What it does
FreeFileSync compares source and target folders and synchronizes their contents on Windows, macOS and Linux.
Choose the left and right folders, compare them, set the synchronization rules, then start the transfer. FreeFileSync can work with multiple folder pairs and includes filtering, content comparison and versions of deleted or updated files. Set those rules before automating a batch job, since synchronization can propagate deletions. The Standard and Donation editions are for personal use by private individuals. Commercial use, including by an individual, and use by organizations requires the Business Edition. The software runs on Windows, macOS and Linux.
Strengths
- Comparison precedes folder synchronization
- Available across three desktop operating systems
Best for
- Maintaining a second working copy of a folder
Sources
- FreeFileSync: Open Source File Synchronization & Backup Software (Oct 26, 2026)
- Frequently Asked Questions - FreeFileSync (Oct 26, 2026)