Privacy Policy

Threema GmbH (hereafter “Threema”) was founded on the premise of uncompromising data protection. It is our primary goal to store only the absolute minimum of information for the shortest possible time (“Privacy by Design”). In addition to using state-of-the-art encryption methods, we take all necessary technical and organizational measures to prevent unauthorized data access and misuse.

1. General Information

The Threema Work app is made available to usersby their employer or organization (hereinafter referred to as "Organization"). The Organization or its authorized administrator have the possibility to determine or limit the use of the Threema Work app and thus the extent of the processed data individually. In this document, optionally processed data is marked with an asterisk (*).

As a Swiss company, Threema is subject to the laws and decrees of Switzerland. The processing and protection of user data is carried out in accordance with EU Regulation 2016/679 (GDPR). Details about the surrounding legal conditions can be found in the transparency report.

The Threema Work app can be used without providing any personal data. If users voluntarily provide their phone number or email address, they confirm in accordance with art. 8 GDPR that they are at least 16 years old or have obtained the consent of their legal guardian. By using the app, users agree to the collection, processing and use of data as described below.

2. Purpose of Data Processing

Threema processes data on behalf of the user’s Organization and to the extent determined by the Organization to enable the transmission of short messages and media to other users. The data processed within the scope of order fulfillment will be processed exclusively by Threema on its own server infrastructure in Switzerland and will not be passed on to third parties.

3. Scope and Duration of Data Processing

A. Inventory Data

Depending on the Organization's configuration, the following inventory data is collected and stored when using the Threema Work app:

The following information is optional and can be provided by the user or the Organization voluntarily in order to make it easier to be found by other Threema Work users:

When exchanging messages, only the following information will be passed on to other users or shared with the Organization upon signing in:

The information will not be passed on to third parties.

All information will only be stored by Threema until it is deleted by the user or by the Organization's administrator or until the Organization's account is closed at Threema. Once the information is deleted, it cannot be restored.

B. Message Contents

The Threema Work app encrypts all messages exchanged by users using a secure end-to-end encryption method.

Header information of messages (sender, recipient etc.) is protected by an additional encryption layer for transmission to the server, and from the server to the recipient, to prevent eavesdropping by third parties (e.g. in open wireless LANs).

Neither Threema as the operator of the Threema servers nor the users’ Organizations have the ability to decrypt messages, as they have no knowledge of the private keys 1).

All encrypted messages that users exchange are completely deleted on the servers as soon as they have been successfully delivered. The same goes for encrypted media (images, videos, files etc.) in direct chats between two users. Encrypted media in group chats, as well as any messages and media that have not, or only incompletely, been fetched, will in any case be deleted from the server automatically and irretrievably after two weeks.

Messages that users send to Threema (e.g. to the “*SUPPORT” ID, or to Threema Broadcast or specific Threema Gateway IDs) will only be stored as long as is necessary for providing the respective service, and are then irretrievably deleted. When communicating with other providers that are based on Threema Gateway or Threema Broadcast and whose IDs begin with an asterisk (*), the privacy policies of the respective providers apply.

1) * In order to ensure compliance with applicable regulations, the Organization has the option of setting up a pre-calculated key pair instead of having it created by the user at initial setup. In this case, messages may also be decrypted by the Organization. Should this option be used, the Organisation is obliged to comply with the relevant statutory provisions and to inform the user of this fact.

C. Address Book Data

At the explicit request of the user and if not deactivated by the Organization, email addresses and phone numbers from the address book can be synchronized. This data is transmitted to the servers in one-way encrypted ("hashed") form and additionally protected using TLS. The servers only keep these hashes in volatile memory for a short time to determine the list of matching IDs, and then delete the hashes immediately. At no point are the hashes or the results of the synchronization written to a data carrier.

D. Location Data

The “send location” feature transmits the coordinates of the user’s current location to the Threema server if and only if the user has allowed location sharing on their mobile device and the permission to access the user’s location has been granted. The coordinates are used to display a map section including a list of POIs (Places of Interest). The coordinates are transmitted in encrypted and anonymized form, without any reference to a Threema ID or any personally identifying information.

Generally, to use the “show map” feature, location sharing is not required. If location sharing is enabled, the permission to access the user’s location has been granted and the “your location” feature is used, the coordinates of the user’s current location are transmitted to the Threema server in order to center the map at the user’s current location. Both transmission and processing of the coordinates are performed in encrypted and anonymized form, without any reference to a Threema ID or any personally identifying information.

If the features “send location” and “show map” are not used, or the permission to access the user’s location has not been granted, no coordinates will be transmitted.

E. Crash Reports

In order to improve the stability and reliability of the app, Threema relies on anonymous crash reports.

iOS: If the user voluntarily and explicitly agrees to the transmission of a crash report after a crash of the app, information about the crash (status of the app at the time of the crash) is transferred to a server of Threema and stored there for evaluation. If the user does not agree to the crash report transmission, nothing will be sent. Crash reports do not contain any personal data. On iOS, they consist of a stack trace, some information about the device (model, operating system version, but no serial number or similar), the app version, the time stamp of the start and crash, and the list of software libraries loaded in memory. Processor register contents or log messages are not being collected.

4. Data Processed by Third Parties

Threema does not pass on any data to third parties, is completely free of advertising and does not use analytics software to monitor user behavior. However, some functionalities can only be provided by using external data sources, frameworks or operating system services, which in turn process data and are subject to a separate privacy policy.

A. Crash Reports

In order to improve the stability and reliability of the app, Threema Work relies on anonymous crash reports.

Android: If the user voluntarily and explicitly consents to the general transmission of crash reports to Google when setting up his mobile phone, information (status of the app at the time of the crash, stack trace, manufacturer and operating system of the mobile phone, latest log messages) will be transmitted to Google and stored there for evaluation by Threema. This information does not contain any personal data.

5. Right to Information, Correction, Blocking, Deletion and Objection

Users have the right to receive information about their personal data stored by Threema at any time. Likewise, users have the right to correct, block or (apart from the legally required data storage for business purposes) delete their personal data.

The stored inventory data can be viewed at any time within the Threema Work app in the "My ID" tab. If this function has not been deactivated by the Organization, the inventory data can be corrected or deleted with immediate effect.

In case of loss of the end-user device, mobile phone numbers and email addresses linked to a Threema ID can be deleted via the following link:

The Organization's administrator is able to irrecoverably delete all personal data and revoke the key pair at any time. Revocation can also be requested directly by the end user via the following link:

6. Responsible Body

In case of any questions about the extent of data processed, users shall first contact the responsible administrator or the data protection officer of their organization.

In case of any questions about data protection at Threema, users can contact Threema via email.

Responsible body and direct contact for data protection topics at Threema:

Threema GmbH
Data Protection Officer
Churerstrasse 82
8808 Pfäffikon SZ


Representative in the EU according to Art. 27 para. 1 GDPR: ACC Datenschutz UG, Messestraße 6, 94036 Passau, Germany

7. Amendment of the Privacy Policy

Threema reserves the right to change this Privacy Policy from time to time in order to comply with changed legal requirements or to reflect new functionalities of the app. The current Privacy Policy is always available for consultation from within the Threema Work app.


This is a mere translation of the German version of this document.

In case of any discrepancies between the English version and the German version of this document, the German version will prevail.