How do I find dead pixels on my display?

Use a color-cycling dead pixel test like ours. Clean your screen, start the test, and look carefully for spots that do not match the background color on each test screen.

Dead Pixel Test & Detector

Use our free dead pixel detector to identify stuck pixels, dead pixels, and hot pixels on your display. This comprehensive test cycles through multiple color backgrounds to make defective pixels highly visible.

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Free to Use

16 Colors

Comprehensive Detection

Instant

Results in Seconds

What Are Dead Pixels?

Dead Pixels

Pixels that are not receiving power and appear as small dark/black dots on your display. They fail to illuminate regardless of color changes.

• Appear as black or dark spots
• Permanent defect (hard to fix)
• More common than stuck pixels

Stuck Pixels

Pixels "stuck" in the ON position, displaying a single color (usually red, green, or blue). They may respond to physical pressure or heat.

• Appear as colored dots (RGB)
• Sometimes fixable with tools/methods
• Less common but more noticeable

Types of Defective Pixels

Black Dead Pixel

Appears on colored backgrounds

Red Stuck Pixel

Stuck on red subpixel

Green Stuck Pixel

Stuck on green subpixel

Blue Stuck Pixel

Stuck on blue subpixel

How to Use This Dead Pixel Test

1
Clean Your Screen
Use a soft, lint-free cloth to gently clean your screen. Remove any dust or smudges.
2
Start the Test
Click "Start Test" and press F11 for fullscreen mode (recommended for best results).
3
Look Carefully
Spend 10-15 seconds on each color. Look for spots that don't match the background color.
4
Document Issues
Take photos of any dead pixels found. Note their location for warranty claims.

Frequently Asked Questions

Can dead pixels be fixed?

Dead pixels are usually permanent hardware failures. Stuck pixels sometimes respond to software fixes or physical pressure, but dead pixels cannot be repaired.

How many dead pixels are acceptable?

Most manufacturers allow 0-8 dead pixels depending on the warranty terms. Check your warranty for specifics.

Is this test accurate?

Yes, this is a comprehensive color-cycling test that makes defective pixels highly visible. It's the most effective method for detecting dead and stuck pixels.

Why do I need fullscreen mode?

Fullscreen mode ensures you're testing the entire display surface and eliminates distractions from the browser UI.

💡 Warranty Information

If you find dead pixels within your warranty period, contact the manufacturer with documented evidence (photos). Most manufacturers cover 0-8 dead pixels. Premium displays often have stricter standards.

Common manufacturers: Dell, LG, ASUS, BenQ, Samsung, HP, AOC, MSI

Back to Guides

Black
Click or press F for fullscreen

Current Test Color

Black

#000000

RGB: 0, 0, 0

Test Colors

How to test: Click "Start Dead Pixel Test" or press F to enter fullscreen mode. Use arrow keys to cycle through test colors. Look for any pixels that do not change with the selected color. Press ESC to exit.

Learn about dead pixels, how to identify them, and what options exist for dealing with them

How to Use

1Click the helper above or press the fullscreen button
2Press F, Space, or click the fullscreen icon
3Press ESC to exit fullscreen and return to this page
4Click Download to save as PNG or customize resolution

Keyboard Shortcuts

Fullscreen Mode:Ftool_layout_space_key

Exit Fullscreen:ESC

Download:tool_layout_ctrl_s_key

tool_layout_explore_more_title

tool_layout_view_all_prefix 1+ Tools

How to Use This Tool

What is this Test?

A dead pixel test helps identify non-functioning pixels on your display. Dead pixels appear as dark spots, while stuck pixels appear as colored spots. This tool cycles through colors to make any defective pixels highly visible. Important for quality assurance and warranty claims.

Pixel Issues Explained

Dead Pixels: Black spots that don't display any color
Stuck Pixels: Colored spots (usually red, green, or blue) that don't change
Hot Pixels: Pixels that appear bright and change to other colors unexpectedly
Dust Under Screen: Appears as dark spots but usually in specific locations

What to Look For

Dark spots on solid color backgrounds - indicates dead pixels:
Persistent colored dots - indicates stuck pixels:
Pixels that don't respond to color changes - defective pixels:
Clustered issues - may indicate manufacturing defects:

Testing Tips

•Use each solid color for at least 10-15 seconds
•Test in a dark room with good eyesight for best results
•View from various angles and distances
•Take a photo with your phone to zoom in on suspicious areas
•Compare with known reference displays

Keyboard Shortcuts

FToggle fullscreen mode

SpaceCycle to next color

Arrow KeysNavigate between test colors

RReset to first color

Pro Tip: Document any dead pixels with photos including the pixel location on screen. Most manufacturers have warranty policies that cover a small number of dead pixels (typically 0-8 depending on the brand). Keep your documentation for warranty claims.

In-Depth Guide and Practical Context

This page is designed as an educational reference, not just a quick utility. The goal is to help you understand what the test checks, why the result matters, and when a detected issue is normal behavior versus a real defect. Display behavior always depends on panel type, ambient lighting, calibration, refresh settings, and viewing angle. For reliable conclusions, test multiple times and combine this page with related diagnostics. If your first result looks suspicious, repeat the test after warming up your display for at least 20 to 30 minutes, then compare outcomes before changing hardware settings.

Recommended Testing Workflow

Start with a controlled setup: disable extreme image enhancements, set a neutral color profile, and reduce room glare. Use this tool in fullscreen mode first, then repeat at normal browser size to identify scaling artifacts. Log what you observe in a simple checklist: location of issue, background color, brightness level, and whether the defect is constant or intermittent. This process makes support claims and warranty discussions easier because you can describe repeatable evidence instead of a one-time visual impression.

Use each solid color for at least 10-15 seconds
Test in a dark room with good eyesight for best results
View from various angles and distances
Take a photo with your phone to zoom in on suspicious areas
Compare with known reference displays

Limitations and Interpretation

No browser-based test can replace hardware calibration devices or professional lab measurements. These tools are excellent for practical screening and daily QA, but they should be treated as directional evidence. A panel can pass a visual test and still require calibration for color-critical production work. Conversely, slight non-uniformity can appear during synthetic tests and remain invisible in normal use. Treat results as part of a broader decision process that includes your workflow needs, not just pass/fail criteria.

Typical Constraints to Keep in Mind

•Ambient light can hide or exaggerate defects.
•Factory profiles may prioritize vivid color over accuracy.
•Camera photos of the screen can misrepresent brightness and tint.
•Panel warm-up time can change apparent uniformity.

Common Problems and Fixes

If results seem inconsistent, check basics first: disable night mode, adaptive brightness, and OS color filters. Confirm your browser zoom is 100% and try another browser to rule out rendering quirks. On laptops, switch between battery and plugged-in mode because panel behavior may change with power policies. On high-refresh displays, test at native resolution and native refresh rate. If a suspected issue appears only on one test pattern but not others, you may be seeing content-dependent behavior rather than a hardware fault.

Before You Decide on Repair or Replacement

Use the FAQ below as practical guidance, not legal advice. Manufacturer pixel and uniformity policies vary by model, region, and purchase channel. Document findings with photos, include serial/model numbers, and capture the exact test condition when contacting support. If a problem affects only one app or one cable path, verify source device, cable quality, and GPU settings before concluding the panel is defective. A methodical approach reduces false positives and gives you stronger evidence when escalation is needed.

Related Internal Guides

For a complete assessment, combine this page with adjacent tests and explanations. These internal links help you verify symptoms from multiple angles:

Brightness Test Contrast Test Dead Pixel Test Tools Overview