You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
Adaptive Garage 05abb3f9f6
Send remote delete (#593)
1 week ago
.github/workflows Update codeql-analysis.yml 5 months ago
.idea/codeStyles Reformat project 4 months ago
buildSrc Extract checkLibVersions task to gradle plugin 3 months ago
data Update systemd service file 3 months ago
graalvm-config-dir GraalVM: added reflection config (#507) 2 months ago
gradle/wrapper Update gradle wrapper 3 months ago
lib Send remote delete (#593) 1 week ago
man Send remote delete (#593) 1 week ago
src/main/java/org/asamk Send remote delete (#593) 1 week ago
.gitignore Added sticker field to json output. Also added hidden mac file to .gitignore (#418) 3 months ago Bump version 1 month ago Update README 2 weeks ago
FUNDING.yml Create FUNDING.yml 1 month ago
LICENSE Add README and LICENCE 6 years ago Update README 2 weeks ago
build.gradle.kts Bump version 1 month ago
gradlew Update gradle wrapper 7 months ago
gradlew.bat Update gradle wrapper 7 months ago
settings.gradle.kts Extract lib module 3 months ago


signal-cli is a commandline interface for libsignal-service-java. It supports registering, verifying, sending and receiving messages. To be able to link to an existing Signal-Android/signal-cli instance, signal-cli uses a patched libsignal-service-java, because libsignal-service-java does not yet support provisioning as a slave device. For registering you need a phone number where you can receive SMS or incoming calls. signal-cli is primarily intended to be used on servers to notify admins of important events. For this use-case, it has a dbus interface (man page), that can be used to send messages from any programming language that has dbus bindings.


You can build signal-cli yourself, or use the provided binary files, which should work on Linux, macOS and Windows. For Arch Linux there is also a package in AUR and there is a FreeBSD port available as well.

System requirements:

  • at least Java Runtime Environment (JRE) 11

  • native libraries: libzkgroup, libsignal-client

    Those are bundled for x86_64 Linux, for other systems/architectures see: Provide native lib for libsignal

Install system-wide on Linux

See latest version.

export VERSION=<latest version, format "x.y.z">
sudo tar xf signal-cli-"${VERSION}".tar.gz -C /opt
sudo ln -sf /opt/signal-cli-"${VERSION}"/bin/signal-cli /usr/local/bin/

You can find further instructions on the Wiki:


For a complete usage overview please read the man page and the wiki.

Important: The USERNAME is your phone number in international format and must include the country calling code. Hence it should start with a "+" sign. (See Wikipedia for a list of all country codes.)

  • Register a number (with SMS verification)

      signal-cli -u USERNAME register

    You can register Signal using a land line number. In this case you can skip SMS verification process and jump directly to the voice call verification by adding the --voice switch at the end of above register command.

  • Verify the number using the code received via SMS or voice, optionally add --pin PIN_CODE if you've added a pin code to your account

      signal-cli -u USERNAME verify CODE
  • Send a message

      signal-cli -u USERNAME send -m "This is a message" RECIPIENT
  • Pipe the message content from another process.

      uname -a | signal-cli -u USERNAME send RECIPIENT
  • Receive messages

      signal-cli -u USERNAME receive


The password and cryptographic keys are created when registering and stored in the current users home directory:

$XDG_DATA_HOME/signal-cli/data/ ($HOME/.local/share/signal-cli/data/)

For legacy users, the old config directories are used as a fallback:




This project uses Gradle for building and maintaining dependencies. If you have a recent gradle version installed, you can replace ./gradlew with gradle in the following steps.

  1. Checkout the source somewhere on your filesystem with

     git clone
  2. Execute Gradle:

     ./gradlew build
  3. Create shell wrapper in build/install/signal-cli/bin:

     ./gradlew installDist
  4. Create tar file in build/distributions:

     ./gradlew distTar

Building a native binary with GraalVM (EXPERIMENTAL)

It is possible to build a native binary with GraalVM. This is still experimental and will not work in all situations.

  1. Install GraalVM and setup the enviroment

  2. Install prerequisites

  3. Execute Gradle:

     ./gradlew assembleNativeImage

    The binary is available at build/native-image/signal-cli


If you use a version of the Oracle JRE and get an InvalidKeyException you need to enable unlimited strength crypto. See for instructions.


This project uses libsignal-service-java from Open Whisper Systems:

Licensed under the GPLv3: