To use the Signal desktop app, Signal must first be installed on your phone.

NOTE: These instructions only work for 64-bit Debian-based
Linux distributions such as Ubuntu, Mint etc.

1. Install our official public software signing key:
   wget -O- https://updates.signal.org/desktop/apt/keys.asc | gpg --dearmor > signal-desktop-keyring.gpg;
   cat signal-desktop-keyring.gpg | sudo tee /usr/share/keyrings/signal-desktop-keyring.gpg > /dev/null

2. Add our repository to your list of repositories:
   wget -O signal-desktop.sources https://updates.signal.org/static/desktop/apt/signal-desktop.sources;
   cat signal-desktop.sources | sudo tee /etc/apt/sources.list.d/signal-desktop.sources > /dev/null

3. Update your package database and install Signal:
   sudo apt update && sudo apt install signal-desktop

sigtop is a utility to export messages, attachments and other data from Signal Desktop.
For example, the following two commands export all messages to the messages directory and all attachments to the attachments directory:

sigtop export-messages messages
sigtop export-attachments attachments

First install Go (version 1.18 or later) and a C compiler. On systems other than OpenBSD, you also need to install libsecret and pkg-config.

On Ubuntu 22.04 or later, you can run the following command to install the required packages:

sudo apt install gcc golang libsecret-1-dev pkg-config

Then, to install sigtop, run:

go install github.com/tbvdm/sigtop@master

This command installs a sigtop binary in ~/go/bin. You can choose another installation directory by setting the GOBIN environment variable. For example, to install sigtop in ~/bin, run:

GOBIN=~/bin go install github.com/tbvdm/sigtop@master

If you prefer, you can install sigtop without libsecret support by specifying the no_libsecret build tag:

go install -tags no_libsecret github.com/tbvdm/sigtop@master

All of Signal's file sharing size limits in every version of the app
Signal allows you to share videos up to 100 MB, GIFs up to 25 MB, and images up to about 8 MB. The maximum size can vary depending on the device and version of the app you are using.

Signal Review 2025: Secure Messenger (Pros and Cons) - This Signal Messenger review was last updated January 15, 2025.
https://cyberinsider.com/secure-encrypted-messaging-apps/signal/

This little-known trick lets you use Signal without giving out your phone number
https://techlearningcollective.com/2019/10/29/this-little-known-trick-lets-you-use-signal-without-giving-out-your-phone-number.html

Signal : tout comprendre à l’application de messagerie sécurisée à très fort succès
https://www.lemonde.fr/pixels/article/2021/01/11/signal-tout-comprendre-a-l-application-de-messagerie-securisee-a-tres-fort-succes_6065914_4408996.html?lmd_medium=al&lmd_campaign=envoye-par-appli&lmd_creation=ios&lmd_source=default

Signal Review
https://proprivacy.com/privacy-service/review/signal

Hide Your Number on Signal and Use a Username for More Privacy
https://www.makeuseof.com/hide-your-number-on-signal-use-username/

Hide Your Number on Signal and Use a Username for More Privacy
https://www.makeuseof.com/hide-your-number-on-signal-use-username/

NOTE: These instructions only work for 64-bit Debian-based
Linux distributions such as Ubuntu, Mint etc.

1. Install our official public software signing key:
   wget -O- https://updates.signal.org/desktop/apt/keys.asc | gpg --dearmor > signal-desktop-keyring.gpg
   cat signal-desktop-keyring.gpg | sudo tee /usr/share/keyrings/signal-desktop-keyring.gpg > /dev/null

2. Add our repository to your list of repositories:
   echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/signal-desktop-keyring.gpg] https://updates.signal.org/desktop/apt xenial main' |\
   sudo tee /etc/apt/sources.list.d/signal-xenial.list

3. Update your package database and install Signal:
   sudo apt update && sudo apt install signal-desktop

Creating a username on Signal lets you connect with others without giving out your phone number.

Le fondateur de Signal vient de saboter, avec style, l'un des joujous high-tech favoris de la police. On essaie de vous expliquer simplement. Signal, la messagerie chiffrée qu'on ne présente plus