Touch Screen Test – Find Dead Zones and Test Multi-Touch
Check whether every part of a phone, tablet or touch-screen laptop responds. Draw over a grid to find dead zones, see how many fingers are detected at once and read pressure values.
Open the test on your device, tap “Full screen” and draw lines over the whole area. Every cell you touch turns green; cells that stay dark even after several tries point to a dead zone. Touch with several fingers to see how many simultaneous touches the screen supports.
How to use Touch Screen Test
- Open this page on the phone, tablet or laptop you want to test.
- Tap “Full screen” for the most accurate result.
- Slowly draw lines across the whole grid.
- Retry any dark cells to confirm a dead zone.
- Put several fingers down to test multi-touch.
Finding dead zones
A dead zone is an area that does not react to touch, often along an edge or where a phone was dropped. Drawing over the grid shows the problem clearly: touched cells turn green, so dark cells remain where the screen did not register your finger. Draw slowly — fast swipes can skip cells even on a healthy screen.
Multi-touch
Most modern phones register 5–10 fingers at once; cheaper tablets and some laptops support only 2–5. The counter shows the current and the highest number of touches. If pinch-to-zoom or two-finger gestures fail in apps, a multi-touch test tells you whether the hardware sees both fingers.
| Result | Meaning |
|---|---|
| Cells stay dark after several tries | Possible dead zone in the touch layer |
| Lines jump or break | Interference, a cracked digitizer or a charger problem |
| Max. touches 1 | Touch layer or browser supports only single touch |
| Pressure always 0.5 or — | Normal: most screens do not measure pressure |
When touches behave strangely
- Remove the screen protector and test again; thick or bubbled protectors cause dead spots.
- Unplug the charger: some cheap chargers cause “ghost touches”.
- Clean the screen and dry your hands.
- Restart the device to rule out a software freeze.
If the problem stays in the same place, the digitizer (the touch layer) is probably damaged. It is usually replaced together with the glass.
Pressure and stylus
Pens such as Apple Pencil, S Pen and many Windows styluses report pressure, which the tool shows between 0 and 1. Fingers usually report a fixed value or none at all.
More device tests
Check the display itself with the Dead Pixel Test, measure the refresh rate and test audio with the Speaker Test. Everything runs in the browser — nothing to install.
Laptops with touch screens
On Windows touch laptops and 2-in-1 tablets, the browser receives touch the same way as on phones. If nothing happens, check that touch input is enabled in Device Manager and that the screen is not in tablet-only mode.
You may also find these free tools useful: Keyboard Tester, Gamepad Tester and Screen Resolution.
Frequently asked questions
How do I test my touch screen?
Open the test, switch to full screen and draw over the whole grid. Cells that stay dark after several tries may be a dead zone.
How many touches does my screen support?
Put several fingers on the screen; the “max. at once” counter shows the highest number detected.
Why does my touch screen not work in one area?
A damaged digitizer, a thick screen protector or moisture are common causes. Test without the protector first.
What are ghost touches?
Touches you did not make, often caused by a faulty charger, moisture or a damaged screen.
Does it show pressure?
Yes, for devices and pens that report pressure; most fingers show no value.
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