Threema is the world’s best-selling secure messenger, used by more than 12 million people in over 175 countries, developed in Switzerland, and designed with privacy and data protection in mind

Whether chats, calls, or files, everything is end-to-end encrypted, and no data trail is left behind

Instead of a phone number or email address, a randomly generated Threema ID serves as a unique identifier – anonymous and secure

Threema protects what really matters: your privacy.

Advantages of Threema:

Text and voice messages, including emoji reactions

End-to-end encrypted voice, video, and group calls

Location sharing

Sending files in all formats (PDF, GIF, MP3, ZIP, and more)

Ability to edit sent messages and delete them for chat partners

Desktop app and web client for convenient chatting on your PC

Group creation and polls

Light or dark mode

No ads, no trackers, no data collection

Identity verification of contacts by scanning their QR code

Reliable security:

Open source and regular audits

Servers in Switzerland

Anonymous use possible: no phone number or email address required

Messages are deleted from the server immediately after delivery

Do you have any questions or problems? Our FAQ can help: https://threema.com/support

Enjoy using Threema!