Monitor Test
Show simple visual patterns while you inspect the screen for conspicuous color, brightness or pixel irregularities. Change each pattern manually and use the dedicated fullscreen button to enlarge the test area. This tool supports visual observation; it cannot identify or repair a hardware fault.
Key features
- Eight solid colors, a 16-step grayscale ramp, smooth gradient, grid and checkerboard
- Optional moving black-and-white object that remains paused until you press Play motion
- Fullscreen applies only to the test area and its exit controls
- Keyboard previous/next navigation, Escape exit and focus return
- No automatic flashing, pixel-repair cycle or camera access
How to use
- Choose a pattern and press Start test.
- Inspect the test area, then optionally select Fullscreen.
- Use Previous/Next or the left/right arrow keys to change patterns manually.
- For Motion observation, press Play motion and compare how the edges look while moving.
- Press Exit test or Escape when finished.
Use cases
- Look for a conspicuous bright or dark spot against a solid background
- Compare the visibility of adjacent grayscale levels
- Observe whether a gradient appears smooth under your current display settings
- Compare a stationary object with the same object moving across the screen
Frequently asked questions
Does this prove that a pixel is defective?
No. Dust, scaling, subpixel layout, image retention, browser rendering and viewing angle can affect what you see. Recheck with other patterns and the display manufacturer’s diagnostic procedure before drawing a conclusion.
Can the tool fix stuck pixels or burn-in?
No. It does not run a flashing repair sequence or change display firmware. It provides manually selected observation patterns only.
Is the motion pattern a response-time measurement?
No. The object is a CSS animation. Browser frame pacing, panel processing, eye tracking and the display’s response all affect its appearance. No milliseconds or hardware ghosting score are derived from this pattern.
Why does Fullscreen sometimes fail?
Browser or embedded-window policies may prevent native fullscreen. The inline test still works. Fullscreen covers only this tool’s test area; use Escape or Exit test to close it.
Are grid squares physical pixels?
No. The grid uses CSS pixels and may be scaled by zoom, operating-system display scaling or device pixel ratio. This tool is not a colorimeter or a physical pixel calibration system.
Does the screen change automatically?
Colors and patterns change only when you select them. Motion is separately started and can be paused; leaving the visible tab stops the active test. If a pattern feels uncomfortable, exit it.
Privacy
The tool draws patterns locally and does not read screen contents or request a camera. Selected patterns and motion state remain in page memory, are not sent as diagnostic data and are not saved to browser storage.
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