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Self Hosting

Some users might want to host their own Threema Web instance. Here is a quick overview on how to achieve that.

The following components can be self-hosted:

  • Threema Web
  • SaltyRTC Server
  • STUN / TURN Server

The push relay server could in theory be self-hosted too, but it won't help as the GCM / APNs API keys required to dispatch push notifications are not public.

If you have questions, please open an issue on Github.

Threema Web

Threema Web is a web application written in TypeScript with AngularJS 1. All that is required to host it is a web server that can deliver static content via https. We recommend using Nginx. Additionally, to build the release version yourself, a recent version of npm is required.

Note: The web server needs to set the proper MIME type for *.wasm (WebAssembly) files. When using Nginx, add the following line to the types in /etc/nginx/mime.types:

application/wasm    wasm;

If you're using Apache, add the following line to /etc/apache2/mods-enabled/mime.conf:

AddType application/wasm .wasm

When using Python, something like this should work.

Building from source

You can get the source code from Github:

git clone

First, adjust the configuration in src/config.ts:

  • Set SELF_HOSTED to true
  • If you host your own SaltyRTC server, adjust the SALTYRTC_* variables
  • If you host your own STUN / TURN server, adjust the ICE_SERVERS variable

Make sure that you have the appropriate NodeJS version installed (see the .nvmrc file in the repository root).

Then, build the release version of Threema Web:

npm install --production
npm run dist

Finally, unpack the dist/threema-web-[VERSION].tar.gz archive to your web server directory. Make sure to serve Threema Web only via https. We also recommend to enable HSTS, HPKP, CSP and other available security mechanisms in your web server.

Downloading pre-built version

If you don't want to build Threema Web yourself, you can also download a pre-built release with the SELF_HOSTED variable set to true, configured to use the Threema SaltyRTC/STUN/TURN servers.

Cryptographic signatures are provided for the downloads.

Docker Image

If you're interested in hosting Threema Web through Docker, check out the docs/ file for more information.

SaltyRTC Server

For instructions on how to run your own SaltyRTC server, see

STUN / TURN Server

You can run any WebRTC-compliant STUN / TURN server, e.g. coturn.

Push Relay

While you could in theory host your own version of the push server, it won't help much since the GCM / APNs API Keys required to dispatch push notifications to the Threema app are not public.

You can review the code on Github though: