Software · Backup & sync

FreeFileSync

Visual folder comparison and synchronization.

Free, with trade-offs
Windows, macOS and Linux
Open source

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Free, with trade-offsconfirmed by Flathub, Automatic reading of the official pages
Excerpt from freefilesync.org, read on 7 November 2026
e options fairly clear. — oid-2658093 flexible. does what it's supposed to do well. i switched from syncback (free version) to freefilesync because it handles a few important things better, e.g. copying locked files, more powerful filters. — oid-2864505 saved my life. now it takes me 30 sec Open the page
License: GPL-3.0 — Open source (copyleft)confirmed by Flathub, Wikidata
Open source: Yes
Commercial use: Yesconfirmed by Flathub, Official plan pages (pricing, licence, terms)
Account required: not documented
Credit card required: Noconfirmed by Flathub
Watermark: Not applicable
Ads: not documented
Platforms: Windows, macOS and LinuxEstablished by Linux: Flathub, Unspecified source · macOS: Homebrew, Unspecified source · Windows: Unspecified source, Wikidata
Publisher: Zenju
Latest version: 14.13 (26 October 2026)
Latest activity: 22 October 2026
Source code: github.com/feinstaub/freefilesync-pak.git

Overview

FreeFileSync is a backup program, available on Windows, macOS and Linux.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“FreeFileSync is a free open source data backup software to compare and synchronize files and folders on Windows, macOS, and Linux.” — official website, 10 November 2026
“FreeFileSync: Open Source File Synchronization & Backup Software” — official website, 10 November 2026

At a glance

FreeFileSync is free, with trade-offs (account, ads, data or attribution) detailed below.

Its licence (GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
Commercial use allowed

About

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

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Flathub (credit card, publisher, licence, free status, platforms, commercial use, version) — 10 November 2026
Facts collected from Unspecified source (platforms) — 9 November 2026
Facts collected from Official plan pages (pricing, licence, terms) (commercial use) — 7 November 2026
Facts collected from Comptoir du Libre (source code) — 6 November 2026
Facts collected from Automatic reading of the official pages (free status) — 6 November 2026
Facts collected from Homebrew (platforms) — 5 November 2026
Facts collected from Wikidata (licence, platforms) — 5 November 2026
Last technical check: 5 November 2026
Description from Flathub — AppStream (Flathub)

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