MiiStudioMiiLoader

Mii Studio Mii Loader

Import and export Miis from Nintendo’s online Mii Studio, using Mii Studio codes.

Code originally written by HEYimHeroic. Browser extension by jonbarrow and Kestron06. Bookmarklet polished by bendevnull.

Browser Extension

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The Mii Studio Mii Loader can be used through a regular browser extension. Head to Nintendo’s official Mii Studio site. (You may have to enter the site via the My Nintendo site first. Make sure you’re signed into your My Nintendo account.) Make sure that you’re not making a new Mii. If you are, save the new Mii, and go back to edit it again.

Clicking on the extension with a Mii loaded will display its Mii Studio code, ready to be copied. If it doesn’t work, make a change to the Mii (you can immediately revert it) and the Mii Studio code should be there. This should automatically update as you edit the Mii.

To load a Mii Studio code, begin editing a Mii the same way as before, but now when clicking on the extension, enter a Mii Studio code into the textbox below it and click “Update Mii Studio Data”. Then, refresh the page, and click “Continue editing” in the website for your Mii to appear. (Hitting “Start from scratch” will reset the process.)

New Features

Thanks to a huge overhaul from Kestron06, the Mii Studio Mii Loader browser extension now has several new features. The Mii Studio code can now be copied with a single click, along with Base64 encode support. Additionally, the extension can also convert Mii data file formats, allowing imports and exports of .mnms (My Nintendo Mii Studio data), .charinfo (Switch/2), .nfcd/.nfsd (Switch/2), .png and .jpg (for ver3 QR codes), .cfcd/.cfsd/.ffcd/.ffsd (3DS/Wii U/ver3), .rcd/.rsd (Wii), and .ncd/.nsd (DS) files.

All can be imported and converted into a Mii Studio code instantly, and all can be exported by the extension converting the Mii Studio code into the respective data. It’s now easier than ever to manage your Miis in the Mii Studio!

Please note that when converting to Wii/DS and ver3, certain features available in the Mii Studio may not be supported by those formats, and thus will be converted to something similar.

Installing the Browser Extension Manually

To manually install this browser extension, follow these steps:

  1. Download the latest release of the Mii Studio Mii Loader browser extension. Unzip the download to a location you won’t lose it, like an extensions folder.
  2. Go to your browser’s extensions settings page. For example, on Google Chrome, the link is chrome://extensions/, but otherwise accessible through settings for other browsers.
  3. Find the “Developer mode” option (or something similarly named) and enable it.
  4. Click the button to “Load unpacked extension” and navigate to the folder you unzipped (the contents should contain manifest.json, /popup/, /images/, etc.). Choose this folder as the unpacked extension’s location.

Bookmarklet Instructions

For those still unaware of the browser extension, or for one reason or another need to use the bookmarklet instead, the old bookmarklet version of the tool is still available. Below are the old instructions for that:

Make a new bookmark, and paste the following JavaScript code into the URL section of the bookmark: javascript:(function () {var s = document.createElement('script');s.setAttribute('src', 'https://heyimheroic.github.io/MiiStudioMiiLoader/miiLoader.js');document.body.appendChild(s);}());

Once there, head to Nintendo’s official Mii Studio site. (You may have to enter the site via the My Nintendo site first. Make sure you’re signed into your My Nintendo account.)

Click on a Mii, click “Edit”, and click the bookmark you just made. (Make sure that you’re not making a new Mii. If you are, save the new Mii, and go back to edit it again.)

Follow the instructions given to you in the popup box’s prompt.

If you are loading a Mii, refresh the page, and select the button to continue editing the Mii. The Mii will transform into the Mii you’re attempting to load.

You can read more about the specifics on using the tool at the Mii Library.