Touch Screen Test
Swipe across the grid to reveal dead zones and count your screen’s touch points.
Drag your finger (or several) slowly across the whole grid until every cell fills. Cells that never fill mark dead digitizer zones.
How it works
The grid divides your screen into cells that fill cyan the moment they register touch. Sweep your finger slowly across the entire surface — edges and corners included, since digitizer failures cluster there. Any cell that stays dark after several passes marks a dead zone where the touch layer no longer responds. The counter tracks your completion percentage, and the fullscreen button extends the grid over the whole display so the browser chrome doesn't hide a faulty strip.
The touch points readout shows how many fingers your screen tracks simultaneously — place them all down at once to find your maximum. Most phones track 10; budget tablets often 5. Before condemning a screen, restart the device (touch controller glitches often clear) and retest; consistent dead zones across restarts and browsers indicate hardware failure. On a laptop, make sure you're touching the screen — a trackpad reports only one pointer, which is why it shows "1". Suspect the display panel itself rather than touch? Run the dead pixel test too.
Troubleshooting
› Some grid cells won’t fill no matter what
If a region never responds across multiple swipes, that zone of the digitizer is likely dead. Try a restart first — some touch controller glitches clear — then test in a different browser to confirm.
› Max touch points shows 1 on my laptop
That usually means the trackpad, not a touch screen, is being detected — trackpads report a single pointer. If your laptop has a real touch display, touch the screen itself, not the trackpad.
Frequently asked questions
› How do I find dead zones?
Drag your finger slowly across the whole grid. Cells fill as they register touch — any cell you cannot fill after several passes marks a dead digitizer zone.
› What are multi-touch points?
The number of simultaneous fingers your screen tracks. Most phones support 10; budget tablets sometimes 5. Place multiple fingers at once to see your maximum.
› Does this work with a stylus?
Yes — active and passive styluses register as touch input, so you can verify pen coverage across the display too.