Touch Screen Test.
Count simultaneous fingers, scribble to find dead spots, or drag across a grid to prove full coverage — for phones, tablets and touch monitors.
How the touch screen test works
Your screen's digitiser reports every finger as a separate pointer with a position. This test draws what it receives straight back onto a full-screen canvas, so whatever the panel registers, you see — and whatever it misses shows up as a gap. Three modes cover the three things that go wrong: touch count, dead spots and coverage.
- 1. Multitouch. Press with several fingers at once; each gets a numbered coloured disc and the counter records the most seen together — your panel's simultaneous-touch limit.
- 2. Draw. Scribble across the whole panel. A clean, unbroken line everywhere means a healthy digitiser; a break or a jump marks a fault.
- 3. Coverage grid. Drag until every cell fills. Any cell that will not mark is a dead zone.
- 4. Judge it. A consistent dead area or a low touch count points at hardware or a driver; clean the screen and reboot before blaming the panel.
What your results mean
What the multitouch, draw and grid modes show maps straight to whether the digitiser is healthy or where it's failing.
| What you see | What it means | What to do |
|---|---|---|
| Every finger shows a numbered disc, and the max count matches the spec | Multitouch works fully | Nothing to do. |
| The max counter caps below what the screen is supposed to support | A driver limit, or the panel's real ceiling is lower than advertised | Update or reinstall the touch driver, then re-test. |
| A patch where the draw line breaks or a grid cell won't fill | A dead zone in the digitiser | Clean the screen and remove a thick protector; if it persists, it's likely hardware. |
| The drawn line jumps or jitters instead of following your finger | Noisy or unstable touch tracking | Dry your fingers, clean the screen, and rule out interference from a case or protector. |
| Only ever one dot appears in multitouch mode | You're using a mouse or trackpad, not a touch panel | This test needs real touch input — try it on the device's touch screen itself. |
Frequently asked questions
How do I test a touch screen?
Open this test full screen and use the three modes. Multitouch shows a numbered coloured disc under every finger and records the most it saw at once, so you can confirm how many simultaneous touches your screen supports (often 5 or 10). Draw lets you scribble across the whole panel to find spots that do not respond or where the line jumps. The coverage grid marks each cell you touch, so dragging over the whole screen proves there are no dead zones.
How many touch points should my screen support?
It varies by device. Most modern phones and tablets handle 10 simultaneous touches; many laptop and monitor touch panels handle 10, some older or budget ones 5 or fewer. Put as many fingers down as you can in the multitouch mode and read the "max" counter — that is your panel's real limit. If it caps below what the spec claims, a driver or the panel is the limit.
How do I find a dead zone on my touchscreen?
Use the draw mode and slowly scribble to cover every part of the screen, or use the coverage grid and drag until every cell is marked. Any area where the line breaks, stops, or a grid cell will not fill is a dead zone — a spot the digitiser is not registering. Edges and corners are the usual suspects. A consistent dead zone points at hardware; intermittent gaps can be a dirty screen, a thick screen protector, or a loose connection.
Does this work with a stylus or on a laptop trackpad?
It works with anything the browser reports as a pointer — finger, capacitive stylus, or an active pen — because it uses the Pointer Events API. On a non-touch computer your mouse acts as a single pointer, so you can still try the modes, but you will only ever see one point at a time. It does not test a laptop trackpad, which is a separate input device; this is for the touch layer of a screen.
My touch screen is not responding correctly — what next?
First rule out the simple things: clean the screen, remove a thick or misaligned screen protector, and dry your fingers. Reboot, since a stuck touch driver is common. If draw or grid still show a persistent dead zone or the multitouch count is wrong, it is likely hardware or a driver issue — update or reinstall the touch driver, and if it is under warranty, a consistent dead area is a valid claim. On phones, a factory-reset test or safe mode rules out a rogue app.