run the full diagnostic sequence covering all solid colors and high-precision gradients.
How to Prepare Your Display
Follow these 6 simple steps before starting your test for the most accurate visual diagnostic results.
Clean Display Surface
Gently wipe away smudges, fingerprints, and dust specks with a dry microfiber cloth so surface dust isn't mistaken for a defective pixel.
Maximize Brightness
Turn display brightness up to 80–100%. High brightness illuminates all subpixel channels to make tiny anomalies easily noticeable.
Turn Off Night Mode & True Tone
Temporarily disable Night Shift, Night Light, True Tone, or Eye Comfort Shield to inspect true, unshifted sRGB color values.
View Directly at 90° Angle
Position your eyes directly in front of the screen. Looking from steep side angles causes natural gamma and contrast shift on LCD panels.
Trigger Fullscreen Mode
Press 'F' or tap the Fullscreen button to hide browser address bars, OS taskbars, and bookmarks for total immersion.
Inspect Each Color Field
Take 2 to 5 seconds on each color canvas. Pay extra attention to high-density zones, status bar areas, and display corners.
Pro Tip: Conduct tests in a dimly lit or dark room when inspecting black and dark gray screens. This makes subtle backlight bleed, IPS glow, and bright stuck subpixels instantly jump out.
Dead Pixel vs. Stuck Pixel: What’s the Difference?
Not all screen blemishes are the same. Understanding pixel defects helps you evaluate warranty eligibility.
What is a Dead Pixel?
A dead pixel occurs when the electrical transistor powering the pixel completely fails. With no current flowing, the pixel remains permanently off, appearing as a dark or black speck against bright backgrounds.
Live Display Inspector
Instant browser environment readouts for your current display configuration.
Current Display Metrics
Detected live from browser DOM & Screen APIs
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Live rendering area1.0 DPR
Standard 1xLandscape
Viewport layout24-bit
Standard sRGB/D65Supported Display Technologies
PixelCheck365 operates with pure hardware-direct color rendering, compatible with every modern panel type.
OLED & QD-OLED
Tests for stuck lit subpixels, OLED burn-in retention, and near-black grayscale uniformity without backlight bleed.
IPS & Fast-IPS
Evaluates corner IPS glow, edge backlight bleed, dead pixel specks, and horizontal viewing angle consistency.
Mini-LED & FALD
Inspects zone blooming around bright elements against black backgrounds, and checks local dimming transitions.
VA & Curved Panels
Checks for black level uniformity, gamma shifts along curve radii, and fast subpixel response transitions.
Apple Retina & Studio
Inspects ultra-dense pixel matrices where individual defective subpixels are microscopic and require magnification.
4K & 8K Smart TVs
Tests large-format screens for dirty screen effect (DSE), dead pixel clusters, and vertical banding.
Everything You Need to Know
Clear answers about display testing, subpixel defects, device diagnostics, and manufacturer policies.
Ready to Check Your Screen?
Launch full-screen diagnostics right now to verify pixel health, backlight uniformity, and color fidelity across your entire display.