Download Signal for Android, iOS, Linux, macOS, and Windows.

Download Signal app for Android, iOS, iPhone, iPad, iPod Touch, or Desktop for free! Get the latest version of Signal Messenger.

Signal is now developed by Signal Messenger LLC, a software company founded by Moxie Marlinspike and Brian Acton in 2018, which is wholly owned by a tax-exempt nonprofit corporation called the …

Signal is a messaging app with privacy at its core. It is free and easy to use, with strong end-to-end encryption that keeps your communication completely private.

Dec 2, 2025 · Instead of accepting life in a fishbowl, use Signal to keep your communication private and secure. The free, open-source app protects your calls, messages, and video chats from prying eyes …

Jan 12, 2026 · Signal is a messaging app with privacy at its core. It is free and easy to use, with strong end-to-end encryption that keeps your communication completely private.

Jun 20, 2025 · Learn what the Signal app is used for, how secure it is, who owns the private app, and best practices for safe messaging.

State-of-the-art end-to-end encryption (powered by the open source Signal Protocol) keeps your conversations secure. We can't read your messages or listen to your calls, and no one else can either.

The Signal Protocol (formerly known as the TextSecure Protocol) is a non- federated cryptographic protocol that provides end-to-end encryption for voice and instant messaging conversations. [2] The …

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