FreeFileSync for Windows
FreeFileSync is a folder comparison and synchronization application. This independent Windows guide explains how to choose a synchronization mode, preview changes, protect recoverable versions, and verify the destination instead of treating synchronization as a one-click backup.
Download for WindowsStart with a comparison
Select a left and right folder and run Compare before making changes. The grid shows new files, changed files, conflicts and planned deletions. Confirm the folder identities and action arrows before selecting Synchronize.
Choose the right synchronization mode
Update keeps extra destination items, Mirror can remove them to match the source, and Two Way tracks changes on both sides with a database. No single mode is safest for every workflow.
Windows workflows
- Back up to an external drive
- Synchronize with a NAS
- Schedule a reviewed batch job
- Verify backup results
- Resolve access-denied errors
Independent editorial scope
This website is not the developer’s official site. Product details are checked against developer and Microsoft documentation, while procedures are tested independently on Windows. FreeFileSync is developed by Zenju; editorial content on this domain is written by the FreeFileSync.app Editorial Team.
Browse all guides
The FreeFileSync Windows guides hub contains 45 focused articles covering setup, synchronization modes, storage, automation and troubleshooting.