Signal is a free, open-source messaging app that encrypts every message and call end to end, so only you and your recipients can read or hear them. It runs on phones and desktops under a nonprofit that sells no ads and collects no tracking data.
Signal is a messaging application that wraps everyday conversation in end-to-end encryption by default: text, voice notes, photos, videos, files, GIFs, and group chats all travel through the open-source Signal Protocol, so the service itself cannot read or listen to them. You install it on your phone, register with a phone number or username, and message anyone already in your contacts who uses the app. Voice and video calls, including group calls, work over the same encrypted channel. Disappearing messages, edit and delete controls, and desktop linking extend the workflow across devices. The value is straightforward: you keep the familiar rhythm of modern chat while removing advertising, tracking, and server-side retention from the equation entirely.
Signal is operated by the Signal Foundation, a nonprofit funded by donations rather than advertising, so there is no business model built on profiling its users. The client code is open source and has been independently reviewed, and the protocol is published so researchers can scrutinize it. Recent releases go further on identity: you can hide your phone number behind a username, control who can find you, and lock registration to a device. Group features, pinned chats, and custom sticker packs make it workable for community coordination, not just one-to-one chats. If you also keep plain text notes on your desktop, tools like Notepad3 are a good complement to the app for drafting longer content offline.
Using Signal means your conversations stop being a data source. Because encryption is mandatory rather than a toggle, there is no setting to forget and no plaintext copy waiting on a server, which removes an entire class of risk from routine communication — a misconfigured account, a breached backup, or a subpoena for message logs the service never had. Calls sound clear over ordinary data connections, so international conversations cost nothing extra, and media sharing keeps full quality without ad interruptions. The desktop client and linked devices let you keep a long thread going from a laptop, while registration lock and username-based contact reduce how much personal information you hand out. Groups of any practical size stay manageable with admin controls and invite links. For anyone who values privacy but does not want a clunky tool, Signal is the rare case where the secure option is also the more pleasant one.
Every text message, voice note, photo, video, file, and call is encrypted with the Signal Protocol before it leaves your device, and the setting cannot be turned off. Recipients' devices decrypt the content, so the service and any network in between only ever handle scrambled data. This removes the usual step of enabling a private mode and makes secure conversation the default behavior rather than an option a user must remember to switch on.
One-to-one and group voice and video calls run over the same encrypted channel as your chats, with no separate account or per-minute charge. Because calls travel over your data connection, distance does not change the cost, which makes long-distance family calls and remote team standups practical. Participants can join group calls from a link, and screen sharing is available when you need to walk someone through something visually.
You can set messages to vanish after a chosen interval, from a short timer to a longer window, either per conversation or as a default for every new chat. Editing, deleting for everyone, and pinning give you the same practical control you expect from mainstream messengers. These controls are useful for sharing a code, an address, or a one-time detail without leaving it in a thread indefinitely.
Instead of exposing your phone number to everyone you message, Signal lets you create a username and choose who can discover you. Contact sharing can be restricted so people who already have your number cannot automatically see that you use the app. This matters for anyone who communicates in public groups, sells services, or simply does not want a phone number circulating as their identity.
Link the mobile app to a desktop client and your conversations stay synchronized, so you can type longer replies on a real keyboard without switching tools. Media, reactions, and read state carry across devices. The desktop build is a full participant in the encrypted conversation rather than a mirror, which keeps the same protections in place wherever you happen to be working.
Group conversations support admin permissions, invite links, mentions, and per-group settings for disappearing messages. Members can react, reply in threads within the chat, and share files without leaving the app. For clubs, volunteer teams, and extended families, this keeps a single encrypted space for coordination instead of scattering plans across multiple services that each handle data differently.
The client applications and the Signal Protocol are open source, so security researchers can inspect exactly how messages are protected and report flaws publicly. Independent audits of the protocol have been published, and the codebase has changed over years of scrutiny. That transparency is the reason the encryption is trusted by journalists, activists, and security professionals who cannot rely on a vendor's word.
Signal carries no advertising, no third-party analytics, and no affiliate tracking, and it is run by a nonprofit that cannot be bought by an advertising company. Development is funded by donations and grants. Practically, that means the interface stays free of promoted content and your usage patterns are not assembled into a profile used to sell anything.
Yes. Every conversation is end-to-end encrypted automatically, which means the content is encrypted on your device and can only be decrypted by the recipient's device. Signal's servers relay encrypted data and retain almost nothing to hand over. This is not an optional setting you enable; it applies to messages, calls, and group chats from the first time you use the app.
No. Signal is free to use, with no subscription tier and no feature locked behind a payment. It is developed by a nonprofit organization funded by donations and grants rather than advertising or data sales, which is why there are no ads inside the app and no paid upgrade for encryption.
You can create a username that other people use to reach you, and you can adjust who is allowed to discover you by phone number or add you to groups. Verification during setup still involves a phone number, but you no longer need to share it as your visible identity in everyday conversations.
Yes. A desktop client is available, and you link it by scanning a code from your phone. Linked devices are full participants in encrypted conversations, so messages, media, and read state stay synchronized, and you can keep typing from a keyboard while your phone stays in your pocket.
Messages are stored on your devices, and the service keeps only the minimum needed to deliver them, such as a queue for recipients who are offline. Once delivered, there is no readable archive of your conversation on the server to request, because the content was never readable there in the first place.
Yes. You can delete a message for everyone in the chat and edit sent messages within a time limit, with the change reflected on recipients' devices. Combined with disappearing messages, which remove content automatically after a set interval, these controls let you correct mistakes and limit how long a detail remains in a thread.
Your message history lives on your devices rather than in a cloud archive, so a lost or replaced phone means you cannot recover old conversations. Registration lock, which requires a PIN to re-register your number, protects against someone else taking over your account. Setting up the app on a new device restores your account but not the previous message history.
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