TrueScreenTest

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Touch Screen Test

Swipe, drag and tap across the panel below. Lines show where your screen registered touch, the grid fills in as you cover it, and multi-touch mode gives every finger its own color.

Touch here to startDrag slowly into every corner and along each edge. Try several fingers in Multi-touch mode.
Input
Waiting
Active now
0
Most at once
0
Area tested
0%
Touch points reported
–

How to use

How to use the touch screen test

  1. Press Fullscreen so the test area reaches every edge of your display. On iPhone, where Safari doesn’t allow true fullscreen for web pages, the test fills the browser window instead.
  2. Drag one finger slowly across the screen in rows, then along all four edges and into each corner. Lines appear where touch registers and grid cells light up as you cover them.
  3. Look for gaps. A break in a line you drew smoothly, or a cell that won’t light up after several tries, marks an area worth retesting.
  4. Switch to Multi-touch and put several fingers down at once. Each touch gets its own color and number, and Active now shows how many the browser sees.
  5. Check the readouts, then press Clear to start again. Leave fullscreen with Exit, the Esc key or your device’s back gesture.

Controls

Draw
Draws a line wherever you touch and fills the coverage grid.
Multi-touch
Shows a numbered, colored ring and crosshair for each finger.
Grid
Shows or hides the coverage grid. Coverage still counts when hidden.
Clear
Erases lines and resets coverage and counts.
Fullscreen
Fills the screen. Inside, the floating bar has Exit, Clear, mode and a ⇅ button that moves the bar so you can test underneath it.
Area tested
Share of grid cells touched at least once.
Touch points reported
Maximum touches your browser says the device supports.

In-depth guide: How to test a touch screen

Devices

Tips for your device

Phones

Trace the curves and the notch

Test in portrait and landscape. Rounded corners and the area around the camera are easy to miss. A screen protector, a raised case lip or wet fingers can all cause missed touches.

Tablets

Work in a grid

Larger screens are easiest in horizontal rows, then vertical columns. A stylus is reported as Pen / stylus, so you can test it separately from your fingers.

Touchscreen laptops

Keep off the trackpad

Use Edge, Chrome or Firefox in fullscreen. Trackpad and mouse movement is labelled separately and does not test the touch panel.

No touchscreen?

Try it with a mouse

Click and drag to see how the tool works. Mouse lines are grey and the Input readout says Mouse (demo, not touch), so a mouse test is never mistaken for a touch result.

Results

Reading the results

Area tested is the share of grid cells that received at least one touch. It tells you how much of the screen you have checked, not whether the hardware is healthy.

Breaks in a line where your finger moved smoothly can point to a dead zone. Repeat the swipe slowly over the same spot a few times and compare with another app before drawing conclusions.

Lines or dots you did not draw appear when the screen reports touches on its own, often called ghost touches. Leave the screen untouched for a minute and watch. The tool shows what the browser receives; it cannot find the cause or fix it.

Most at once is the largest number of simultaneous touches seen. Touch points reported is the maximum your browser says the device supports. Values of 5 or 10 are common.

Limits

What this test can’t tell you

  • The browser and operating system decide which touches a page receives. Palm rejection, edge-swipe gestures, accessibility features and power saving can hide or cancel touches the hardware did detect. When the browser cancels a touch, the tool says so under the test area.
  • Some areas, such as the bottom edge on phones with gesture navigation, are reserved for system gestures and may never reach the page.
  • On-screen timing depends on the display refresh rate and the browser, so this test does not measure touch latency.
  • Results are a quick visual check. They do not diagnose a hardware fault, certify a screen, or replace a repair technician’s assessment.

FAQ

Questions

Does the test record or upload where I touch?

No. Touch positions are used only to draw on your screen and are held in memory while the page is open. They are not saved and nothing is sent to a server. See the privacy page.

Why doesn’t the page scroll when I touch the test area?

Scrolling and pinch-zoom are switched off inside the test area so your swipes are recorded instead of moving the page. Touch anywhere outside it to scroll as normal.

Fewer touches show up than I put down. Is my screen faulty?

Not necessarily. Some devices and browsers limit how many touches a page receives, and fingers placed very close together can register as one. Spread your fingers apart and check the Touch points reported readout.

My lines disappeared after I rotated the device.

Rotating changes the shape of the test area, so lines are cleared to avoid showing them in the wrong place. The coverage grid is kept and mapped to the new shape.

Can this fix an unresponsive screen or ghost touches?

No. A web page can only display the touches it receives. Restarting, removing the screen protector, cleaning the screen and updating system software are sensible first steps before contacting the manufacturer or a repair service.

Test kit

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