Joy-Con test. Check Switch controllers in your browser.

A Joy-Con test in a browser reads the stick’s resting position as a number, which is the only way to separate real drift from a game that simply feels loose. Pair the Joy-Con to a computer over Bluetooth and the tool above reads it through the Gamepad API, the open W3C standard, with nothing installed and nothing uploaded.

How do you test a Joy-Con in a browser?

Detach the Joy-Con from the Switch and hold the small round sync button on the inside rail until the four lights run back and forth. Open your computer’s Bluetooth menu, add the controller from the list, then come back to this page and press a button so the browser registers it. Move the stick through its full circle and press each button in turn.

Everything is read inside your browser and nothing about your input leaves the machine. The pairing is the only part that takes patience: a Joy-Con still bonded to a Switch will keep reconnecting there, so hold the sync button long enough to break that bond first.

Why does a single Joy-Con get no automatic verdict?

Held on its own, a Joy-Con is used sideways. Its stick sits where a right thumbstick would not, and it exposes fewer axes than a full pad, so it does not match the standard layout the Gamepad API describes [2]. When the mapping is not standard, the browser hands over the raw axis and button arrays without saying which is which.

The tester deals with this honestly: it shows every live value and it withholds the drift label, because labelling an axis it cannot reliably identify would be a guess dressed as a measurement. You read the resting numbers yourself against the thresholds below, which is the same judgement the automatic verdict would make.

A Switch Pro Controller has no such problem. It reports the standard mapping, so every panel including the automatic verdict works exactly as it does for a DualSense or an Xbox pad.

What resting value counts as Joy-Con drift?

Set the Joy-Con down, take your hand off the stick, and read the axis values. The tool keeps per-family thresholds because idle noise differs by module, and the Joy-Con’s small module is the quietest of the four, which is why its thresholds are the tightest on the site. Drift is called only when at least 80 percent of a rolling window of 60 to 90 readings stays past the warn threshold.

The comparison is the useful part. A resting value of 0.12 is comfortably inside normal on an Xbox pad and close to failing on a Joy-Con. This is why a single number copied from a general stick-drift article tells a Switch owner very little, and it is the reason the stick drift explainer separates the bands by hardware.

Pairing a Joy-Con to a PC or a Mac

The sync button is on the flat inside rail, near the top, and it is deliberately small. Hold it until the lights chase along the rail, which signals pairing mode rather than a normal reconnect. Windows lists the pad as “Joy-Con (L)” or “Joy-Con (R)” and macOS shows the same names.

Each Joy-Con pairs separately. There is no browser-side way to fuse a left and a right into one virtual pad, so test them one at a time. If the controller connects and immediately drops, put the Switch to sleep or move it out of range: a docked console nearby will keep pulling the Joy-Con back. The Switch Pro pairing guide covers the Pro Controller’s own route, including USB-C.

What a browser test cannot see on a Switch controller

The Gamepad API covers buttons, axes and a basic vibration actuator. It does not carry gyroscope or accelerometer data, so motion aiming cannot be checked here, and Nintendo’s HD Rumble effects are not exposed either. Where a browser supports the haptic actuator, the tool can fire a plain pulse so you can tell a dead motor from a quiet one, which MDN documents per browser [3].

That boundary matters less than it sounds. Joy-Con faults are overwhelmingly stick faults, and the stick is the part the API reads best. If the sticks and buttons check out and the problem is motion control, the fault is more likely to be a game’s calibration than the hardware.

Repair, replace, or claim?

Read the number first, then decide. A resting value that drops after cleaning under the stick skirt was contamination. One that stays above 0.15 is a worn module, and a deadzone only hides it while the offset grows.

Nintendo handles Joy-Con repair requests through its regional support sites, and the terms differ by region, so start there before buying anything [4]. If you would rather do it yourself, the analog stick replacement guide covers the module swap, and the TMR and Hall-effect buying guide covers drift-resistant replacement modules.

For other hardware, the all-in-one controller tester reads any pad the browser can see, and the PS5, PS4 and Xbox pages are the device editions of this one.