FreeFileSync

FreeFileSync unofficial website

Synchronize Files and Folders
Key featuresFreeFileSync 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, macOS, and Linux.
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Update News(2025-02-19)
Jan 17, 2025
Download the new FreeFileSync version 14.0 from the official homepage:
Latest changes:
  • • Dark mode support (Windows 10 20H1, macOS 10.14 (Mojave), Linux)
  • • Fixed dock icon progress percentage divergence (macOS)
  • • Prevent "App Napp during comparison/synchronization (macOS)
  • • Enhance EINVAL error message for unsupported characters
  • • Support running with background priority (Linux)
  • • Fixed installer access denied when creating shell links (Windows)
  • • Improved size and date formatting for file listing (macOS)
  • • Improved context menu customization grid
  • • Reduced peak memory consumption by 12%
  • • Automatically set appropriate text color for config panel background
  • • Revived and updated Italian translation
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Update News 2025
Update News before 2025
User Reviews
By far the best and most flexible file sync software I have come across. Allows for customization. The only software I know that allows you to only sync files that exist already in both source and destination folders. This feature comes in handy to do versioning.
— Kris N
A good software that deserves all possible support. Useful, easy and reliable. It's worth it, completely. My total support.
— Alik
What an excellent piece of software. Initially deployed as an experiment, has turned into a staple in my toolbox. I have it set up for an hourly mirror sync via Task Scheduler and it has proven itself time and time again. Nearly three million files synced, hourly revisions are kept on another drive and then compressed monthly... this is one beautiful piece of software. Thank you so much.
— iamvii
Thanks for the program! Exactly what I was looking for and better than I expected! Cheers.
— Albert Young
Amazing program! I love it and use it every day. Thank you for such a useful and powerful utility. I couldn't run my photography business without it. I make sure all my important files are backed up and it allows me complete control over what gets copied over and when. It's saved me a number of times. Thanks again.
— Justin Hoch
Was using Unison, but there weren't many updates and it doesn't support x64. FreeFileSync is very simple to use! Also it is much faster than Unison! I recommend it!
— geek-man
I got a similar app from PC Magazine a few years ago. I never really figured out how to use it. I tried to start it up and it would not load for reasons unknown. I googled just in case I might stumble across... THIS! It did precisely what I wanted to do. I figured out how to operate it pretty darned quick, which is a testament as I'm gettin' old and am not as fast on the uptake as I once was.
— chinnboy m.
It has become my preferred sync and backup program meanwhile. Keep on developing and improving!
— Frank Nitsche
After successful tests, i permanently installed the program with 6 TB of data exchanged between 2 x 3 hard disks (12 TB total) and it since works reliable and fast. It's even better than the best commercially available software, so there goes a big THANK YOU to the fantastic programmers and the GNU open source community & last but not least to sourceforge!!
— weathercontrol
I've been using this utility for more than a year now and still recommend it!
— Caspar Schutte
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