Threema. The Secure Messenger

Are you looking for a secure messaging app that prioritizes your privacy and data security? Look no further than Threema. The Secure Messenger. Threema is the world's best-selling secure messenger that keeps your data out of the hands of hackers, corporations, and governments. With Threema, you can communicate with confidence knowing that your messages are fully encrypted and your privacy is protected.

Privacy and Anonymity

Threema is designed to generate as little data on servers as possible, ensuring that your information remains private. Group memberships and contact lists are managed on your device only and never stored on servers. Messages are immediately deleted after delivery, and local files are encrypted on your device. Threema is fully compliant with European privacy legislation (GDPR), giving you peace of mind about the security of your data.

Rock-Solid Encryption

All communications on Threema are end-to-end encrypted, including messages, voice and video calls, group chats, and more. The encryption keys are generated and securely stored on users' devices, preventing unauthorized access to your data. Threema uses the trusted NaCl cryptography library for encryption, ensuring the integrity of your communications.

Comprehensive Features

• Write text and send voice messages


• Edit and delete sent messages on the recipient's end


• Make voice, video, and group calls


• Share videos, pictures, and locations


• Send any type of file (pdf, animated gif, mp3, doc, zip, etc.)


• Use the desktop app or web client to chat from your computer


• Create groups and conduct polls


• Choose between dark and light themes


• React to messages with emojis


• Verify contact identities with QR codes


• Use Threema as an anonymous instant messaging tool


• Synchronize contacts (optional)

Servers in Switzerland

All Threema servers are located in Switzerland, and the software is developed in-house, ensuring data security and reliability.

Full Anonymity

Threema users receive random IDs for identification, eliminating the need for phone numbers or email addresses. This unique feature allows for complete anonymity while using the app.

Open Source and Audits

The source code of Threema is open for public review, and regular security audits are conducted by experts to ensure the integrity of the app.

No Ads, No Trackers

Threema is ad-free and does not collect user data, prioritizing your privacy and user experience.

Support / Contact

For any questions or issues, refer to our FAQs: Threema FAQs