Signal Call Encryption: Voice and Video Privacy

Does Signal encrypt video calls?

Yes. Signal applies end-to-end encryption to video calls as well as voice calls, so the real-time media is protected while it travels between participants. The central answer is that Signal call encryption covers both voice and video content, but the protection depends on the call being made through Signal between parties who are both using Signal. The encryption applies to the call itself, not to everything that surrounds it.

What the encryption protects

Signal's call encryption is designed to prevent intermediaries from reading or watching the call content. In an end-to-end design, the communication is encrypted on the sender's device and decrypted only on the recipient's device. This means that the audio stream of a voice call and the image and audio stream of a video call are not exposed in usable form to the network or to Signal's infrastructure in the same way that a provider without end-to-end encryption might handle them.

The same underlying protection applies to one-to-one and group calls. The central property is that participants hold the means to decrypt the call, which reduces the risk of interception during transport. However, encryption does not make the communication anonymous or remove all traces of it.

Important limits and qualifications

• Encryption protects the call in transit, not the devices at either end. If a device is compromised, has malicious software, or is being viewed by someone else, the call can still be exposed.
• A participant can record, screenshot, or use another device to capture the call. Signal's encryption does not prevent that.
• Calling a non-Signal number is not the same as a protected Signal call. The relevant protection applies to calls made within Signal.
• Metadata is a separate concern. Encryption may not hide that a call occurred, when it happened, how long it lasted, or which accounts were involved, depending on what Signal records and what the surrounding network can observe.
• Notifications, lock-screen previews, speakerphone use, and screen sharing can reveal call-related information to people or cameras near the device.

What this means for media privacy

For someone concerned with the privacy and security of voice or video as media, Signal's call encryption reduces the risk of interception by a third party during transport. It does not provide control over what the other participant does with the call, nor does it make the communication untraceable or the surrounding device secure.

The main privacy decision is therefore not only to use an encrypted calling feature, but also to call the right person through the right channel, keep the device protected, and assume that the person on the other end can retain or expose the call. Encryption is one layer in media privacy, not a complete guarantee.