Download Threema Messenger Download – 6.4.1

The service can be used completely anonymously. Threema is open source, enables end-to-end encrypted voice and video calls, and offers all the features you’d expect from a state-of-the-art instant messenger. With Threema Web you can also use Threema from your desktop.

Privacy and anonymity

Threema is designed from the ground up to generate as little data on servers as possible. Group memberships and contact lists are managed only on your device and are never stored on our servers. Messages are deleted immediately after they are delivered. Local files are stored encrypted on your mobile phone or tablet. All this effectively prevents the collection and misuse of your personal information, including metadata. Threema is fully compliant with the European Data Protection Legislation (GDPR).

Highest encryption strength

Threema end-to-end encrypts all communications, including messages, voice and video calls, group chats, files and even status messages. Only the intended recipient, and no one else, can read your messages. Threema uses the trusted open source NaCl cryptography library for encryption. The encryption keys are generated and stored securely on users’ devices to prevent backdoor access or copies.

Functions

Threema is not only an encrypted and private messenger, but also versatile and feature-rich.

• Write text and send voice messages
• Make voice and video calls
• Share video images and locations
• Send any type of file (pdf animated gif, mp3, doc, zip, etc.)
• Use Threema Web to chat from your desktop
• Create groups
• Conduct polls with the polling feature
• Choose between a dark and a light theme
• Respond quickly and quietly with the unique agree/disagree function
• Verify the identity of a contact by scanning their personal QR code
• Use Threema as an anonymous instant messaging tool
• Sync your contacts (optional)

Servers in Switzerland

All our servers are located in Switzerland and we develop our software in-house.

Full anonymity

Each Threema user receives a random Threema ID for identification. A phone number or email address is not required to use Threema. This unique feature allows you to use Threema completely anonymously – you don’t need to give out any private information or open an account.

Open source code and revisions

The source code of the Threema app is open for all to see. In addition, recognized experts are regularly commissioned to carry out systematic security audits of Threema’s code.

No ads, no trackers

Threema is not funded by advertising and does not collect user data.

What’s new

• Threema 2.0 for desktop: Now you can connect two computers to your mobile device
• Fixed a bug that prevented some videos recorded with an iPhone 16 from being sent
• Various improvements and bug fixes