How to Set Up Signal Desktop for Secure Messaging

Install Signal on Your Phone First

Signal Desktop requires an active Signal account on a mobile device before you can set up the desktop application. Download Signal from the Apple App Store or Google Play Store and register with your phone number. Complete the verification process by entering the SMS code Signal sends to your number. Create a Signal PIN that protects your account recovery information. This PIN is separate from your phone's lock screen and ensures you can recover your profile, settings, and contacts if you switch devices later.

Download Signal Desktop

Visit signal.org/download and select the installer for your operating system. Signal Desktop is available for Windows, macOS, and Linux distributions including Debian-based systems via APT and other distributions via Flatpak. On macOS, drag Signal to your Applications folder after downloading the DMG file. On Windows, run the installer executable which handles the installation automatically. On Linux, follow the specific installation instructions for your distribution, which typically involve adding Signal's repository to your package manager for automatic updates.

Link Desktop to Your Phone

Open Signal Desktop after installation and you will see a QR code displayed on your screen. On your phone, open Signal and go to Settings by tapping your profile icon. Select Linked Devices, then tap the plus button or Link New Device option. Your phone's camera will activate so you can scan the QR code displayed on your desktop screen. Point your phone's camera at the monitor and Signal will automatically detect the QR code. Approve the linking request on your phone when prompted to complete the connection between your devices.

Configure Desktop Notifications

After linking, customize your notification settings by clicking File then Preferences on Windows or Linux, or Signal then Preferences on macOS. Choose whether notifications should show the sender name and message preview, only the sender name, or just a generic notification without any identifying details. For maximum privacy in shared workspaces, select the option that shows neither name nor message content. You can also configure notification sounds, set quiet hours during which notifications are suppressed, and choose whether to show the message count on the application badge icon.

Sync and Manage Conversations

Signal Desktop syncs new messages in real time but does not automatically import your full message history from your phone for security reasons. Messages sent and received after linking will appear on both devices simultaneously. You can configure disappearing messages on a per-conversation basis by clicking the conversation header and selecting a timer duration ranging from thirty seconds to four weeks. Set a default disappearing message timer under Settings for all new conversations to ensure that even forgotten chats do not accumulate permanent message logs on your desktop.

Secure Your Desktop Installation

Enable screen lock in Signal Desktop preferences to require your system password or biometric authentication when the app has been idle. This prevents anyone with physical access to your computer from reading your messages when you step away. Keep Signal Desktop updated by enabling automatic updates, as security patches are released frequently. If you use a shared computer, consider enabling the registration lock feature on your phone to prevent someone from re-registering your phone number on another device and gaining access to your account.