Touch Screen Test: Multi-Touch, Pen & Coverage Check

Test touchscreen and stylus input in your browser. Visualize multiple contacts, pressure, continuous trails, screen coverage, edges, and corners.

Input support

Touch + Pen + Multi-touch

Coverage map and corners

8 × 5 Grid

Processing

Local only

Touch input surface

Touch the surface with one or more fingers or a stylus.

Ready

Active contacts

0

Maximum contacts

0

Surface coverage

0%

Corners reached

0/4

TL
TR
BL
BR

Draw across the entire surface

Use multiple fingers, trace slow lines, cross the center, and reach every edge and corner. Each contact receives a separate color.

Detected pointer data

Input types

-

Touch starts

0

Pen starts

0

Mouse starts

0

Move samples

0

Reported touch points

-

Recent contact events

Touch the surface to create an event log.

Result summary

A compact view of the current test state and the strongest signal detected so far.

Ready for touch input

Maximum contacts

0

Surface coverage

0%

Corners reached

0/4

Input types

-

Touch the test surface with one or more fingers.

How to test a touchscreen

1. Open this page directly on the touchscreen device. 2. Enter full screen and draw slow lines from edge to edge. 3. Touch all four corners and fill the 8 by 5 coverage grid. 4. Place several fingers at once and compare the maximum contact count. 5. Repeat with a stylus if the device supports pen input.

How to interpret gaps

A missed grid cell does not automatically prove a dead zone. Repeat the line slowly, remove any screen protector interference, clean the panel, and compare another browser. System gestures near an edge may intercept contacts before the page receives them.

Touchscreen test versus trackpad test

This page reads real touch and pen Pointer Events from a screen and tracks simultaneous contacts. Trackpad Check focuses on scrolling, swiping, clicks, and gestures reported by a laptop trackpad, which browsers often expose as mouse or wheel events.

Simultaneous touch contacts, touch versus pen input, pressure and contact size exposed by the browser, continuous colored trails, 40-zone surface coverage, four-corner reach, and recent contact events.
The browser reports input events, not raw touchscreen firmware data. Pressure, contact size, pen tilt, maximum contacts, and edge behavior depend on the device, operating system, driver, browser, and system gestures.
Q: Can a mouse test my touchscreen? A: No. Mouse drawing only previews the interface; a real test requires touch or pen events. Q: Does an untouched grid cell prove a dead zone? A: No. Repeat slowly and rule out browser gestures, screen protectors, dirt, and driver issues. Q: Can this measure touch latency? A: Not reliably. Browser event timing includes display, operating system, driver, and scheduling delays. Q: Is any touch data uploaded? A: No. The visualization runs locally in the browser.

Related tools

Continue with the next check that best matches the symptom you are troubleshooting.

Troubleshooting Center

Start with the symptom

Best next step

Trackpad Check

Check movement, drag, scroll, zoom, and secondary click behavior from one browser page.

Open tool

Display Check

Check display resolution, refresh rate, gradients, and motion clarity.

Open tool

Screen Color Test: Grayscale, Gradients & Uniformity

Test grayscale separation, smooth gradients, shadow detail, highlight detail, RGB transitions, and panel uniformity with full-screen patterns.

Open tool