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Cyberduck is a libre FTP, SFTP, WebDAV, Amazon S3, Backblaze B2, Microsoft Azure & OneDrive and OpenStack Swift file transfer client for Mac and Windows.


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This is the development home for Cyberduck, a libre file transfer client for macOS and Windows. Command line interface (CLI) for Linux, macOS and Windows. The core libraries are used in Mountain Duck.

Cyberduck Icon

Mailing Lists

There is a Google Groups Cyberduck discussion mailing list.

The following additional mailing lists are hosted:

  • News Announcements of new releases
  • Localization Notifications about changes to the translations needed


Source code is available licensed under the GNU General Public License Version 3. Pull requests welcome!


Translations to new languages are welcome. We use Transifex to localize resources. Current available localizations are English, Czech, Dutch, Finnish, French, German, Italian, Japanese, Korean, Norwegian, Portuguese, Slovak, Spanish, Chinese (Traditional & Simplified Han), Russian, Swedish, Hungarian, Danish, Polish, Indonesian, Catalan, Welsh, Thai, Turkish, Hebrew, Latvian, Greek, Serbian, Georgian and Slovenian.

Make sure to subscribe to the localization mailing list.


For general help about using Cyberduck, please refer to the documentation. The documentation is maintained in its own repository.

Additional Connection Profiles

Additional connection profiles not bundled by default but available in Preferences → Profiles are maintained in its own repository.

Snapshot and Beta builds

These are nightly snapshot builds from the current development trunk featuring the latest bug fixes and enhancements. Be warned, though, these builds are potentially unstable and experimental. You can also switch to beta or snapshot builds in Preferences → Update.


  • Java 11 SDK or later
  • Apache Ant 1.10.1 or later
  • Apache Maven 3.5 or later





  • Visual Studio 2022, following workloads are required:
    • .NET desktop development
    • Universal Windows Platform development
    • Desktop development with C++
  • Bonjour SDK for Windows
  • Wix v3 (Optional)


Without Visual Studio (IDE)

choco install visualstudio2022buildtools -y
choco install visualstudio2022-workload-manageddesktopbuildtools -y
choco install visualstudio2022-workload-vctools -y
choco install visualstudio2022-workload-universalbuildtools -y

With Visual Studio IDE

choco install visualstudio2022(edition) -y
choco install visualstudio2022-workload-manageddesktop -y
choco install visualstudio2022-workload-nativedesktop -y
choco install visualstudio2022-workload-universal -y

Replace (edition) with your licensed IDE SKU: community, professional, enterprise

Install required dependencies, after installing Visual Studio IDE or build tools:

choco install microsoft-openjdk17 ant maven -y
choco install bonjour -y; choco install bonjour -y --force

Optional, see Remarks:

choco install wixtoolset -y

Remarks: Installing with Chocolatey may or may not fail spectacularly.
Following issues have been observed on a clean installation:

  • Bonjour package fails with file not found - though the Bonjour64.msi is extracted from BonjourPSSetup.exe.
  • wixtoolset depends on .NET 3.5-package, which never completes
    On Windows 11 installation doesn't work
  • visualstudio*-workload-* may halt with "Operation canceled",
    Abort Chocolatey-command (Ctrl-C), then open up Visual Studio Installer and Resume installation there

Restart your machine after installing these components.

System Configuration

Make sure that MSBuild, mvn, ant and java are on your PATH-environment variable.

  • Open Developer Command Prompt for VS2022, then run where msbuild.exe, add first directory name to path
    • e.g. C:\Program Files\Microsoft Visual Studio\Community\Msbuild\Current\Bin\amd64
  • Chocolatey may have added mvn and ant to your PATH-variable
  • The Microsoft OpenJDK 17 installer automatically adds itself to the system PATH.

Additionally include the latest Windows Sdk-binary folder in your PATH-environment variable:

  • %ProgramFiles(x86)%\Windows Kits\10\bin\10.0.<Latest>.0\x64


Run mvn verify -DskipTests -DskipSign to build without running any tests and skip codesign. Find build artifacts in

  • osx/target/
  • windows/target/Cyberduck.exe

Run with -Pinstaller to build installer packages with build artifacts

  • osx/target/release/*.(zip|pkg)
  • windows/target/release/*.(exe|msi)
  • cli/osx/target/release/*.(pkg|tar.gz)
  • cli/windows/target/release/*.(exe|msi)
  • cli/linux/target/release/*.(deb|rpm)


You will run into warnings from MSBuild/WiX that are unrelated to how Cyberduck is built. You may safely ignore them.



Edit setup/app/Info.plist if you want to debug or setup/pkg/Info.plist if you want to debugduck respectively. Add -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:5005 in VMOptions to allow to connect to the running application in your IDE by attaching to the remote JVM.


Due to Visual Studio not being able to handle Java projects it is required to follow these steps for debugging:

  • Run mvn verify -Dconfiguration=debug which ensures that debugging symbols are generated This prevents Visual Studio (or MSBuild invoked from Maven) from generating optimized assemblies which in turn may prevent debugging.

  • Open the solution in Visual Studio

  • Open a .java file and set a breakpoint. Visual Studio breaks either on or near the line selected.

  • Debugging capabilities include

    • Step Over
    • Step Into
    • Step Out
    • Continue
    • Local/Auto variables
    • Immediate Window

    Go To Symbol is not working due to missing Java support.

Running Tests

After packaging, run mvn test -DskipITs to run unit tests but skip integration tests.

Maven Artifacts (GPL)

Repository Configuration

Maven artifacts are available in a repository hosted on Amazon S3.

  • Use the following Maven configuration in your project POM to reference artifacts from Cyberduck
  • You will need to add the AWS Maven Wagon to your build using


  • Protocol implementations
  • Cocoa Java Bindings (macOS)
  • Implementations (macOS) using Launch Services, SystemConfiguration, Foundation, Keychain and other API



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