Test a touch screen for dead spots
Draw with one or more fingers, or touch every square to find the areas that never respond.
- Runs on your device
- No sign-up
- Works offline after a visit
Draw with a finger, pen or mouse. Each touch gets its own color and number.
0 of 0 squares covered
Grey squares were never touched. Touch them again to rule out a brief miss.
| Touches now | 0 |
|---|---|
| Most at once | 0 |
| Last input | — |
| Pressure, latest touch | — |
| Contact size, px (width × height) | — |
Pressure and contact size show only when the device reports them.
How to test a touch screen
- Choose Draw to test several touches at once, or Grid to find dead spots.
- Touch, draw or tap across the whole area with one or more fingers or a pen.
- Read the touch count and the squares covered. Press Reset to start again.
Questions
How many touches does the test count?
It counts every touch point the page receives at the same time and keeps the highest figure as “most at once”. Screens differ in how many touches they can track together, and this test can only count what the browser passes on.
Why do some squares stay grey?
A grey square never received a touch. Try it again with a fingertip, and check the edges and corners too, because cracks, a loose screen protector or a damaged touch layer can leave dead areas. If the same spot always fails, the screen may need a repair.
Why do pressure and contact size show a dash?
They appear only when the device reports them. A mouse does not report them, and many touch screens report no pressure at all. A value that never changes usually means the screen does not measure pressure.
Is anything recorded?
No. Touches are read and drawn on this page only. Nothing is stored or sent.