Interactive diagnostic

Touchscreen & multi-touch test

Visualize active touch contacts and check how many simultaneous points this browser receives, entirely on this device.

Processed locally in this browser

Touch events

Touch different areas of the screen

Move one or more fingers inside the pad. Each active contact is marked separately; no drawing, coordinates, or movement history is saved.

Finishing saves only an evidence summary in this browser for 7 days for Device Check. Typed text, input order and movement coordinates are not stored. Untried checks are not failures.

A desktop without touch is not faulty. Reported support without actual contacts leaves touch unverified; it does not establish a hardware fault.

No touch points reportedThe browser report is not a certified hardware limit

Test guide

What this test proves—and what it cannot

The touchscreen test visualizes active touch pointer events inside a controlled surface. It can reveal missed regions, interrupted movement, or limited simultaneous contacts while keeping every coordinate and gesture on the device.

Last reviewed: 2026-09-03

Signals measured

Touch-down, movement, release, and cancellation events
Current and maximum simultaneous contacts observed in the pad
Approximate contact positions within the test surface
navigator.maxTouchPoints as a browser-reported capability hint

How the test works

Each active touch pointer receives a temporary numbered marker.
Pointer capture keeps a contact associated with the pad during movement.
Touch-action is disabled only on the pad so the page does not scroll during inspection.
Markers disappear on release or cancellation; no drawing is saved.

Interpreting the results

SignalWhat it meansNext step

Contacts follow each fingerThe browser received continuous touch events in the areas you tested.Test the exact edge or gesture where the real symptom occurs.

One region misses contactsA protector, moisture, application overlay, digitizer region, or edge-rejection behavior may contribute.Clean and dry safely, remove only a removable protector for comparison, and test an OS app.

Fewer contacts than expectedThe browser, operating system, hardware, or gesture policy may limit simultaneous events.Compare the device specification and a native multi-touch application.

Measurement limits

Reported maxTouchPoints is not a calibrated proof of panel capability.
The browser cannot diagnose digitizer voltage, cable damage, pressure sensitivity, or palm rejection hardware.
Screen protectors, accessibility features, stylus settings, and edge gestures can change behavior.

Missing or privacy-reduced detail is not scored as a fault by itself.

Questions about this test

Can this test find a dead touch zone?

It can help you observe a repeatable missed area. Confirm it in a native operating-system app before concluding that the digitizer is faulty.

Why does the page not scroll inside the test box?

Scrolling is intentionally disabled only on that surface so finger movement can be inspected. Normal page scrolling remains available outside it.