Touchscreen test
Trace continuous lines, inspect edge coverage and observe simultaneous touches.
Diagnostic visuals retain their original colors and remain visible. Presentation filters and high contrast apply outside this workspace; device-level filters may still affect your observation.
Draw across the grid and around each edge. Try several fingers, then record visible gaps.
Enable JavaScript to run this interactive test. The guide and methodology below remain available.
How to run this check
Draw across the grid and around each edge. Try several fingers, then record visible gaps.
Understand the result
PASS describes a received signal or your recorded observation. WARNING calls for another check. USER REVIEW REQUIRED means a measurement alone cannot decide. An unavailable API or denied permission does not establish hardware failure.
What this cannot tell you
Coverage reflects received touches in the test surface only. The browser cannot know your intended touch path.
If something seems wrong
Clean and dry the screen. Remove an interfering protector and compare another touch app.
Understanding browser permissions →Good to know
Is anything uploaded?
Raw diagnostic input and media are processed locally. Standalone results remain in page memory. Guided checks offer optional coarse session recovery for 24 hours; it excludes media and detailed measurements. Hosting and Google Analytics requests still leave your browser. Analytics receives only broad test-usage categories, never these diagnostic contents. See the privacy policy.
Does a pass guarantee my hardware is healthy?
No. It records behavior observed in this browser session. Intermittent faults, internal components and operating-system restrictions need further investigation. See our methodology.
Related checks
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Start Test Keyboard, Mouse & TouchMouse & double-click test
Inspect buttons, movement, scrolling and suspiciously close click events.
Start Test Keyboard, Mouse & TouchMouse event-rate estimate
Estimate the rate of pointer events delivered to this browser.
Start Test Keyboard, Mouse & TouchTouchpad observation test
Observe pointer movement, clicks and vertical or horizontal scrolling from your touchpad.
Start Test