Syncthing File Synchronization

Syncthing is a continuous file synchronization program that enables real-time, peer-to-peer file sharing between two or more computers without relying on any central server or cloud service. The software prioritizes privacy and security: all communication is encrypted using TLS with perfect forward secrecy, and every device is identified by a strong cryptographic certificate that prevents man-in-the-middle attacks. The decentralized architecture means users retain full control over their data, as files are transferred directly between devices over the local network or Internet without passing through any intermediary. Syncthing runs on macOS, Windows, Linux, FreeBSD, Solaris, and OpenBSD, making it truly cross-platform. The tool offers powerful features including selective sync to choose which folders to share with each device, file versioning to keep historical copies of changed files, ignore patterns for filtering files, and automatic conflict resolution when the same file is modified on multiple devices simultaneously. Configuration and monitoring are handled through a clean web interface accessible from any browser. Syncthing supports UPnP for automatic port forwarding, relay servers for connections through difficult network topologies, and global discovery for finding peers across the Internet. Fully open source under the MPL license with no telemetry or tracking, Syncthing has become the go-to solution for privacy-conscious users and organizations needing reliable, serverless file synchronization.