User Interface

User Interface

Mountain Duck runs in the status bar (macOS) and taskbar (Windows).

Send Command

Find the mounted volume in Finder. Choose Go → Computer or choose Finder → General → Show these items on the desktop: Connected servers to make it appear on your desktop.

Auto start

You can choose to automatically open Mountain Duck when logging in. Refer to Preferences. Re-opening the application will open previously mounted volumes. If you choose Enable Login Item and Save Workspace in Preferences → General and do not manually eject the volume prior to reboot it will reconnect after login.


Choose Open Connection… to add a new bookmark or → Edit Bookmark to change properties.

Share Bookmarks with Cyberduck

Bookmarks are shared between Cyberduck and Mountain Duck.

Send Command Send Command



Version 4.0 or later required.

Assign multiple labels to bookmarks. Bookmarks are grouped in folders in the status bar menu by their assigned labels.

Send Command

Connect Mode

  • Online: Do not synchronize any file to your computer. You can only access this volume when a connection is possible to the server or cloud storage. Files are accessed on demand from the remote when opened and do not take up any local disk space.

  • Smart Synchronization: Files opened are made available for later offline access. You can explicitly make files available offline using the context menu.

Read-Only Volume

Select Options: Read Only in the bookmark to mount the volume as read-only and disallow any write operations on the remote disk.

Drive Letter (Windows)

Always assign the same drive letter to the mounted volume.


The number of concurrent connected bookmarks is limited by the number of available drive letters. You can have a total of 26 drives on your system.



Version 4.4 or later required.

You can search for bookmarks with the filter input field in the menu. Bookmarks not matching the input are greyed out.

Send COmmand

Bookmark Status

The bookmark can show three different status lights:

  • No light: No current connection to this bookmark.

  • Green light: You’re currently connected to this bookmark. The bookmark is completely synced and idle.

  • Orange light: You’re currently connected to this bookmark. There is at least one active process.


Screenshot Windows Mountain Duck

Choose → Connect to mount the server as a volume in the on macOS or the File Explorer on Windows. You can connect to multiple servers and have several volumes mounted. All operations on the remote files and folders can then be performed like on local files.


You can just select the menu item with the bookmark name to connect, too. If you are already connected, selecting the menu item will reveal the volume in

Connnect Using the Command Line Interface

You can mount volumes using your command-line interface (CLI) by opening a bookmark file.

Use open -a ''Mountain Duck'' ~/Library/Group Containers/ Support/duck/Bookmarks/*.duck in


Send Command

Notifications of the connection status are posted to the Notification Center of the operating system.

  • Filesystem mounted

  • Filesystem unmounted

  • Errors: If there is a network connectivity issue while the remote server is mounted, an alert is displayed that allows you to retry the connection or disconnect and unmount the volume.

  • Sync Notifications


Choose → Disconnect to unmount a volume. Alternatively, eject the volume in or File Explorer

Choose File → Eject in for the selected volume or control click to choose Eject.

Disconnect using command line
You can unmount volumes using your command-line interface (CLI). Use umount <bookmark nickname> in

Copying Files

Drag files in an macOS or File Explorer on Windows to move and copy files. You can also access the mounted volume with any other application and command-line interface.

Copy Operation Mountain Duck Finder Copy Operation Mountain Duck File Explorer

Context Menu in Finder and Windows File Explorer

A context menu in Finder on macOS and File Explorer on Windows allows various actions on files.

Send Command

Sync Options

Keep Offline on Local Disk or Delete on Local Disk to manage caching status. Refer to Sync Options


Changes from the server are not immediately visible. The directory listing in may become out of date when another application is adding, removing, or modifying files on the server. Choose Reload from the Finder Extension Menu. On Windows, you can force File Explorer to refresh the directory listing with F5.

Enable the Index Files option in Preferences → Sync to allow new files on the remote storage to be detected periodically.


  • Create Download Share: Create an URL to share with someone else to allow downloading the file or folder.

  • Create Upload Share: Create an URL to share with someone else to allow uploading files to the selected folder.

Right-click files on a mounted drive will open a menu with items to copy & open HTTP URLs or create share links of files. This will include the Origin URL, HTTP URLs and temporary signed URLs in S3.

  • Copy URL

  • Open URL

Read more about sharing options.

Send Command


Quick Look or Restore previous versions of documents on servers supporting versioning. Read more about versioning.

New Bookmark

Right-click on white space within the mounted drive in Finder or Explorer to add a bookmark including the selected path.

Open in Terminal

Right-click on a folder and choose Open in Terminal to open an SSH connection to the server in Terminal for SFTP bookmarks.


This feature is not supported in the version available in the Mac App Store.

Info Panel

Right-click on a file and choose Info to change permissions, ACLs, metadata, and other service provider-specific settings on a file. Refer to Info Window.

Send Command Send Command Send Command Send Command

New Encrypted Vault…

Create a new Cryptomator Vault. Read more about client-side encryption.

Lock/Unlock Vault

Lock or unlock a Cryptomator Vault.

Usage Scenarios

Mirror Files to Remote Server or Cloud Storage with rsync

Use rsync or any other of your preferred tools to mirror files for example to an S3 bucket. Set the --timeout=TIME option in rsync (in seconds) if you have low bandwidth or high latency connection.

Open Remote Files in Text Editor

Sublime Text and other editors allow you to open folders to work on multiple files.

Create ZIP Archive of Files on FTP Server or Cloud Storage

Use your preferred archive utility to create a compressed archive of files already stored on the server.