CryptPad

CryptPad is an open-source, self-hosted suite of collaborative tools. It allows multiple users to synchronize changes to documents in real time while ensuring that data remains private through encryption. The software is deployed as a server-side web application and is accessible via a web browser, allowing teams to work together on shared content without relying on centralized proprietary infrastructure.

The platform focuses on privacy by encrypting data in the browser before it is transmitted to the server or other collaborators. This architecture ensures that server administrators and potential attackers cannot access the content of the documents, as the database only holds encrypted data. Users can deploy the software on their own infrastructure using official Docker images for AMD64 and ARM64 architectures or via manual installation guides for development and production environments.

Key features

• End-to-end encryption for all collaborative documents and files
• Real-time synchronization of changes between multiple users
• User registration and account access based on cryptographic keys
• Support for collaborative document editing and file sharing
• Deployment options via official Docker images
• Integration with Weblate for community-driven translations
• Protection against script injection in documents and uploads

CryptPad is developed by XWiki SAS and is licensed under the GNU Affero General Public License. The system is designed to minimize the amount of data exposed to operators, as the server does not store plain-text usernames or passwords. To further enhance anonymity, the software can be accessed via the Tor browser to prevent the recording of IP addresses. It is intended for individuals and organizations that require collaborative productivity tools without compromising data confidentiality to a service provider.

This software serves as a privacy-centric tool, prioritizing user data sovereignty over centralized control.