MiiTuber

NOTE: Mii Creator(mii.nxw.pw) custom clothes currently do not work with Miituber.

Turn your Mii into a VTuber. MiiTuber shows your Mii as a live 3D avatar that copies your head movements from your webcam and moves its mouth when you talk, ready to drop into OBS with a transparent background.

Everything runs on your own PC. No accounts, no uploads, nothing sent anywhere.

Download

⬇ Download the latest release (Windows)

Download, run it, and follow the one-time setup below.

One-time setup: the Mii resource file

Miis are rendered using Nintendo's official Mii models and textures, which come in a single file called AFLResHigh_2_3.dat. MiiTuber can't include this file for copyright reasons, so you grab it yourself. It takes about a minute:

1. Download the file from the Internet Archive (it's from Miitomo, Nintendo's old mobile app): https://web.archive.org/web/20180502054513/http://download-cdn.miitomo.com/native/20180125111639/android/v2/asset_model_character_mii_AFLResHigh_2_3_dat.zip
2. Unzip it. Inside is a file named AFLResHigh_2_3.dat.
3. Open MiiTuber. The first time it runs, it will ask you to locate this file. Point it at the one you just unzipped and you're done. You won't need it again.

Already have this file from another Mii app (sometimes named ffl_hires.dat)? It's likely the same thing, so just select it when MiiTuber asks.

Getting your Mii

MiiTuber comes with a sample Mii so you can try everything right away. To use your Mii, you need it as a small data file. Pick whichever applies to you:

• Make one from scratch with Mii Creator, a free web Mii editor (joining their Discord is required to use it). Build your Mii, then export it as an FFSD (.ffsd) file, the format MiiTuber reads. Don't use the .miic export; MiiTuber can't open those.
• Had a Wii U or 3DS back in the day? If you remember your Nintendo Network ID, mii-unsecure.ariankordi.net has an archive of those Miis. Type your NNID and click Download .ffsd. (It's a free community site, so it's occasionally down.)
• Just want a ready-made Mii? MiiDataFiles has thousands of Miis from the community Mii Library, downloadable as files MiiTuber can open.

Then import the file in MiiTuber and it's saved to your library.

All supported file types

• .ffsd / .cfsd: Wii U / 3DS Miis (the most common and best-supported format)
• .mii, .miigx, .mae, .rcd, .rsd: original Wii Miis
• Mii Studio data from Nintendo's Mii Studio site
• Older .miic files from early Mii Creator versions (current .miic exports are not supported; export as .ffsd instead)

Adding your Mii to OBS

1. In MiiTuber, turn on transparent background. The whole MiiTuber window becomes see-through except your Mii.
2. In OBS, add a Window Capture source and select the MiiTuber window.
3. Your Mii now floats over your scene. No green screen needed.

Don't minimize the window while streaming. OBS can't capture a minimized window, so your Mii will disappear from your scene. It's fine if the window is hidden behind other windows or moved off to the side. Just keep it open, not minimized.

MacOS

MacOS users currently must build MiiTuber from source. Install Node.js 20+, the Rust toolchain, and the Xcode command-line tools, then run:

xcode-select --install
git clone https://github.com/njiedev/miituber.git
cd miituber
npm install
# Put AFLResHigh_2_3.dat in public/
npm run tauri build

Note that the transparent background feature does not work on MacOS. As a workaround, set MiiTuber's background to solid green, blue, or magenta, capture the MiiTuber window in OBS, and add OBS's Chroma Key filter to remove that color.

Bugs & feedback

Found a bug or have a request? Open an issue or reach out on Twitter: @3weeksbuilding.

Building from source

For developers. Regular users can ignore this. You'll need Node.js 20+ and the Rust toolchain.

git clone https://github.com/njiedev/miituber
cd miituber
npm install
# put AFLResHigh_2_3.dat (see above) in public/
npm run tauri dev

Architecture and contributor docs live in docs/.

License & credits

MiiTuber is open source under AGPL-3.0, built on the work of the Mii research community:

• FFL.js and FFL-Testing by Arian Kordi
• The FFL decompilation by AboodXD
• Mii Creator by kat21
• MiiDataFiles by HEYimHeroic

MiiTuber is a fan project. It is not affiliated with, endorsed by, or sponsored by Nintendo. Mii is a trademark of Nintendo. No Nintendo assets are distributed with this software.