Full-Screen Solid Colors
Display pure black, white, red, green, blue, gray, magenta, cyan, and yellow across your entire screen — the gold standard for dead pixel detection.
Dead Pixel Test
Full-Screen Color Checker
Cycle through full-screen solid colors — black, white, red, green, blue, gray, and more — to instantly spot dead or stuck pixels on your phone, tablet, or monitor. No app, no download, 100% private.
Ready to test
Black
Tap "Start Full-Screen Test" for the real check
Select a Color
3s
Features
Why Use This Dead Pixel Test?
Everything you need to confidently check any screen for pixel defects.
Tap, Swipe & Arrow Keys
Navigate colors however you like — tap or swipe on mobile, use arrow keys on desktop, or tap the left/right edges to jump between colors.
Auto-Cycle Mode
Enable auto-cycle to automatically rotate through all colors at your chosen speed — great for pixel refresh or unattended testing.
Phone-Optimized
The full-screen test hides browser chrome, supports touch gestures, and includes step-by-step guidance for disabling True Tone, Night Mode, and adjusting brightness.
100% Private
Everything runs locally in your browser. No data is transmitted, no cookies, no tracking — just a pure, private pixel test.
Universal Compatibility
Works on any device with a modern browser — iPhone, iPad, Android phones and tablets, Windows, Mac, Linux, and smart TVs.
How It Works
Test Your Screen in 4 Steps
Finding dead pixels has never been easier — no app, no sign-up, no nonsense.
Set Up
Max brightness, disable True Tone and Night Mode, and close other apps to reduce glare and color shifts.
Start Test
Tap "Start Full-Screen Test" to enter full-screen mode. The browser chrome disappears, giving you a pure color field.
Cycle Colors
Swipe, tap, or use arrow keys to move through black, white, red, green, blue, gray, and more. Inspect each color carefully.
Spot Defects
Look for tiny black dots (dead pixels) or colored dots (stuck pixels). Exit with Esc or the close button.
FAQ
Dead Pixel Test — Common Questions
Everything you need to know about dead pixels, stuck pixels, and how to test for them.
Open this dead pixel test page, tap "Start Full-Screen Test", and cycle through the full-screen solid colors. Look closely at each color — dead pixels appear as black dots on bright colors, while stuck pixels stay a single color on every screen. Use the arrow keys or tap/swipe to advance through colors.
A dead pixel stays completely black on every color because it receives no power. A stuck pixel remains permanently lit in one color (red, green, or blue) regardless of what the screen should display. This dead pixel test helps you spot both by showing pure solid colors that make any anomaly stand out.
Dead pixels (black) are usually permanent hardware failures, but stuck pixels (colored) can sometimes be revived by rapidly flashing colors over them for several minutes — a technique known as pixel fixing. Some monitors and phones include a built-in pixel refresh feature. If the pixel is truly dead, a screen replacement may be needed.
True Tone and Night Mode alter the color temperature and brightness of your display, which can mask subtle pixel defects or make colors appear inaccurate. For a reliable dead pixel test, disable both features and set brightness to maximum so the colors are shown as pure as possible.