FTP/FTPS is the trusted workhorse of the file transfer family of protocols. As a non-secure transfer protocol, FTP has largely been superceded by its secure cousin, FTPS. FTPS is built on the universal TLS standard for secure networking, meaning files cannot be eavesdropped upon during the transfer process, even if it is across the Internet.

The usual capabilities and configuration settings are supported, such as resuming of transfers, active and passive modes, and implicit and explicit FTPS. Admins can also permit or ban anonymous logins, set an external IP address for passive transfers, and apply the appropriate port range for those data connections. Individual users can be permitted or denied the use of FTP/FTPS.

FTP and FTPS are supported in all of the editions of CompleteFTP.