Signal is an open-source, encrypted messaging app designed for instant messaging, voice calls, and video calls with a strong focus on privacy and security. It allows users to send texts, voice notes, images, videos, files, and make group calls with up to 40 participants. All communication on Signal is protected with end-to-end encryption, meaning only the sender and recipient can read messages or listen to calls, not even Signal itself. The app is cross-platform and available on iOS, Android, and desktop (Windows, macOS, Linux), requiring a phone number for registration but now also allowing usernames to hide phone numbers for privacy. Signal does not collect user data or display ads; it is operated by the non-profit Signal Foundation, supported by donations, not advertisers. Key features include:
- Encrypted one-to-one and group messaging and calls
- Message timers for automatic deletion
- Face blurring for photos for privacy
- Encrypted stickers and customizable app appearance
- No data storage on servers beyond temporary delivery needs
- Cryptocurrency wallet feature for in-app payments in some regions
Signal is often praised for protecting user privacy better than many other messaging apps and is used by journalists, activists, and privacy-conscious users worldwide. Its architecture emphasizes security, with mechanisms to verify contacts' identities and encrypted data channels.
In summary, Signal is a secure, private messaging app with robust end-to-end encryption, designed to keep users' conversations confidential and free from surveillance or data collection.
