croc

croc is a command‑line utility that enables secure, direct transfer of files and folders between any two computers. It operates through a relay service, eliminating the need for a local server or port‑forwarding, and supports both IPv6 and IPv4 with automatic fallback. Transfers are protected by end‑to‑end encryption using password‑authenticated key exchange, and the tool can resume interrupted transfers and handle multiple files in a single session.

The program is cross‑platform, running on Windows, macOS, Linux, and other Unix‑like systems, and can be installed via package managers, Docker, or by building from source. It also works through proxies such as Tor, providing flexibility for users in restricted network environments.

croc is intended for anyone who needs a simple, reliable way to move data between machines without configuring network services, from developers and system administrators to casual users who prefer a terminal‑based workflow.