Touch screen diagnostic test with grid coverage, multi-touch, and precision checks

Free Touch Screen Test Online - Ghost Touch, Multi-Touch & Dead Zones

Free online touch screen test for phones, tablets, Chromebooks, and touch laptops. Check multi-touch, dead zones and digitizer bands, edge response, tap precision, measured touch sampling rate (Hz), ghost touches, and display colors - then save a PASS/WARN/FAIL report card as PNG.

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Touch Screen Test

Check multi-touch, dead zones and digitizer bands, edge response, tap accuracy, measured sampling rate (Hz), ghost touches, and display colors - then save a verdict report card, all without installing an app.

Cell size:
Checking finger count? Read the multi-touch test guide Failed grid or ghost watch? Open the ghost touch repair guide
Pre-flight checklist (read before testing)
  • Unplug the charger - charging noise is the most common cause of fake ghost touches.
  • Remove thick screen protectors and magnetic cases before judging the digitizer.
  • Lay the device flat on a table and clean the glass.
  • Keep your palm off the screen edges while sweeping the grid.
Touch here to start
Live Pen Pressure Tester

Draw with a compatible stylus. The tool separates analog pressure from the constant 0.5 pressed-state value commonly reported by a mouse.

Start pen test
Waiting for pen input

Use a pressure-sensitive pen and draw a slow straight diagonal, then vary pressure from light to firm. Mouse input is accepted only as a limited fallback.

Guided capability check

  1. Detect a real pen pointerWaiting
  2. Reach light and high pressureWaiting
  3. Move the pen through a tilt rangeWaiting
  4. Finish one deliberate straight strokeWaiting
Draw a straight diagonal for wobble evidence, then make light-to-firm strokes for the pressure curve.

Hold the pen steadily in contact for about one second.

Pressure curve and stroke evidence

Recent pressure history

Pressure distribution
Light-touch reach--
High-pressure reach--
Steady-hold pressure jitter--

Straight-stroke evidence

Draw one deliberate straight stroke with at least eight samples.

Line deviation (RMS)
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Maximum deviation
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Local jitter estimate
--

These pixel values describe the path delivered to this browser. Hand movement, zoom, display scaling, driver smoothing, and browser sampling all affect them; they are not a hardware pass/fail verdict.

Recent samples

Time Pressure Tilt X Tilt Y Twist Buttons
No pen samples yet.

All measurements stay in this browser. Exports contain only this session’s pointer measurements and browser capability flags.

A browser cannot read raw tablet firmware or electrical sensor data. A missing field usually means the browser or driver did not expose it, not that the pen is defective.

Rate Touch Screen Test: 4.8 (4 ratings)

Android app

Need native phone tests? Use the KBT Measure Suite APK

The Android app adds camera measurement, ruler, level, touch, vibration, accelerometer and gyroscope checks that run as native phone tools.

Open Android app page
KeyboardTester.click assistant

Free for your site

Embed this Touch Screen Test on your website

Add this free, no-signup tool to your own page or blog post in one click — just keep the small credit link.

Touch Screen Test guide

How to use the Touch Screen Test accurately

Free online touch screen test for phones, tablets, Chromebooks, and touch laptops. Check multi-touch, dead zones and digitizer bands, edge response, tap precision, measured touch sampling rate (Hz), ghost touches, and display colors - then save a PASS/WARN/FAIL report card as PNG.

01 How to Test Your Touch Screen Start with Dead zones mode in fullscreen and sweep corner to corner - the tool will highlight whatever you missed for a confirmation pass.
02 What the Results Mean A healthy screen passes the grid after confirmation, keeps every edge lane responsive, taps within a few pixels of each target, holds the expected number of simultaneous touches, and stays silent during the ghost watch.
03 Touch Screen Test FAQ Use Dead zones mode in fullscreen and drag over every grid cell - fast swipes cannot skip cells. At 92% coverage the tool highlights what is left for a confirmation pass; only cells still empty after that second pass count as...

Related guide Multi-Touch Test Online: How Many Fingers Can Your Screen Detect? →

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Touch Screen Test FAQ

Common touch screen test questions

How do I find dead zones on a touch screen?

Open Dead zones mode, enter fullscreen, and drag over every grid cell. Fast swipes are interpolated so cells cannot be skipped. When coverage reaches 92 percent the tool highlights the remaining cells for a confirmation pass - only cells still empty after that second pass are counted as dead.

How do I check my touch screen sampling rate?

Open Sampling rate mode and swipe in continuous circles for about 4 seconds. The tool counts coalesced touch samples per second of active dragging and reports the median in Hz: under 75 is a 60Hz-class panel, 75-150 is 120Hz class, 150-300 is gaming class, and above 300 is flagship class.

What does a dead row or column on a touchscreen mean?

Capacitive digitizers fail by sense line, so a full-width or full-height stripe that never responds is a classic digitizer row or column failure. If the grid shows a dead band while the neighboring lines work, the panel usually needs a screen replacement - software fixes will not help.

Why does my iPhone only show 5 touch points?

iOS Safari caps touch delivery to web pages at 5 simultaneous touches, even though the hardware tracks more. This test expects 5 on iPhone and iPad and never flags it as a failure - it is a browser limit, not a digitizer fault.

Can this test detect ghost touches?

Yes. Start the ghost watch (30 or 60 seconds), remove your hands during the 3-second grace period, and keep them away. Every phantom event is logged with its position and marked in red.

What should I do if this test finds ghost touches or dead zones?

Save the PNG report card, retest with the screen protector and charger removed, and compare the pattern with the detailed KeyboardTester ghost touch and touchscreen dead-zone troubleshooting guide. The report embeds the verdict, stats, and device info so a repair shop can see exactly what failed.

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Windows app

KeyboardTester.click is available from Microsoft Store

Install the official Windows app shortcut, or keep using the same free testing tools in your browser.

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