Touch Screen Test
Count the fingers your screen tracks, and find the spots that do not respond.
Test area
Touch it with one finger, then with more. Drag over every square to find spots that do not respond.
Touch here
Put one finger down to start, then add more.
About the Touch Screen Test
Two things go wrong with a touch screen: it stops tracking as many fingers as it should, and it develops a patch that no longer responds — usually a strip across a cracked corner or under a bad digitiser connection. This page tests both, in the browser, with nothing to install.
Put fingers down on the test area and each one is drawn where the screen thinks it is, with its coordinates, the pressure it reports and the size of the contact. The page keeps the highest number of simultaneous touches it has seen, which is the figure people are looking for: a modern phone usually tracks five or ten, a laptop screen often ten, and a cheap panel sometimes two.
The area is also divided into a grid. Drag a finger over all of it and each square lights up as it responds; the squares left are the ones your screen is not reporting. A pen or stylus works too, and so does a mouse — the page says which kind of input it saw.
This page tests the area on it, which is enough to find a dead patch and to count touch points. To sweep a whole screen edge to edge, and to look for dead pixels at the same time, the dead pixel and touch screen test fills the display and maps the cells that never respond.
How to use it
- Put one finger on the dark test area. A dot follows it with its position, pressure and contact size.
- Add more fingers, up to as many as your hands allow. The most touches at once figure keeps the highest number the screen reported.
- Drag a finger slowly over the whole area, edge to edge. Every square it responds in fills in; squares that stay empty are not reporting touches.
- Press Clear to start again, for instance to test with a stylus or after cleaning the screen. Copy result puts the whole report on your clipboard.
Examples
Five fingers on the area together
5 touches at once · input seen: finger (touch screen)
Dragging over the whole area
42 of 48 squares responded — the six missing squares sit in one column
Squares missing in a line usually mean a cracked digitiser or a loose connector, not a software fault.
Pressing harder with a pen
Pressure rises towards 1.00 and the contact size stays small
What the figures mean
- Most touches at once — the highest number of simultaneous touches the browser reported. Screens have a hardware limit, and a browser may cap it lower; the number is what this device actually delivered.
- Squares covered — how much of the test area has responded at least once. This is the dead-spot check: drag over everything and look for squares that stay empty.
- Pressure — 0.00 to 1.00 where the screen measures force (many pens, some phones). A screen that does not measure it reports one fixed value however hard you press (the Pointer Events standard sets 0.5 while touched), so the page shows a pressure only once the value changes and says not measured rather than pretending.
- Contact size — how wide and tall the browser thinks your fingertip is, in CSS pixels. Only some browsers report it.
- Input seen — finger, pen or mouse, as the browser classifies each pointer.
- Screen — the window size in CSS pixels and the device pixel ratio, which is how many screen pixels make one CSS pixel.
Reading a dead spot
A real dead area shows the same squares missing every time, however you drag over them, and usually in a line or a block. Before blaming the hardware, rule out the easy things:
- a screen protector with a bubble or a lifted edge, or a thick case over the edge of the glass;
- water, grease or sweat on the glass, which makes touches jump or disappear;
- gloves, very dry skin or a fingernail touch — a capacitive screen needs skin contact;
- a charger with no earth, which can make a screen behave oddly while plugged in;
- a browser overlay or a gesture area along the bottom or side of the screen, which may swallow touches that belong to the system.
If the same squares stay empty with the case off, the screen clean and a dry finger, the fault is in the panel or its connector.
Limitations
- A browser reports what the operating system passes it, so a system gesture area along an edge can swallow touches before this page sees them.
- Pressure and contact size are reported by some browsers and screens only; where they are not, the page says so.
- The number of touches a browser exposes can be lower than the panel’s own limit.
- The test covers the area on this page, not the whole screen: a dead spot outside it needs the page scrolled or the browser in full screen.
Privacy
Touches stay in this browser: positions, pressure and the grid are worked out on your device and nothing is uploaded or kept.
Frequently asked questions
How many fingers should my screen track?
Most current phones and tablets track five or ten at once, and so do most laptop touch screens; some inexpensive panels stop at two. The page shows what this device actually delivered to the browser, which is the number that matters for the apps you use.
Some squares never fill in. Is my screen broken?
Probably, if the same squares stay empty after you take the case and screen protector off, clean the glass and drag over them slowly with a dry finger. Squares missing in a line usually mean a cracked digitiser or a loose connector. A single square that fills in on a second try is just a miss.
Why does pressure show “not measured”?
Because most touch screens do not measure force, and the browser then reports a fixed value. Pens on tablets and a few phones do report real pressure, and you will see it move between 0.00 and 1.00.
Does it work with a stylus or a mouse?
Yes. The page handles any pointer the browser reports and names the kind it saw — finger, pen or mouse — so you can test a stylus and a finger separately.