8BitDo SN30 Pro Tester
Connect a controller and press any button — every input is detected and displayed live.
Connect a controller and press any button
Browsers hide gamepads until first input. Plug in via USB or pair over Bluetooth, then press any button to wake the test. On phones, pair the controller in your system Bluetooth settings first.
Buttons
Analog sticks
Circularity test
Rotate a stick around its full rim — we trace the path against a perfect circle.
How it works
The 8BitDo SN30 Pro packs sticks, triggers and rumble into a SNES-shaped body, and like its siblings it is mode-switch dependent. Starting it in the correct mode is the whole game when testing it on a PC.
How to connect your 8BitDo SN30 Pro
USB-C or Bluetooth; start in X mode (hold X + Start to power on) for standard browser mapping.
How the 8BitDo SN30 Pro maps in your browser
Power on in X mode (hold X + Start) for standard browser mapping. In DirectInput or Switch mode the triggers can register as buttons and the layout shifts. Its small size means the sticks are compact potentiometer units.
Thumbstick type and drift risk
Compact potentiometer thumbsticks. Their small size makes even minor drift visible on the circularity trace.
Internal rechargeable battery charged over USB-C.
Known issues and quirks
In D-input or Switch mode, triggers may register as buttons instead of axes.
Once connected, press any button and the tester will detect the pad automatically. Check every button and trigger registers, watch the stick crosshairs for centering, and run the circularity test to quantify stick wear. Suspect drift? Run the dedicated controller drift test for a 10-second automated verdict.
Testing every part of your controller
Browsers hide gamepads until you press a button, so tap any button once to wake the connection. From there, every button, trigger, analog stick and (on supported hardware) vibration motor is displayed live. It works with anything your OS recognizes as a gamepad — Xbox, PlayStation DualShock 4 and DualSense, Switch Pro, and most generic USB or Bluetooth pads.
What to check, and what's normal
| Element | Healthy behavior | Warning sign |
|---|---|---|
| Face & shoulder buttons | Register instantly, release cleanly | Sticky, missed, or double inputs |
| Analog sticks (at rest) | Under 1–2% jitter around center | A constant offset = drift |
| Triggers | Smooth 0–100% travel | Jumps to 100% or won't reach it |
| Vibration | Rumbles on command (Chromium pads) | Silent on Safari/Firefox = browser limit, not the pad |
Troubleshooting connections
- Nothing appears: press any button first; if still hidden, try another USB port or re-pair Bluetooth and reload.
- Layout doesn't match your pad: unknown models fall back to a generic view, but every button and axis is still shown by index — you can fully test it.
- Vibration does nothing: rumble over the web works on Chromium browsers with most Xbox and DualSense pads; Safari and Firefox have limited or no support.
If the sticks jitter beyond a couple of percent at rest, run the dedicated controller drift test for a measured verdict.
Troubleshooting
› My controller is connected but nothing shows
Browsers hide gamepads until you press a button — press any button once. If it still doesn’t appear, try a different USB port or re-pair Bluetooth, then reload the page.
› Vibration test does nothing
Vibration via the browser works on Chromium browsers with most Xbox and DualSense pads. Safari and Firefox have limited or no support — that is a browser limitation, not your controller.
› The layout doesn’t match my controller
Unknown models fall back to a generic layout. Every button and axis is still shown by index, so you can fully test the pad even without a matching picture.
Frequently asked questions
› Which controllers are supported?
Anything your OS recognizes as a gamepad: Xbox (360/One/Series), PlayStation DualShock 4 and DualSense, Switch Pro, and most generic USB or Bluetooth pads.
› Do I need to install anything?
No. The test uses the browser’s built-in Gamepad API — just connect your controller and press a button.
› Why do axis numbers jitter slightly at rest?
Analog sticks always have a little electrical noise, typically under 1–2%. Constant offsets beyond that suggest drift — run the dedicated drift test.
› Can I test controller vibration?
Yes, on Chromium-based browsers with supported pads. Click the vibration button; if nothing happens, your browser or pad doesn’t expose rumble to the web.
Common 8BitDo SN30 Pro problems and how to read them
These are the faults reported most often for the 8BitDo SN30 Pro, what causes each one, and how to confirm it in the tester above before you spend money on a repair or replacement.
| Symptom | Cause | What to do |
|---|---|---|
| Triggers show as buttons | Non-X input mode. | Restart holding X + Start to enter X mode; triggers then report as analog axes. |
| Wrong startup mode each time | 8BitDo pads remember the last mode's power-on combo. | Always power on with the X-mode combo (X + Start). If the layout is off, that combo is the fix. |
| Small stick drifts | Compact potentiometer wear. | Circularity test — the small sticks exaggerate off-centre traces, so read the deviation percentage rather than the visual alone. |
Testing tip: This pad has no analog stick click on some firmware — if L3/R3 don't register, verify against 8BitDo's spec for your revision before assuming a fault.