Use this tool to generate config file for 3DSync. Authenticate with Dropbox or Google Drive, configure your sync folders, then download the config file and copy it to your 3DS SD card at: /3ds/3DSync/3DSync.ini (create folders if not existing)
  • Authenticate with cloud service
    Dropbox
    Login with Dropbox
    or
    add_to_drive Google Drive
    Leave blank to use the root of My Drive. To scope to a subfolder, open it in Google Drive and paste the URL or just the ID — drive.google.com/drive/folders/THIS_PART
    add_to_drive Login with Google Drive

    In Google Cloud Console, create a project, enable the Drive API, and create an OAuth 2.0 Web application credential. Add https://vllni.github.io/3DSync/configurator.html as an authorized redirect URI. The refresh token is stored in the config so you won't need to log in again.

    To get the JSON file:

    1. Open APIs & Services → Credentials
    2. Click the name of your OAuth 2.0 Client ID to open it
    3. In the Client secrets panel, click + Add secret
    4. The new secret row shows a ↓ download icon — click it immediately (it disappears after you leave the page)
    5. Import the downloaded file with the button above, then disable your old secret
  • Configure folders to sync

    Presets

    Custom Paths

    Path — absolute path on the 3DS SD card to sync, POSIX style. Examples: /3ds/MyApp, /roms/nds

    Name — destination folder on your cloud storage. Use / to create nested folders. Examples: Saves, roms/nds, 3DS/Checkpoint

    Subdirs — when checked, all subdirectories are synced recursively and their structure is preserved on Drive (e.g. /saves/Game/001.sav becomes Name/saves/Game/001.sav). Uncheck to sync only the files directly inside the specified folder, ignoring subdirectories entirely.

    Both ways — full bidirectional sync. The 3DS compares each file against a local manifest (/3ds/3DSync/manifest.json) and against the Drive copy, then uploads, downloads, or prompts for conflict resolution as needed.
    Upload only — one-way upload to Drive (no downloads, no manifest). Useful for backups or Dropbox paths.

    If Name is left empty the files go directly into the root Drive folder (or the Folder ID you configured).

    add


    Back Confirm
  • Download config file
    Back Download