Threema. The Secure Messenger

Threema is the world's leading secure messenger, safeguarding your data from unauthorized access by hackers, corporations, and governments. The service offers complete anonymity. As an open-source platform, Threema provides all the features expected from a cutting-edge instant messenger, including end-to-end encrypted voice, video, and group calls. You can also access Threema from your desktop using the desktop app and web client.

PRIVACY AND ANONYMITY
Threema is engineered to minimize data storage on servers. Group memberships and contact lists are device-exclusive and never stored on our servers. Messages are deleted immediately after delivery. Local files are stored encrypted on your mobile device. This approach prevents the collection and misuse of your personal information, including metadata. Threema is fully compliant with European privacy regulations (GDPR).

ROCK-SOLID ENCRYPTION
Threema employs end-to-end encryption for all communication, including messages, voice and video calls, group chats, files, and status messages. Only the intended recipient can read your messages. Threema utilizes the trusted open-source NaCl cryptography library for encryption. Encryption keys are generated and securely stored on users' devices to prevent unauthorized access.

COMPREHENSIVE FEATURES
Threema is a versatile and feature-rich encrypted messenger.

• Send text and voice messages
• Make voice, video, and group calls
• Share videos, pictures, and locations
• Send various file types (pdf, animated gif, mp3, doc, zip, etc.)
• Use the desktop app or web client to chat from your computer
• Create groups
• Conduct polls
• Choose between dark and light themes
• Quickly reply with the unique agree/disagree feature
• Verify contact identities by scanning their QR code
• Use Threema as an anonymous instant messaging tool
• Synchronize contacts (optional)

SERVERS IN SWITZERLAND
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. This feature allows for complete anonymity – no need to provide private information or create an account.

OPEN SOURCE AND AUDITS
Threema's source code is open for review. Renowned experts regularly conduct security audits of Threema's code.

NO ADS, NO TRACKERS
Threema is not financed by advertising and does not collect user data.

SUPPORT / CONTACT
For questions or