Syncthing is an open-source continuous file synchronization program written in Go that enables users to synchronize files across two or more computers in a peer-to-peer architecture without relying on centralized servers. The project prioritizes data protection above all else, with explicit goals centered on preventing data loss and securing files against unauthorized access or modification. Security and ease of use form the foundation of the project's design philosophy, followed by automation that minimizes required user interaction and universal availability across common computing platforms.
The project's contributor base overlaps significantly with major technology repositories including Microsoft's VSCode, the Rust language project, and TypeScript, suggesting Syncthing attracts developers with experience in large-scale systems and cross-platform development.
Syncthing's design emphasizes individual empowerment through decentralized file sharing, positioning itself explicitly for personal users rather than enterprise deployments. The software runs on Windows, Mac, and Linux with multiple GUI implementations available, and can be deployed in Docker containers for flexible deployment scenarios. Building from source requires only running go run build.go, with binaries created in the ./bin directory, and the project provides comprehensive documentation and getting started guides.
The project takes security seriously with a dedicated security reporting process through [email protected], separate from public issue tracking. Release binaries are GPG signed with keys available from the project website, and the software includes a built-in automatic upgrade mechanism using compiled ECDSA signatures. macOS and Windows binaries receive additional code signing. All code is licensed under the Mozilla Public License v2, making it freely available for use and modification while maintaining copyleft protections.
