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Check your screen for dead, stuck, and bright pixels online to quickly evaluate monitor quality.
Tap 'Start Fullscreen Test' to enter fullscreen mode. The screen will display a solid color background.
Carefully observe the screen for any discolored or unlit pixels (dead pixels).
Tap the screen or use arrow keys to switch colors. We recommend checking each color in order.
Test Colors
Whether you just bought a new monitor or are concerned about screen defects, this tool helps you quickly check for dead, stuck, and bright pixels. By cycling through full-screen colors, it allows you to visually identify pixel anomalies and provides clear visual results.
This tool relies on your browser's full-screen color rendering capabilities and may be affected by browser permissions and screen resolution. Test results are for reference only and do not guarantee 100% accuracy. We do not collect any screen data, so your privacy is fully protected.
We recommend testing the solid red, green, blue, white, and black backgrounds in sequence, observing each color for 3 to 5 seconds. If you spot a suspected dead pixel, view it from multiple angles up close to confirm. You can also take a photo of the test results to use as proof of quality for warranty claims.
PX to REM Converter
A bidirectional PX to REM converter for front-end developers and designers, featuring customizable root font sizes.
Random Color Generator
Provides controllable random color generation for designers and developers, supporting multiple formats and hue filtering.
Pixel to Centimeter Converter
Input pixel values and PPI to instantly convert to corresponding physical length in centimeters, also supports reverse conversion from centimeters to pixels, suitable for graphic design, UI slicing, and print layout.
Pixel to Millimeter Converter
Convert between pixels and millimeters based on PPI density. Supports custom density values, ideal for UI design and print layout.
PX to REM Converter
A bidirectional PX to REM converter for front-end developers and designers, featuring customizable root font sizes.
Random Color Generator
Provides controllable random color generation for designers and developers, supporting multiple formats and hue filtering.
Pixel to Centimeter Converter
Input pixel values and PPI to instantly convert to corresponding physical length in centimeters, also supports reverse conversion from centimeters to pixels, suitable for graphic design, UI slicing, and print layout.
Pixel to Millimeter Converter
Convert between pixels and millimeters based on PPI density. Supports custom density values, ideal for UI design and print layout.
PX to PT Converter
A pixel (PX) to point (PT) unit conversion tool for designers and developers. Supports custom PPI for typography and layout adaptation.