Your Steam Deck Is Now a Bluetooth Controller, Thanks to Decky

The Steam Deck has been a PC, an emulation vault, and a portable indie machine. The modding scene now wants it to be a spare controller, too. A new Decky Loader plugin lets the Deck broadcast itself over Bluetooth as a standard gamepad, so you can pair Valve’s handheld with another device and use it purely as an input surface.

It joins the growing pile of Decky add-ons — like the plugin that streams your heart rate to the Deck’s screen — that quietly bend the Deck into shapes Valve never advertised. But unlike a lot of the novelty plugins, this one has an obvious, practical use that most homebrew tools don’t — and that’s exactly why it’s worth a look.

HID Mode: Your Deck’s Buttons, Rebuilt as a Generic Gamepad

Decky Loader has always been the connective tissue here — it’s the plugin framework that lets the community hang new features off SteamOS without touching the base image. This plugin uses that plumbing to flip the Deck from a Bluetooth host into a Bluetooth peripheral, exposing it to other devices as a standard HID gamepad. Your Deck already takes Bluetooth input from controllers; now it hands input back out.

Be realistic about what travels over that link, though. Generic Bluetooth HID is a low bar: sticks, face buttons, shoulders, D-pad. The Deck’s dual trackpads, back paddles, and gyro are its real differentiators, and those almost certainly don’t survive the trip across a generic gamepad profile. So don’t expect a perfect one-to-one clone of the Deck’s controls on the receiving device. The source hasn’t detailed latency figures or battery impact either — and both matter. Running a live radio broadcast while the APU sits idle still draws down the battery, and Bluetooth input latency is real. That’s fine for a half-hour couch session; it’s a worse fit for a marathon.

A Spare Pad You Already Own — and the Repurposing Trend

The obvious win is the living-room scenario every handheld owner eventually hits: a friend shows up, you’ve got one controller, and the couch co-op session dies on the spot. Pair the Deck instead. The same trick works when you want the Deck as an input device for a desktop, a phone, a tablet, or a retro box that accepts a standard Bluetooth pad. It’s a fallback controller you already paid for.

It also fits a wider pattern. SteamDeckHQ has flagged Decky experiments like turning the Deck into a PS Vita, and each one reinforces the same thesis: the Deck’s value isn’t just its specs, it’s how malleable it is — the same instinct behind SteamBoy’s Game Boy-style hardware mod. If you already run Decky Loader, this is a free install with a clear use case — grab it before your next local multiplayer night. If you’ve been putting off setting up Decky, a zero-cost spare controller is as good a reason as any to finally do it. Expect the community to keep pushing on this exact idea, too; trackpad and gyro passthrough over a custom protocol is the obvious next frontier, and the scene rarely stops at “good enough.”