Signal Desktop

Signal Desktop is the Windows companion client for Signal Private Messenger, the encrypted messaging service operated by the non-profit Signal Foundation. The desktop app links to the phone number you already registered on mobile and mirrors your conversations, so you can type on a real keyboard instead of thumbing a touchscreen. Signal Desktop is not a standalone account system: installation produces a device that is paired to your phone, and the phone remains the anchor for registration.

What it does

The client carries the full Signal feature set into a desktop window. You get one-to-one and group text chats, voice messages, photo and file attachments, stickers, reactions, replies, message editing and deletion, plus voice and video calls with screen sharing. Message history is retained locally in an encrypted database, and the app can optionally synchronise recent history from the phone when a device is linked. Disappearing messages can be configured per conversation with timers ranging from seconds to weeks, and the whole database is protected at rest with a passphrase you choose.

The workflow

Install the program, then link it to your phone by scanning the QR code shown at first launch from the mobile app's linked devices screen. Signal renders a QR code and the phone scans it; that pairing step is the only heavy piece of setup. After that the desktop app behaves like a conventional chat client: a conversation list on the left, the active thread in the middle, and a search field that covers both contacts and the text of your local message store. Notifications respect the Windows focus-assist settings, and you can mute individual conversations, set a custom notification sound, or pin chats to the top of the sidebar for quick access. Settings also expose a proxy configuration for networks that block the service, and an option to send typing indicators or read receipts, both of which can be disabled.

Practical settings and limits

Two constraints matter in daily use. First, Signal Desktop depends on the phone: if the phone is offline for an extended period the linked device eventually loses its session and must be re-linked. Second, you cannot register a fresh account from the desktop app itself, so someone with no smartphone cannot use it. On the storage side, attachments and history accumulate in the local profile folder, and the app offers a clear-data control but no export to a readable archive. Very old message history from the phone is not always fully transferred, and large media libraries can consume a surprising amount of disk space.

Who should choose something else

Pick a different client if you need a desktop-first service that works without a phone number, if you require server-side search across years of corporate mail and chat, or if your organisation mandates centralised compliance archiving and administration consoles. Businesses that need federation across many independent servers, or that must self-host the relay infrastructure, are better served by Matrix-based clients. Users who mainly want a light-weight, protocol-agnostic client for several legacy networks should look at a multi-protocol messenger instead.