Threema - Secure messaging & privacy

Threema stands out as the leading secure messaging application globally, ensuring that your data remains protected from hackers, corporations, and governmental entities. The platform allows for complete anonymity in its usage. As an open-source application, Threema encompasses all the functionalities one would anticipate from a contemporary instant messaging service. Additionally, it facilitates end-to-end encrypted voice, video, and group calls. You can also access Threema via its desktop application and web client, making it usable from your computer.

PRIVACY AND ANONYMITY

Designed with privacy in mind, Threema minimizes data generation on servers. Group memberships and contact details are stored solely on your device and are never saved on our servers. Messages are instantly deleted after delivery, while local files remain encrypted on your mobile device or tablet. These measures effectively mitigate the risk of collecting and misusing personal data, including metadata. Threema adheres fully to European privacy regulations.

ROCK-SOLID ENCRYPTION

All communications on Threema, such as messages, calls, group chats, files, and even status updates, are secured through end-to-end encryption. Only the designated receiver has the ability to read your messages. For encryption purposes, Threema employs the reputable open-source NaCl cryptography library. Encryption keys are generated and stored securely on users' devices, preventing any potential backdoor access or unauthorized copies.

COMPREHENSIVE FEATURES

Threema operates not just as an encrypted and private messenger but also as a versatile platform packed with features.

• Send text messages and voice notes

• Edit and retract messages from the recipient's view

• Engage in voice, video, and group conversations

• Share videos, images, and locations

• Send various file types (pdf, animated gif, mp3, doc, zip, etc.)

• Utilize the desktop application or web client for chatting

• Establish groups

• Conduct surveys using the poll functionality

• Choose between light and dark themes

• Express reactions to messages using emojis

• Authenticate contacts by scanning their unique QR code

• Use Threema for anonymous messaging

• Optionally synchronize your contacts

SERVER LOCATION

All servers are situated in Switzerland, with all software development conducted in-house.

FULL ANONYMITY

Every user of Threema is assigned a random Threema ID for identification, eliminating the need for a phone number or email address. This feature enables the use of Threema without revealing personal information or creating an account.

OPEN SOURCE AND AUDITS

The app’s source code is accessible for public review. In addition, esteemed experts are regularly engaged to perform thorough security audits of Threema's code.

NO ADS, NO TRACKERS

Threema operates without advertising revenue and does not gather user data.

What does the name "Threema” stand for?

Threema started as an abbreviation:“EEEMA," for “End-to-End Encrypted Messaging Application" The three “E"s were a bit unwieldy, so it became “"Threema."

What makesThreema special?

Threema is the world's best-seling secure messenger. It sets itself apart from others in the following respects:

·Privacy as a guiding principle: Threema is designed to generate as little data on servers as technically possible

·Full anonymity: You are not forced to provide any personal information (such as your phone number or email address) in order to use Threema.

·Open source: To provide full transparency, the Threema apps are open source. Anyone knowledgeable enough can confirm Threema's security on their own.

·Optional contact synchronization: It's not necessary to grant access to the address book in order to use Threema.

Comprehensive encryption: In Threema, all your communication is end-to-end encrypted - not just text messages and voice and video calls but also group chats, media files, and even status messages.

·Rich functionality: Threema is versatile and feature-rich.

Find out how Threema stacks up against other messengers like WhatsApp, Signal, or Telegram in the comprehensive messenger comparison and the in-depth comparison of Threema and WhatsApp.

With Threema Work and Threema Gateway, Threema also provides solutions for secure communication in business contexts.