CHECK DEAD PIXELS

USER GUIDE
You can click here for PC / Desktop
Mobile Ghosting
TV Pixel Test
Solid Colors
Dead pixel detection
Gradients
Banding & uniformity
Convergence
Alignment grid
NEW
Noise
Stuck subpixel
NEW
Gamma
Gray tone calibration
NEW
Sharpness
Focus & resolution
NEW
Color Blind Mode
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Client-Side
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Professional Screen Test Tools
All tests run locally. Your data stays on your device and never reaches our servers. 100% private and secure.
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All test code is original client-side JavaScript. Fonts (Press Start 2P, Inter, JetBrains Mono) are licensed under the SIL Open Font License (OFL).
Important Warning — Please Read
Photosensitivity / Epilepsy Warning: This tool contains intense color changes (Red, Green, Blue, Black, White or Yellow, Neutral Gray, etc.) at high brightness in full screen size. If you have photosensitive epilepsy, sensitivity to visual triggers, or conditions caused by color sensitivity, please do not use this tool. All individuals using the test agree that they use this tool entirely by their own choice. By starting the test, you accept in advance that the developers (Check Dead Pixels Team) hold no legal responsibility for any medical reaction or hardware damage, and all responsibility belongs to you.

Cookies & Data Usage: This site has no server; all tests run on your device. Only limited cookies are used for the most basic anonymous visitor statistics, such as page view counts. No personal data is collected or stored.

iOS & Android Tips

iOS: Scroll down to hide the Safari address bar for the largest test area. True native fullscreen is not available on iOS browsers.
Android: Tap "Start Test" — the browser will enter fullscreen, but the address bar may reappear on swipe.

FAQ — Frequently Asked Questions

A dead pixel is a display defect where a single point remains black (dead), white (hot), or stuck on one color. Use full-screen solid colors (black, white, red, green, blue) to easily spot them.
Completely free. No personal data, IP address, or hardware information is saved on our servers. It runs entirely in your browser with zero cookies.
Red-green color blind users may not distinguish pure red/green. This mode uses cyan, bright purple, custom yellow, and pure blue tones so everyone can test their hardware effectively.
On PC use Space/arrow keys to change colors. On mobile swipe the screen. On Smart TV open in browser and use remote arrow keys. All devices are supported.
Yes, the Noise/Grain test uses rapid color changes and animations that can help unstuck subpixels. For permanent hardware defects, contact an authorized service center.
Solid Colors: dead pixels & burn-in.
Gradients: banding & uniformity.
Convergence: pixel alignment & geometry.
Noise: stuck pixel repair.
Gamma: gray tone calibration.
Sharpness: focus & resolution.
Use the Solid Color test with full-screen gray tones. If a ghost image of fixed menu bars or logos appears on the gray background, your screen has burn-in. On OLED displays this may be permanent.
On LCD panels a defective pixel usually appears permanently black or white. On OLED panels a pixel may be completely off (black) or remain colored. The solid color test clearly shows the defect on both panel types.
No. The test only uses the screen's color-producing function; it creates no physical pressure or extra heat load on pixels. The rapid color changes in the Noise test are also safe for the screen.
Most manufacturers accept a certain number of defective pixels as covered by warranty. Take a screenshot of your test result and check your device's warranty conditions on the manufacturer's official website.

How to Use?

1

Choose Your Device

Select PC, Mobile/Tablet, or Smart TV mode depending on the device you want to test.

2

Launch Full-Screen Test

Click the launch button to enter full-screen mode. The test automatically starts with solid colors.

3

Inspect Each Color

Use Space, arrow keys, or swipe to change colors. Look for dots that don't match the background on black, white, red, green, and blue screens.

4

Color Blind Mode (Optional)

If you have color vision deficiency, toggle Color Blind Mode for high-contrast cyan, purple, and yellow tones.

5

Exit and Review Results

Press Esc or double-tap to exit. If you found pixel defects, try the Noise test to fix them or contact an authorized service center.