Connect the controller by USB or Bluetooth, then pick it from the list your browser shows. Nothing is installed and no data leaves your computer.
This tool reads touch data straight from a PlayStation controller, so it shows exactly where your fingers land on the pad — not just whether the pad clicks.
Three things at once: the touch surface, multi-touch, and the click. Your finger position is drawn on the pad in real time and leaves a trail behind it, a counter shows how many fingers the controller reports at once, and the pad's border lights up every time you press it down.
The pad is split into a grid of squares. Each square lights up the first time your finger is registered inside it, so a slow sweep across the whole surface reveals any area that stops responding. Dead spots usually show up as a stripe or a corner that stays dark no matter how many times you cross it.
Browsers expose only the touchpad click through the standard gamepad interface, so reading finger positions needs direct access to the controller. That is what the connect button asks for: you pick the controller from the browser's device list, and the page starts reading its input reports. Everything is processed locally in your browser — no touch data is uploaded anywhere.
Start by wiping the pad with a slightly damp microfibre cloth and drying it — sweat and grease are the most common cause of patchy tracking. Remove any skin or screen protector covering the pad, and try a USB cable if you were on Bluetooth. If a region still never registers, the touch digitizer itself is failing and the controller needs service.