Connect a controller by USB or Bluetooth and press any button on it — browsers only reveal a controller after a button press.
This test vibrates every motor in your controller one by one, tells you which ones work, and lets you drive them by hand to hunt down rattles and weak spots.
Most controllers have two rumble motors in the grips. The left one carries a heavy weight and gives a deep, slow rumble; the right one carries a light weight and gives a faster, finer buzz. Games mix the two to make an explosion feel different from footsteps. The PS5 DualSense replaces both with voice-coil actuators that imitate them, and Nintendo controllers use linear actuators with the light channel played much more softly.
The guided check plays each motor on its own at full strength for a moment and asks what you felt: a clear vibration, only a faint one, a rattle, or nothing. No browser can measure whether a motor actually turned, so your hands are the sensor — and asking about each motor separately is what tells a dead motor from a broken signal path. If every motor stays silent the problem is almost always software; if only one does, it is that motor.
Xbox One and Xbox Series controllers have a small extra motor inside each trigger, known as impulse triggers. Chrome and Edge can drive them on Windows and macOS, and the test adds both triggers to the check automatically when they are available. The DualSense's adaptive triggers are a different mechanism — resistance, not vibration — and browsers can't reach them through the standard gamepad interface.
Chrome, Edge and Opera on Windows, macOS, Linux and ChromeOS can vibrate controllers, and so can Safari on a Mac. Firefox has never shipped controller vibration, and no browser on iPhone or iPad supports it. On Windows, Chrome has no vibration path to the PS5 DualSense, although a DualShock 4, Xbox and Switch Pro controller all work. When a browser can't reach the motors, the page says why instead of leaving you guessing.
If nothing vibrates, close Steam and controller remappers like DS4Windows or reWASD, which can take over the controller, then switch from Bluetooth to a USB cable and charge the battery — a low battery switches the motors off on many controllers. If one side stays silent while the other works, the signal reaches the controller and that motor, its solder joints or its connector has failed. A rattle or grinding noise means the weight on the motor shaft is loose or the motor has come off its mount.