Free Dead Pixel Test for Monitors, Laptop Screens, Phones, and Displays
Inspect a display with distraction-free fullscreen color fields, checker patterns, brightness steps, an inspection timer, and a simple defect notebook. No image is uploaded.
Dead Pixel Test for Monitors, Laptop Screens, Phones, and Displays
Built for a complete diagnostic workflow
Fullscreen inspection mode
Dead Pixel Test workflow feature designed for practical browser use.
Five high-contrast palette screens
Dead Pixel Test workflow feature designed for practical browser use.
Keyboard and touch navigation
Dead Pixel Test workflow feature designed for practical browser use.
Checkerboard pattern mode
Dead Pixel Test workflow feature designed for practical browser use.
Brightness-step pattern
Dead Pixel Test workflow feature designed for practical browser use.
Inspection timer
Dead Pixel Test workflow feature designed for practical browser use.
Pause and resume workflow
Dead Pixel Test workflow feature designed for practical browser use.
Defect counter and notes
Dead Pixel Test workflow feature designed for practical browser use.
Current pattern label
Dead Pixel Test workflow feature designed for practical browser use.
Screen-size and DPR report
Dead Pixel Test workflow feature designed for practical browser use.
Copyable inspection summary
Dead Pixel Test workflow feature designed for practical browser use.
Local progress and checklist
Dead Pixel Test workflow feature designed for practical browser use.
How to interpret this dead pixel test
A dead pixel test makes pixel defects easier to notice by removing normal page content and showing large uniform fields. Dark and bright fields can reveal pixels that remain stuck at an unexpected brightness, while high-contrast patterns can expose clusters or panel irregularities.
Clean the display carefully before testing. Dust, fingerprints, or screen-protector artifacts can look like pixel defects. Inspect from your normal viewing distance first, then move closer only when a suspicious point appears.
Use several fields rather than judging the panel from one screen. A pixel that is obvious on a dark field can disappear on a bright one, while a stuck subpixel may be easier to spot against a contrasting field.
This browser tool is a practical visual check. Warranty definitions and allowed defect counts vary by manufacturer, panel class, and region, so document the location of anything suspicious before contacting support.
What the browser can and cannot tell you
| Signal | What it represents | How to use it |
|---|---|---|
| Dark field | Look for unexpectedly bright points | Useful for bright/stuck pixels |
| Bright field | Look for dark or discolored points | Useful for dark pixels and contamination |
| Cyan field | Look for purple/dark anomalies | High contrast within the site palette |
| Purple field | Look for cyan/dark anomalies | Alternative contrast field |
| Checker pattern | Scan for clusters and uneven transitions | Useful after solid-field inspection |
Build a better troubleshooting habit
Start with a baseline
Run the primary diagnostic before changing settings so you have a comparison point.
Repeat the test
One sample can be misleading. Repeat the check and compare the pattern, not only the best number.
Change one variable
When troubleshooting, change one device, browser, permission, cable, or setting at a time.
Separate browser from hardware
A browser result reflects only the parts of the input or output path that the page can observe.
Document the environment
Keep browser, operating system, device connection, scaling, or permission context with the result.
Use the next diagnostic
Open a related ready page when the result suggests a neighboring part of the device or browser stack.
Three quick questions
Finish with a quality review
Recent saved milestones on this device
Continue without a dead end
Free Dead Pixel Test for Monitors, Laptop Screens, Phones, and Displays: FAQ
Can this test repair a dead pixel?+
No. It is an inspection tool and does not claim to repair damaged pixels.
Should I use fullscreen mode?+
Fullscreen reduces distractions and makes it easier to scan the entire display surface.
Why are there no red or green test screens?+
This page follows the site’s restricted visual palette. For manufacturer-specific RGB diagnostics, use the display maker’s own test procedure as an additional check.
How long should I inspect each screen?+
There is no universal requirement. A slow visual sweep of each field is usually more useful than staring at one point for a long time.
Can dust look like a dead pixel?+
Yes. Clean the display and, where appropriate, compare the suspicious point from more than one viewing angle.
Use the result responsibly
This tool reports what a browser can observe or calculate in the current environment. Device firmware, drivers, operating-system processing, permissions, transport, display refresh, acoustic conditions, and browser implementation can add behavior that this page cannot isolate.
External technical reference: MDN: Fullscreen API ↗.