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Download Cyberduck

This client is available for macOS and Windows at

Creating a config

The main window will show "bookmarks" unless you are connected to somewhere, and in the lower left corner, press the + sign to add yet another one.

Add config

Enter the host part of the URL for your account in the Server field and fill in your access_key. CyberDuck will prompt for the secret_key at first connect and store it in the system keyring.

Create config


Cyberduck defaults to a using multiple connections and chunked transfers, so there isn't a lot of buttons to twist for performance reasons. It can also sync folders, and it has nice menu choices to select Show me HTTPS url for this file (don't ask for HTTP, that will not work on our S3 setup) if you want to share an URL to a publicly readable file.

If creating or accessing buckets fail

Cyberduck can be set to use path-based URLs for buckets, which some of our endpoints prefer, and if you log in successfully but cannot operate on buckets, please set this property for Cyberduck and then restart the client:

s3.bucket.virtualhost.disable true

For Mac users, run this command

defaults write ch.sudo.cyberduck s3.bucket.virtualhost.disable true

For Windows users, edit/create this file


and add this line to it:


After restart the bucket operations should work as expected.

Setting ACLs on files

Select the file and choose Info from the File menu (keyboard shortcut: Opt-I) or the cogwheel. Then add or remove permissions as you see fit.



There is an addition called Mountainduck ( which uses your Cyberduck preferences and allows you to mount one or more of the configured endpoints as a mounted drive. (In my case, the DC1-S3 'drive' on the left)