Aitum Vertical setup, and the fastest way to fill the dock

Updated August 2026. About a 5 minute read.

Aitum Vertical is the free OBS plugin most streamers use for Twitch Dual Format. It adds a second vertical canvas with its own scenes, its own preview, and its own outputs. Installing it takes five minutes. Filling it with good vertical scenes is the actual work, so this guide covers both.

Install

1. Grab the latest release for your OS from the plugin's page. Search for "Aitum Vertical"; the project is called obs-vertical-canvas on GitHub and it's listed on the OBS forums too. Run the installer, or drop it into your plugins folder.
2. Restart OBS. A dock called Vertical appears. If you've hidden docks before, it's under View, then Docks.
3. Open the dock's gear menu. Set the canvas to 1080x1920 if it isn't already, and pick the Twitch preset for Dual Format streaming.

The dock has its own scene list, and your main scenes don't show up in it. The vertical canvas is a separate world.

The empty dock problem

Out of the box you have zero vertical scenes. Building them by hand means adding a scene in the dock, re-adding your camera, resizing it for 9:16, then doing the same for gameplay, alerts, and labels, then repeating all of that for every scene you stream with. Budget an hour for a five-scene setup, most of it spent dragging things and second-guessing sizes.

Two things make hand-building less painful if you go that route:

• Sources are shared. The vertical canvas reuses your existing camera and capture sources, so you're rearranging, not recreating. A filter change on your camera shows up in both formats.
• Scene linking exists. Link a main scene to a vertical scene and the dock switches automatically when you switch main scenes. Set this up for every pair, or your vertical feed will sit on the wrong scene mid-stream.

The fast way: convert what you already have

SceneFlip is free and runs in your browser, and it builds the vertical scenes from your existing layout in one pass.

1. In OBS: Scene Collection, then Export. That's a .json copy of your scenes, and your live setup stays untouched.
2. Drop the file on SceneFlip. It rebuilds every scene for 9:16: facecam to the top zone, content full width in the center, alerts overlaid on the content, chat hidden since Twitch mobile draws its own. You get a before-and-after preview plus a written list of every change.
3. Download the result, then in OBS: Scene Collection, then Import, and switch to the imported copy. The vertical scenes are already attached to the Aitum Vertical canvas, and the scene links are pre-wired, so auto-switching works immediately.

Treat the dock's scenes as a starting point after that. Nudge the camera, unhide anything SceneFlip tucked away. It hides rather than deletes, and the report says what and why.

Streaming both formats

With scenes in place, main OBS streams horizontal like always, and the Vertical dock handles the vertical output, either with its own start button or riding Twitch's Enhanced Broadcasting so both renditions share one session. Enable Enhanced Broadcasting in your Twitch dashboard, start both, and check the mobile app. You should see your vertical layout full screen with Twitch's chat over it.

If frames drop, remember you're encoding two streams now. Cap the vertical canvas at 30fps in the dock settings or lower its bitrate. Phone screens are forgiving.

SceneFlip is free and runs entirely in your browser. Your scene collection never leaves your machine.