FreeFileSync is a folder comparison and synchronisation tool providing highly optimised performance and usability without a needlessly complex user interface. According to the author, it is optimised for high performance and ease of use. It provides support for Unicode and can perform synchronisations at preset time intervals.

In addition to the Windows version is FreeFileSync available for Mac OS X, Ubuntu, Fedora, Suse Linux, and Debian. The Windows version attempts to install further tools (currently, PasswordBox), but this option can be disabled.