Signal is a privacy‑focused, open‑source messaging app developed by the Signal Foundation that provides end‑to‑end encrypted text messaging, voice and video calling, and media sharing. Designed for users who prioritize security and minimal data collection, Signal emphasizes strong cryptography, simple UI, and features that reduce metadata exposure while enabling private one‑to‑one and group communication across mobile and desktop platforms.
Signal now lets you create end‑to‑end encrypted backups of your messages and media so you can safely preserve and restore chat history when moving devices. Backups are encrypted locally with a passphrase (or recovery key) that only you know—Signal cannot read or recover your backup if the passphrase is lost—then you can store the encrypted file with your preferred cloud provider or keep it locally. To use it, open Settings → Chats → Backups (or follow the in‑app prompts), create a strong passphrase and follow the export/restore steps; when restoring on a new device, provide the same passphrase or recovery key to decrypt. This feature is optional, preserves Signal’s privacy guarantees, and is designed to make device migration easier while keeping your data protected.
1. Industry‑leading privacy and security with end‑to‑end encryption by default and a transparent, open‑source codebase.
2. Lightweight, distraction‑free interface focused on secure core messaging and calling features without ad tracking.
3. Cross‑platform support with desktop apps and improving multi‑device syncing while retaining privacy safeguards.
1. Requires a phone number for registration, which some privacy‑minded users view as a downside compared with username‑based services.
2. Smaller user base than mainstream platforms, so reaching contacts who use Signal may be more limited in some regions.
3. Some advanced convenience features (cloud‑style seamless backups and broad device sync) are intentionally limited to reduce metadata exposure, which can be less convenient for power users.
Yes—all messages, media and calls on Signal are protected end‑to‑end using the Signal Protocol. Only participants to a conversation can decrypt message contents; Signal’s servers cannot read message bodies.
Currently, Signal requires a phone number for account registration. Some users mitigate privacy concerns by using a secondary number or VoIP number, but requirements and availability vary by region and provider.
Signal provides platform‑specific options: Android supports encrypted local backups and device‑linking to transfer history; multi‑device linking can also help migrate access to desktops and tablets. On iOS, transfers are handled via device‑level backups and device‑to‑device migration flows—check Signal’s official support documentation for step‑by‑step, platform‑specific instructions and the latest guidance.
