HTML5 Gamepad API · no download, no account
A gamepad tester is able to capture all the signals sent by your gamepad and display them in real time in their raw state. The current state of buttons, sticks, triggers, and even vibration feedback—everything is revealed in its naked form before being filtered out by any game, gamepad drivers, or even deadzone configurations.
The gamepad tester uses the HTML5 Gamepad API and works entirely inside your web browser, without any installation, software, or account setup required. Just plug in your PS5 DualSense controller, your Xbox Series controller, your Nintendo Switch Pro Controller, or any other USB/Bluetooth gamepad, hit a few buttons, and off you go!
Nothing stored or transmitted
Full diagnostic console
Buttons, sticks, triggers, vibration, latency and a 0-100 health score — plus a downloadable report, all in this tab.
The browser does not detect your controller until you press a physical button. This is a security rule built into every browser that uses the Gamepad API. It stops websites from silently scanning your connected hardware.
Connected before this page loaded? Reload, then press a button.
All input data is processed locally in your browser using the HTML5 Gamepad API. Nothing is stored or transmitted.
The basics
A gamepad tester is a device that captures live input data from your gamepad and displays it on your computer screen. It captures every single action that you make on your gaming console such as pressing a button, moving the sticks, triggering and feedback.
People often realize that they need a Gamepad test only after something seems to go wrong. For example, the character in the game walks without input. A button stops registering cleanly. The trigger button may be squishy, but you are not certain whether this is an actual mechanical issue or merely a game setting. The tester gamepad will provide the answer in the form of digits, rather than assumptions.
This device functions completely within your browser window, thanks to the HTML5 Gamepad API, which is natively implemented in Chrome, Edge, Firefox, and Safari browsers. The tester can handle USB or Bluetooth gamepads, work with up to four controllers simultaneously, and update as frequently as 60 times per second.
Step by step
The browser does not detect your controller until you press a physical button. This is a security rule built into every browser that uses the Gamepad API. It stops websites from silently scanning your connected hardware. Press any button once, and the tester activates your controller slot instantly.
Hardware
This online gamepad tester works with any HID-compliant controller your operating system recognizes. These are the most common families.
Chrome and Edge give the best access to PlayStation hardware. Adaptive trigger resistance data from the DualSense is readable in Chrome.
All Xbox hardware uses the XInput standard on Windows, which maps cleanly to the Gamepad API. Full button, trigger, and vibration access in Chrome, Edge, and Firefox.
Button labels follow the ABXY layout for cross-platform consistency in the tester.
Available features depend on what the controller reports to the browser. If it works with your OS, it will almost certainly work here.
Diagnostics
Every button returns a pressed/released state plus a timestamped log entry. The Input History panel records every press and release so you can scroll back and review. This catches buttons that do not register, buttons that register without being touched, and buttons that fire twice from a single press.
Sticks return X and Y axis values between -1.0 and +1.0. The tester plots movement on a live visual pad. Look for:
Analog triggers go from 0.0 (released) to 1.0 (fully pressed). A trigger that maxes out at 0.7 feels fully pressed but is not sending a full signal. This is more common than people realize, and it affects aiming speed in shooters and acceleration in racing games. The tester shows the exact peak value so you know immediately.
The tester fires your rumble motors at adjustable intensity levels. Chrome handles this most reliably. If the left motor works and the right does not, the internal motor connection is failing or the motor itself is worn out. The Pulse preset is useful for checking whether the haptic response is consistent or stuttery.
This measures the time between your button press and when the browser receives the signal, in milliseconds. Typical results:
| Connection | Typical Latency |
|---|---|
| USB wired | Under 8ms |
| 2.4GHz dongle | 1 to 5ms added |
| Bluetooth | 10 to 30ms added |
The tester scores your controller from 0 to 100 based on all inputs. 90 and above is excellent. Below 70, at least one input is failing or degraded. The score gives you a quick answer when you want to know if a controller is worth repairing or not.
Under the hood
When you plug in or pair a controller, your operating system detects it and installs a driver. For Xbox controllers on Windows, this is XInput. For PlayStation and most others, it is the standard HID driver. The browser reads from whichever driver the OS installed.
Connection paths:
| Method | How It Reaches the Browser |
|---|---|
| USB wired | OS HID driver → Browser Gamepad API |
| Bluetooth | OS Bluetooth stack → HID profile → Gamepad API |
| 2.4GHz dongle | Dongle appears as USB HID → Gamepad API |
Every input generates a signal the moment it changes.
| Input Type | Signal Range |
|---|---|
| Digital buttons | 0 = released, 1 = pressed |
| Analog triggers | 0.0 to 1.0 |
| Analog sticks | X/Y axis: -1.0 to +1.0 |
Inside the controller, a microcontroller chip scans all sensors continuously. It converts analog signals (stick position, trigger pressure) to digital values, packages everything into a controller report, and sends it to your device at roughly 1000 times per second over USB, or at the Bluetooth polling rate wirelessly.
The browser Gamepad API reads the controller report through the OS. It does not use event listeners for keyboard input. Instead, it polls on a cycle that matches your screen refresh rate, typically 60 times per second. The tester calls navigator.getGamepads() on each animation frame and updates the display with whatever the controller is reporting at that instant.
Every input maps to a visual element on screen:
The display updates in real time. There is no delay between what the controller sends and what you see.
The common failure
Stick drift happens when your analog stick reports movement without you touching it. The character walks by itself. The camera drifts slowly to one side. Your crosshair pulls off target. Over 40% of early DualSense and DualShock 4 controllers develop measurable drift within two years of heavy use. It is the most common controller failure across every major brand.
The joystick module inside most controllers uses a potentiometer: a carbon film resistive strip that changes resistance as the stick moves. When the stick is centered, the resistance should read a specific value that the controller maps to 0.000. Over time:
Controllers with Hall Effect sensors use magnets instead of contact-based resistors, which is why brands like 8BitDo and Gulikit market their controllers as drift-resistant. The magnetic detection has no physical wear surface.
| Resting Axis Value | Status | Action |
|---|---|---|
| 0.000 to ±0.04 | Factory precision | Nothing needed |
| ±0.05 to ±0.10 | Minor drift | Monitor monthly, games mask it |
| ±0.10 to ±0.20 | Moderate drift | Clean with 90%+ isopropyl alcohol |
| ±0.20 to ±0.30 | Significant drift | Clean first, replace the module if it returns |
| Above ±0.30 | Severe drift | Replace the joystick module |
The tester reads raw axis values before any game applies a deadzone. If the tester shows drift but your game feels normal, the game is masking it. The stick is still degrading. Check the raw values monthly and track whether the number is growing. A value of ±0.08 today that becomes ±0.18 in three months tells you the potentiometer is wearing fast. You want to know that before the drift gets bad enough to cost you a ranked game.
Field guide
PlayStation
The PS5 DualSense is one of the most-tested controllers on this tool in 2026. It connects via USB-C or Bluetooth and gives full button and axis access in Chrome and Edge. A few things to know:
The DualSense also has a built-in microphone and speaker. Neither is testable through the Gamepad API. For full PS5 controller testing, including haptic patterns, use USB over Chrome on Windows or macOS.
Xbox
Xbox controllers are the most reliably detected gamepads on Windows. The XInput standard is built into the OS and maps directly to the Gamepad API with no extra setup. What you get:
One thing worth noting: the Xbox controller on macOS does not always expose vibration through the Gamepad API. Use Windows or Chrome on macOS for the most complete test.
Before you pay
Buying a used controller is risky. A controller that looks fine can have significant internal wear. Two minutes with an online gamepad tester tells you exactly what you are getting before you hand over money.
Stick drift test: Release both sticks and read the resting values. Anything above ±0.10 is a red flag. Above ±0.20, walk away.
Full button test: Press every button, bumper, trigger, and D-pad direction. Check the Input History log for any missed presses or double fires.
Trigger range: Pull each trigger fully and confirm the value hits 1.0 or very close to it.
Vibration: Run the rumble test on both motors. One silent motor means an internal failure.
Latency: Run the latency test over USB. A wired controller reading above 20ms needs investigation.
Connection
The connection type affects what the tester can measure. This matters more than most people realize.
| Connection | Typical Latency | Vibration Support | Stability |
|---|---|---|---|
| USB wired | Under 8ms | Full (Chrome/Edge) | Highest |
| Bluetooth | 10 to 30ms added | Full (Chrome/Edge) | Good above 50% battery |
| 2.4GHz dongle | 1 to 5ms added | Full (Chrome/Edge) | Very good |
Wired is the best choice for running a diagnostic test. The latency numbers are cleaner, and the connection does not drop during testing. Bluetooth signal quality also drops when the controller battery falls below about 20%, which causes phantom inputs and latency spikes that look like hardware failures but are just a power issue.
When comparing two controllers, use the same connection type for both. A Bluetooth controller will always show higher latency than a wired one, even if its hardware is in better condition.
Compatibility
The HTML5 Gamepad API has broad browser support in 2026. Chrome and Edge give the most complete feature access.
| Browser | Min Version | Buttons/Sticks | Vibration | Adaptive Triggers |
|---|---|---|---|---|
| Chrome | 21+ | Full | Yes | Yes (DualSense) |
| Edge | 12+ | Full | Yes | Yes (DualSense) |
| Firefox | 29+ | Full | Partial | No |
| Safari | 10.1+ macOS | Full | No | No |
| Opera | 24+ | Full | Partial | No |
| Samsung Internet | 4+ | Full | Yes | No |
If vibration is not working and everything else is, the first thing to check is which browser you are using. Safari does not support rumble testing through the Gamepad API at all. Firefox supports it inconsistently depending on the OS and controller combination.
Operating systems
Windows 10 and 11 handle Xbox controllers natively through XInput. PS4 and PS5 controllers install automatically over USB on both versions. Use Chrome or Edge for the most complete test, including vibration. The Xbox Accessories app handles firmware updates for Xbox hardware.
PS5 DualSense and Xbox Series controllers pair via Bluetooth on macOS 12 and above. USB also works on both. Chrome on macOS gives the best feature coverage. Vibration support through the Gamepad API on Mac is less consistent than on Windows, especially for non-Xbox controllers.
USB is the most reliable connection method on Linux. Bluetooth support through the Gamepad API varies by distribution and kernel version. The tester works in Chrome and Firefox on most major distros. If a controller connects but shows no input, check the joystick device permissions.
Bluetooth and USB OTG connections both work with Chrome for Android and Samsung Internet. The tester runs entirely in the browser. No app needed. Latency and button testing are available. Haptic testing depends on the browser version and the controller.
Safari 16.4 and above supports basic gamepad input on iOS. Button and axis tests work. Vibration and trigger range testing are not currently supported. Pair the controller via Bluetooth in iOS Settings before opening the tester.
If nothing shows up
If your controller was connected before the page loaded, the API may have missed the connection event. Reload the page, then press any button on the controller. This fixes the majority of "controller not found" reports.
Firefox and Safari miss some Gamepad API features. If something is not displaying correctly, switch to Chrome or Edge and reload.
Some browsers show a permission prompt for gamepad access. Click Allow. If you previously denied it, go to Site Settings, find Gamepad, and reset the permission before retrying.
Low battery causes intermittent disconnections, phantom inputs, and latency spikes. Charge the controller fully before running any diagnostic test. A low battery will give you inaccurate readings and make hardware problems hard to distinguish from power problems.
Open Device Manager and look for controller entries with a warning icon. Right-click and update the driver. For Xbox controllers, use the Xbox Accessories app to check for firmware updates. For PlayStation controllers, the native Windows HID driver covers most cases without additional software.
Who it is for
Stick drift at ±0.15 is invisible in a casual game with a generous deadzone. In a competitive shooter or racing sim, that same drift shifts your aim constantly. Testing monthly means catching the problem before it affects your performance.
A two-minute test before buying a used PS5 controller can save you the cost of the controller. The tester shows exactly what the hardware reports.
Document the controller's baseline before repair. After replacing the joystick module, run the full test again. The before and after axis values prove the fix worked, which is useful when customers want confirmation.
Phantom button presses or stick drift during a live stream look like player mistakes. Testing before going live takes two minutes. It also helps when troubleshooting whether something strange on screen is the controller or the game.
Kids are hard on controllers. The tester runs in a browser, needs no installation, and shows a clear visual result. If the left stick is jumping around with no input, the controller needs attention. No technical knowledge is required to read that.
Raw axis data, button timestamps, and input history logs are useful for mapping verification and compatibility testing across controller hardware. Compare Mode lets QA run two controllers simultaneously to verify consistent behavior.
Difference
Most basic controller testers only show whether a button lights up. That tells you almost nothing about the actual condition of the hardware. This tool gives you the raw numbers the controller is reporting, without any game processing getting in the way.
What sets this tester apart:
Keep it healthy
Run a full gamepad test online once a month if you play more than 10 hours per week.
After any session longer than 3 hours, check the resting stick values before putting the controller away. Heat temporarily affects sensor readings, and you want to see if there is underlying drift.
Keep controllers away from dusty surfaces when not in use. Carbon track contamination is the leading cause of potentiometer drift.
Never store a controller with the analog sticks pressed against a surface or under something. Long-term compression accelerates wear on the return spring.
If the controller has been dropped, run the full test immediately. Impacts can shift the joystick return spring without causing visible external damage.
Clean the stick base monthly with a dry microfiber cloth. For deeper cleaning, 90%+ isopropyl alcohol works well. Let it dry completely before reconnecting.
Use wired mode for competitive gaming. It removes connection variables and gives you cleaner diagnostic data when something goes wrong.
FAQ
Read next
Longer reads on drift, calibration, latency, gyro sensors and battery health.
