Run this touch screen test directly in your browser. Draw with one or more fingers, cover the screen grid, check edges and corners, and inspect the pointer data your browser reports.
Mouse preview available
Touch and drag across the test area. Each simultaneous pointer uses a different trace color.
All touch input is processed locally. No trails, device details, or results are uploaded or saved.
Use the four modes together. A single pass can miss intermittent input, so repeat any suspicious area with slow and fast movements.
Drag one finger across the panel, then add more fingers. Lines should follow each contact without unexplained gaps or jumps.
Switch to Coverage Grid and trace through the cells. Covered means the browser received input there; Untested only means you have not touched that cell yet.
Touch all eight edge targets, then review pressure and contact size. Some browsers or devices do not expose every field.
Move slowly through the same area from several directions. Compare the coverage grid with free-draw trails, then repeat the touch screen test after cleaning and drying the screen.
A gap can also come from a browser gesture, an operating-system edge action, a screen protector, moisture, or an application-specific issue. This website reports received input; it cannot prove that untouched hardware is defective.
Pointer Events assign an ID to each active contact. The tester keeps those contacts separate, gives each one a functional color, and records the highest number active at the same time.
The number reported by your device and the number a browser can use may differ. Mouse input is useful for previewing the interface on a desktop, but one mouse pointer cannot simulate real multi-touch hardware.
This touch screen test can only see events delivered to the web page. It cannot repair or calibrate touch hardware.
Confirm that the device has a touch display, reload the page, try another modern browser, and close apps that may be capturing gestures.
Exit fullscreen and retry. iPhone, iPad, Android, and Windows can reserve edge gestures for navigation or system controls.
Remove moisture, clean the glass, test without gloves, and temporarily remove a damaged or poorly fitted screen protector.
If this tester responds normally, the issue may be limited to that app, its gesture settings, or its compatibility with your device.
Answers to common questions about browser-based touchscreen testing.
Start the touch screen test in Free Draw and drag across the full panel with one finger, then multiple fingers. Use Coverage Grid to trace each area and Edges & Corners to check the outer targets. Repeat any suspicious area.
Trace the suspected area slowly in several directions and compare free-draw gaps with untouched coverage cells. An untouched cell is not automatically a dead zone; browser gestures, moisture, protectors, and software can affect input.
Place several fingers on the test area at once and watch Maximum simultaneous. The device-reported maximum is also shown when the browser provides it, but real usable capacity can vary by hardware and browser.
No. A website can visualize touch events received by the browser, but it cannot perform hardware calibration or repair a touchscreen. Use your device manufacturer's settings or service tools for calibration.
The device may not have touch hardware, the browser may not be receiving events, or another gesture or application may be intercepting them. Reload, try another current browser, and test outside reserved screen edges.
Yes, the tester uses modern Pointer Events on current iPhone, iPad, Android, and Windows touch browsers. Fullscreen behavior and exposed pointer details vary by browser, especially on iOS Safari.
