croc is a command-line tool that allows any two computers to simply and securely transfer files and folders across networks.
The tool solves the problem of transferring files between distant machines without requiring the sender and receiver to set up local servers or manage port-forwarding. It uses a relay-based approach combined with password-authenticated key exchange (PAKE) to provide end-to-end encryption. The relay allows any two computers to connect regardless of their network configuration, while PAKE ensures that only parties who know a shared code can decrypt the transferred data.
The tool suits developers and users who need straightforward file transfers without infrastructure overhead. It works across Windows, Linux, macOS, and browsers, making it practical for cross-platform workflows. It supports multiple file transfers, resumable interrupted transfers, and can route traffic through proxies like Tor. The tool prioritizes IPv6 with IPv4 fallback. A browser version is available at getcroc.com for users who prefer not to install anything locally, and the browser and CLI versions are fully compatible with each other.
Maintainers respond to issues and pull requests within a day. Work in the issue tracker centers on bug fixes, enhancements, and managing inactive issues.
