Gamepad Tester - Test gamepad buttons, sticks and drift
Gamepad Tester is a free browser tool for checking any connected controller. It shows every button, trigger and stick input in real time, runs a ten-second stick drift observation, requests vibration where the device supports it, and lets you export a local JSON report or print it. Everything stays in your browser: no account, no upload, no tracking of controller data. Short guides explain common connection problems and what the tests can and cannot measure.