Gamepad Tester, Test Your Controller Online
Free online gamepad tester. Check every button, analog stick and trigger, detect stick drift, and test vibration for any controller in your browser.
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A gamepad tester lets you check every part of a game controller in seconds, directly in your browser, with nothing to install. Controllers fail in subtle ways: a stick that slowly drifts and moves your character on its own, a trigger that never reaches full pull, a button that registers twice or needs a hard press to respond. These faults are hard to confirm inside a game, where dead zones and assists mask the raw signal. A visual controller test shows you exactly what the hardware is reporting, which makes it the first thing to run before buying a second-hand pad, after a drop or a spill, or whenever a game starts doing things you did not ask for.
Frequently asked questions
How do I use the gamepad tester?
Why does my controller not show up?
What is stick drift and how do I detect it here?
What does the mapping value mean?
Can I test the vibration or rumble motors?
Which controllers work with this test?
Do the triggers show analog values?
Can I test several controllers at the same time?
Why do my stick values never rest at exactly zero?
Is any of my input sent to a server?
About Gamepad Tester, Test Your Controller Online
Using the tool is straightforward: plug in your controller over USB or pair it over Bluetooth, then press any button so the browser detects it. The tester immediately shows the controller's identity string and its mapping type, then starts a live visualization of everything the pad reports. Every button appears with its pressed state and its exact analog value on a fill bar, both analog sticks are plotted on crosshair grids so you can watch the raw X and Y coordinates in real time, and the triggers get dedicated bars that reveal their full analog travel from 0.00 to 1.00. If your controller has rumble motors and your browser exposes them, a vibration test button fires both motors so you can confirm haptic feedback works.
The most common fault a controller test uncovers is stick drift. Release both sticks completely and look at the reported values: a healthy stick settles very close to 0.00 on both axes, typically within a few hundredths. If a resting stick consistently reports values like 0.15 or drifts further over time, the potentiometer or Hall sensor inside is worn or dirty, and you will see phantom movement in games the moment the game's dead zone is smaller than the drift. The crosshair plot also lets you check stick range and circularity: rotate each stick slowly around its full perimeter and the dot should trace a smooth, roughly circular path that reaches close to the edges. Flat spots, corners it cannot reach, or jumpy movement all point to mechanical wear.
Everything runs locally through the standard Gamepad API built into modern browsers, so no input data ever leaves your device. The tester works with Xbox and PlayStation controllers, the Switch Pro Controller, and virtually any generic USB or Bluetooth gamepad your operating system recognizes. Controllers that follow the standard layout get friendly button names (A, B, bumpers, triggers, D-pad); anything else is shown with raw button and axis indexes so you can still map and test every input. You can connect several controllers at once and switch between them, which is handy for checking a whole set of pads before a local multiplayer session.
From the Cross-Shaped D-Pad to Drifting Sticks
The modern gamepad owes its shape to a Nintendo engineer solving a very practical problem. In the early 1980s, Gunpei Yokoi's team needed a joystick replacement compact enough for the Game & Watch handheld version of Donkey Kong, and came up with a flat cross-shaped pad that let a thumb press four directions and the diagonals between them. The design worked so well that it became the defining feature of the NES controller in 1983 and earned Nintendo an Emmy award for technical innovation decades later. Analog control arrived in mainstream form with the Nintendo 64 controller in 1996, followed a year later by Sony's Dual Analog and then the DualShock, which established the twin-stick layout that virtually every controller still uses today.
Rumble also has a precise birthday: the Rumble Pak, a battery-powered accessory that slotted into the Nintendo 64 controller in 1997 to accompany Star Fox 64. Sony built vibration motors directly into the DualShock the same year, using two motors with different eccentric weights, one strong and one weak, a scheme so durable that the web's Gamepad API still calls its main haptic effect dual-rumble. The idea has since evolved into far more sophisticated hardware: the Switch's HD Rumble uses linear resonant actuators precise enough to fake the feeling of ice cubes shifting in a glass, and the PlayStation 5's DualSense adds voice-coil haptics and adaptive triggers that can physically push back against your finger.
Stick drift, the fault this tester is most often used to hunt down, became big enough to reach the courts. The Joy-Con controllers of the Nintendo Switch drew class-action lawsuits in the United States starting in 2019, and pressure from European consumer organizations followed; Nintendo eventually apologized and offered free repairs in many regions. The root cause is mundane: most sticks measure position with tiny potentiometers whose resistive tracks physically wear away with use, and once the resting reading moves outside the game's dead zone, characters walk by themselves. It is also why newer premium controllers advertise Hall-effect or TMR sticks, which sense a magnet instead of dragging a wiper across a track and therefore have essentially nothing to wear out.