FreeFileSync is a folder comparison and synchronization software that creates and manages backup copies of 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.
NOTE:
FreeFileSync allows you to open files in external applications or run custom scripts. However, when sandboxed as Flatpak, external applications or scripts from your host system are not accessible. If you want to give FreeFileSync access to your host applications/commands, run this command in terminal to give it access to your session DBus:
flatpak override --user --socket=session-bus org.freefilesync.FreeFileSync
(Or you can use Flatseal to configure this permission).
Now you can run any app/command, if you prefix it with "flatpak-spawn --host", i.e.:
flatpak-spawn --host mycommand arguments
Screenshots
Observed history
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Release notes supplied by the developer. These dates are not Flathub package publication times.
14.129 Sept 2026
- Further reduced size of database files by 16%
- Improved toggle button layout calculations
- Fixed grid view filters not showing (Linux)
- Fixed text descriptions not wrapping
- Work around ERROR_UNTRUSTED_MOUNT_POINT
- Fixed bitmap buttons being shrinked (macOS)
14.1110 Aug 2026
- Fixed "TLS session resumption required" FTP error
- Log file time errors as "info" after comparing by file content
- Fixed tooltip not being updated during mouse scrolling (macOS, Linux)
- Fixed sluggy mouse scrolling during mouse movement (Linux)
- Skip ADS when failing to copy to ReFS (Windows)
- Updated translation files
14.1028 Jun 2026
- Added CRC32 verification for application resource files
- Improved error reporting when application files become corrupted
- Fixed access denied error for Windows SFTP server
- Updated toolchain and library dependencies to latest versions
14.929 Mar 2026
- Support 200% display scaling for high-DPI monitors (Linux)
- Trimmed text-to-image bounding box
- Improved center grid tooltip (macOS, Linux)
- Work around "getcwd() failed" for console execute (Linux)
- Fixed calculating main window size and position on exit
- Fixed multi-folder-pair horizontal sizing glitch
- Fixed Donation Edition incorrect activation count (Linux)
- Fixed error during log file cleanup when running multiple FFS instances