How to test your touch screen
- Place one finger on the area, then add more, one at a time.
- Each touch shows a numbered circle that follows your finger.
- Most at once records the highest number tracked together.
- Drag fingers slowly across the whole area to check for dead zones, where the circle disappears or freezes.
What the results tell you
| Result | Meaning |
|---|---|
| Max touches matches “Device reports” | Multi-touch is working fully |
| Max lower than reported | Possible digitiser problem, or fingers placed too close together |
| Circle freezes or vanishes in one area | Dead zone. Often a cracked digitiser or a screen protector problem |
| Ghost circles appear without touching | Phantom touches. Clean the screen, remove the protector, check for moisture |
| Circle lags behind your finger | Normal on low refresh rate screens, but a big lag can mean the device is overloaded |
Tips for an accurate test
- Remove gloves and make sure your fingers are dry.
- Spread your fingers at least 1–2 cm apart. Touches that are too close can merge into one.
- Check edges and corners carefully. They’re the most common place for dead zones after a drop.
- Test without the case if touches at the edges fail. Some cases press on the screen edge.
This works on phones, tablets, touch-screen laptops and touch monitors in any modern browser. Nothing is recorded or sent anywhere.
Frequently asked questions
How many touch points do phones support?
Most modern phones and tablets track 5–10 simultaneous touches. Touch-screen laptops usually support 10. Older or budget devices may support only 2–5.
What is 'Device reports'?
It's the maximum number of touch points your browser says the device supports (navigator.maxTouchPoints). The test also shows how many it actually tracked.
Last updated