Touch Screen Dead Zone Test
Touch input diagnostic
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Total touches: 0
Touch the test area to see live browser values.
Check suspected touchscreen dead zones with a free coverage grid. Trace slowly, repeat blank areas, and compare results before suspecting a hardware fault.
How to use this touch screen test
Clean and dry the screen, then slowly trace each row and column with one finger. A cell changes only when this page receives a pointer sample inside it. Revisit blank cells from several directions. Reset and repeat in a second browser. Rotate the device and compare the same physical area of glass to distinguish a screen location from a browser or interface location.
Understanding your test results
Green means a pointer sample reached that cell; it does not certify the entire cell or screen. Blank means untested or no sample received, not a confirmed dead zone. Fast movement may skip cells. Free Draw joins reported samples, so a continuous line alone cannot rule out missing input between them. Repeated failure at the same physical location across browsers is a reason to use manufacturer diagnostics.
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.
Browser limits and troubleshooting
This touch screen test can only see events delivered to the web page. It cannot repair or calibrate touch hardware.
Edges do not respond
Exit fullscreen and retry. iPhone, iPad, Android, and Windows can reserve edge gestures for navigation or system controls.
Input skips or jumps
Remove moisture, clean the glass, test without gloves, and temporarily remove a damaged or poorly fitted screen protector.
Touch screen test FAQ
How can I check for dead zones on a touchscreen?
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.
Can a website calibrate my touch screen?
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.