Is my touch screen broken?
Run the test fullscreen and drag one finger over every part of the screen. Cells you touch turn green; anything still grey at the end is an area your screen did not report, which is a dead zone in the digitiser.
Drag a finger over every part of this area. Cells you touch turn green — anything still grey was never reported.
Coverage
0%
Cells reported
0 / 0
Input type
—
Fullscreen is the only way to reach the edges of a phone screen. Sweep straight through the controls — they stop taking taps while your finger is down. To come back, tap Exit, press your phone's back button, or press Escape.
This runs locally in your browser. No device data is uploaded.
Reading the result
A stripe or a patch that never turns green is the clear signal. It usually means a cracked digitiser — the transparent touch layer bonded to the display — or a ribbon cable knocked loose by a drop. The picture underneath can look perfect while the touch layer is broken.
The very edges are a special case. Phones deliberately reject touches right at the edge so your palm does not trigger things while you hold the device, and browsers reserve edge gestures for their own navigation. Judge the panel on the main area rather than the outermost millimetre or two.
When the screen responds but badly
Touches that register in the wrong place, or jump around, point somewhere different: a cheap replacement panel, a thick case pressing on the edges, or moisture that has found its way under the glass. Screen protectors that have lifted at a corner do it too.
If the problem appeared right after a screen replacement, the replacement part is the first suspect. Aftermarket panels vary enormously, and a common giveaway is that they report fewer simultaneous touch points than the original — worth checking with the multitouch test.
Frequently asked questions
- Why do I need to run it fullscreen?
- Because a panel sitting inside a scrolling page cannot reach the screen edges or the area behind the page header, which is exactly where drop damage tends to show. Fullscreen hands the whole display to the test.
- How do I get out of fullscreen?
- Tap Exit in the corner, press your phone's back button or use the back gesture, or press Escape on a keyboard. The controls stop taking taps while your finger is down, so a sweep passes straight through them.
More about this test
The full touch screen test page covers how the test works and what the common faults look like.
Open the Touch Screen Test →