Open Source Continuous File Synchronization; contains branches to build Syncthing as a C library
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Martchus 522c568552 Add basic C bindings to start and stop Syncthing 4 years ago
.github build: Upgrade to GitHub-native Dependabot (#7607) 6 months ago
assets assets, gui: Losslessly compress all JPG, PNG, and PDF images (#6265) 2 years ago
c-bindings Add basic C bindings to start and stop Syncthing 3 weeks ago
cmd all: Unused args, retvals, assignments (#7926) 2 months ago
etc etc: Fix start-limit parameters location in systemd units (ref #7439) (#7529) 7 months ago
gui Revert "gui: Allow to resize command in External Versioning (#7410)" (#7978) 4 weeks ago
lib lib/config: Always set mtime window to 2 on Android unless ext detected (ref #7963) (#7966) 4 weeks ago
man gui, man, authors: Update docs, translations, and contributors 1 month ago
meta lib: Use counterfeiter to mock interfaces in tests (#7375) 8 months ago
next-gen-gui gui: Semicolons (#7597) 6 months ago
proto gui, lib: Handle pw adding remote encrypted folder (fixes #7705) (#7772) 4 months ago
script all: Update build constraints to Go 1.17 style (#7894) 2 months ago
test all: Update build constraints to Go 1.17 style (#7894) 2 months ago
.codecov.yml build: Add test coverage info (#7502) 7 months ago
.deepsource.toml build: Fix deepsource test & exclude patterns (#7969) 1 month ago
.gitattributes lib/protocol: Revert protobuf encoder changes in v0.14.17 (fixes #3855) 5 years ago
.gitignore Ignore GoLand cruft 6 months ago
.golangci.yml golangci: Skip godox 2 years ago
AUTHORS gui, man, authors: Update docs, translations, and contributors 2 months ago conduct: Upgrade to Contributor Covenant 3 years ago contributing: Fix GitHub format (#7713) 5 months ago
Dockerfile docker: Expose 22000/udp (#7421) 8 months ago
Dockerfile.builder build: Simplify gem command in Debian Docker image 2 months ago
Dockerfile.buildx docker: Expose 22000/udp (#7421) 8 months ago
Dockerfile.stdiscosrv docker: Accept Go version as --build-arg 2 years ago
Dockerfile.strelaysrv docker: Accept Go version as --build-arg 2 years ago goals: Typo 4 years ago
LICENSE all: Update license url to https (ref #3976) 5 years ago docker: Remove sysctl from README (#7670) 6 months ago readme: Add a link to docs source (#7909) 2 months ago
build.go build: Update all dependencies (#7968) 1 month ago
build.ps1 build: Clean up, add build.ps1 (#6689) 1 year ago build: Clean up, add build.ps1 (#6689) 1 year ago
go.mod build: Update all dependencies (#7968) 1 month ago
go.sum build: Update all dependencies (#7968) 1 month ago
tools.go build: List go:generate tools in tools.go (#7599) 6 months ago


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Syncthing is a continuous file synchronization program. It synchronizes files between two or more computers. We strive to fulfill the goals below. The goals are listed in order of importance, the most important one being the first. This is the summary version of the goal list - for more commentary, see the full Goals document.

Syncthing should be:

  1. Safe From Data Loss

    Protecting the user's data is paramount. We take every reasonable precaution to avoid corrupting the user's files.

  2. Secure Against Attackers

    Again, protecting the user's data is paramount. Regardless of our other goals we must never allow the user's data to be susceptible to eavesdropping or modification by unauthorized parties.

  3. Easy to Use

    Syncthing should be approachable, understandable and inclusive.

  4. Automatic

    User interaction should be required only when absolutely necessary.

  5. Universally Available

    Syncthing should run on every common computer. We are mindful that the latest technology is not always available to any given individual.

  6. For Individuals

    Syncthing is primarily about empowering the individual user with safe, secure and easy to use file synchronization.

  7. Everything Else

    There are many things we care about that don't make it on to the list. It is fine to optimize for these values, as long as they are not in conflict with the stated goals above.

Getting Started

Take a look at the getting started guide.

There are a few examples for keeping Syncthing running in the background on your system in the etc directory. There are also several GUI implementations for Windows, Mac and Linux.


To run Syncthing in Docker, see the Docker README.

Vote on features/bugs

We'd like to encourage you to vote on issues that matter to you. This helps the team understand what are the biggest pain points for our users, and could potentially influence what is being worked on next.

Getting in Touch

The first and best point of contact is the Forum. If you've found something that is clearly a bug, feel free to report it in the GitHub issue tracker.


Building Syncthing from source is easy, and there's a guide that describes it for both Unix and Windows systems.

Signed Releases

As of v0.10.15 and onwards release binaries are GPG signed with the key D26E6ED000654A3E, available from and most key servers.

There is also a built in automatic upgrade mechanism (disabled in some distribution channels) which uses a compiled in ECDSA signature. macOS binaries are also properly code signed.


Please see the Syncthing documentation site [source].

All code is licensed under the MPLv2 License.