FreeFileSync Open Source File Synchronization

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Synchronize Files and Folders

Key features
FreeFileSync is a folder comparison and synchronization software that creates and manages backup copies of all your important files. Instead of copying every file every time, FreeFileSync determines the differences between a source and a target folder and transfers only the minimum amount of data needed. FreeFileSync is Open Source software, available for Windows, Linux and macOS.


FreeFileSync 10.3
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Latest News

Aug 7, 2018
FreeFileSync 10.3 has been released!
Jul 16, 2018
Parallel file copy and ad-free installer
Jun 11, 2017
FreeFileSync Video Tutorials available
May 24, 2017
FreeFileSync adds Support for FTP and FTPS
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User Reviews

It works very well. I sync a whole folder located on my note, including a local *.pst from outlook to flash drive.
Leonardo Dias
This has been my goto file sync tool for years. It's an A+ piece of software!
Jeff Reed
I have been searching (for a long time up to about 2 years ago when I found FreeFileSync) for a utility that does this, even contemplated creating my own. FreeFileSync is a one stop solution that does it all, and does it the way I expect it to. And its versatile and user friendly enough to compare files produced by the engineering tools I use. I've even used it to check disk transfer speed in real life scenarios, works like an absolute charm.
It really became a tool I use extremely often, it's one of my must have's like 7zip. It beats "Unison" hands down for user friendliness and speed to install and get on systems. It beats the tool "Beyond Compare" hands down because it's open source and freely available, but I have to say, I'd love the "Beyond Compare" capabilities, but I cannot justify its cost. FFS does enough for me that I can do without it.
Chris Bosch
It's a very good program! Very useful! Thank you for creating this program. From South Korea
Kim Han