Dec 2, 2025 · FreeFileSync is a free open source data backup software to compare and synchronize files and folders on Windows, macOS, and Linux.

Download the newest FreeFileSync for local installation and FreeFileSync portable for use on USB sticks.

FreeFileSync is designed for local installation and provides the best user experience in this variant. In order to support restricted scenarios, the FreeFileSync Donation Edition includes …

Note For detailed instructions on setting up common synchronization scenarios, check out the FreeFileSync video tutorials.

These short tutorials will show you how to get the most out of FreeFileSync, including comparing folders, backing up your files, and analyzing your hard disk via a tree size view.

FreeFileSync is a graphical file synchronization and folder comparison tool. This means that its main purpose is to speed up backup operations by examining the differences between source …

Fixed setting modification times on certain storage devices (Windows) Fixed bogus "Sound playback failed" error message (macOS) Fixed rename dialog text selection wobble (macOS) …

RealTimeSync does not require you to start FreeFileSync. It can also be used in other scenarios, like sending an email whenever a certain directory is modified.

By default, FreeFileSync uses a single GlobalSettings.xml file containing options that apply to all synchronization tasks; for examples, see Expert Settings. If you want FreeFileSync to use a …

FreeFileSync compares two folders by analyzing the relative paths of the files they contain, i.e. the paths relative to the base folder pair. If the relative path matches, FreeFileSync decides …