ownCloud Core

ownCloud Core is the server-side component of ownCloud Classic, providing file storage, synchronization, and sharing trusted by over 200 million users worldwide. It includes WebDAV, CalDAV, and CardDAV servers, a plugin architecture for apps, user and group management, encryption support, external storage backends, and a comprehensive REST API. The server runs on PHP with support for MySQL, MariaDB, PostgreSQL, and SQLite databases.

Part of ownCloud Classic

This is the main repository for ownCloud Classic. It is the foundation that apps like Activity, Calendar, Contacts, and many others extend. The server is available as a Docker image on Docker Hub.

For the next-generation ownCloud platform, see ownCloud Infinite Scale (oCIS).

Getting Started

For installing ownCloud Classic, see the official installation manual.

Development Build Prerequisites

• Composer v2
• Yarn and Node.js (v14 or higher)

make

Documentation

• ownCloud Classic documentation
• Developer documentation
• CHANGELOG.md
• Conventional Commits specification

Community & Support

Star this repo and Watch for release notifications!

• ownCloud Website
• Community Discussions
• Matrix Chat
• Documentation
• Enterprise Support
• OSPO Home

Contributing

We welcome contributions! Please read the Contributing Guidelines and our Code of Conduct before getting started.

Workflow

• Rebase Early, Rebase Often! We use a rebase workflow. Always rebase on the target branch before submitting a PR.
• Dependabot: Automated dependency updates are managed via Dependabot. Review and merge dependency PRs promptly.
• Signed Commits: All commits must be PGP/GPG signed. See GitHub's signing guide.
• DCO Sign-off: Every commit must carry a Signed-off-by line:

  git commit -s -S -m "your commit message"
  

• GitHub Actions Policy: Workflows may only use actions that are (a) owned by owncloud, (b) created by GitHub (actions/*), or (c) verified in the GitHub Marketplace.

Translations

Help translate this project on Transifex: https://explore.transifex.com/owncloud-org/owncloud/

Please submit translations via Transifex -- do not open pull requests for translation changes.

Security

Do not open a public GitHub issue for security vulnerabilities.

Report vulnerabilities at https://security.owncloud.com -- see SECURITY.md.

Bug bounty: YesWeHack ownCloud Program

License

This project is licensed under the AGPL-3.0.

About the ownCloud OSPO

The Kiteworks Open Source Program Office, operating under the ownCloud brand, launched on May 5, 2026, to steward the open source ecosystem around ownCloud's products. The OSPO ensures transparent governance, license compliance, community health, and sustainable collaboration between the open source community and Kiteworks, which acquired ownCloud in 2023.

• OSPO Home: https://kiteworks.com/opensource
• GitHub: https://github.com/owncloud
• ownCloud: https://owncloud.com

For questions about the OSPO or licensing, contact [email protected].

License Migration to Apache 2.0

The OSPO is driving a strategic relicensing of ownCloud repositories toward the Apache License 2.0, following the Apache Software Foundation's third-party license policy.

Individual repositories will migrate as their audit is completed. The LICENSE file in each repo reflects its current license status (not the target).

Current license: AGPL-3.0 (Category X per Apache policy -- cannot be included in Apache-2.0 works).

Migration prerequisites for this repository:

• CLA/DCO coverage: All past contributors must have signed agreements permitting relicensing
• Copyleft dependency audit: All AGPL/GPL dependencies must be replaced or isolated
• KDE heritage review: Any code with KDE-era copyrights requires legal analysis
• Complete relicensing: AGPL-3.0 is a strong copyleft license; migration requires full relicensing of all files, not just a header change