An HTML5 Mumble client
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mumble-web is an HTML5 Mumble client for use in modern browsers.

A live demo is running here.

The Mumble protocol uses TCP for control and UDP for voice. Running in a browser, both are unavailable to this client. Instead Websockets are used for all communications.

libopus, libcelt (0.7.1) and libsamplerate, compiled to JS via emscripten, are used for audio decoding. Therefore, at the moment only the Opus and CELT Alpha codecs are supported.

Quite a few features, most noticeably all administrative functionallity, are still missing.



mumble-web can either be installed directly from npm with npm install -g mumble-web or from git:

git clone
cd mumble-web
npm install
npm run build

The npm version is prebuilt and ready to use whereas the git version allows you to e.g. customize the theme before building it.

Either way you will end up with a dist folder that contains the static page.


At the time of writing this there do not seem to be any Mumble servers which natively support Websockets. To use this client with any standard mumble server, websockify must be set up (preferably on the same machine that the Mumble server is running on).

You can install websockify via your package manager apt install websockify or manually from the websockify GitHub page. Note that while some versions might function better than others, the python version generally seems to be the best.

There are two basic ways you can use websockify with mumble-web:

  • Standalone, use websockify for both, websockets and serving static files
  • Proxied, let your favorite web server serve static files and proxy websocket connections to websockify

This is the simplest but at the same time least flexible configuration.

websockify --cert=mycert.crt --key=mykey.key --ssl-only --ssl-target --web=path/to/dist 443 mumbleserver:64738

This configuration allows you to run websockify on a machine that already has another webserver running.

websockify --ssl-target 64737 mumbleserver:64738

A sample configuration for nginx that allows access to mumble-web at and connecting at wss:// (similar to the demo server) looks like this:

server {
        listen 443 ssl;
        ssl_certificate /etc/letsencrypt/live/;
        ssl_certificate_key /etc/letsencrypt/live/;

        location / {
                root /path/to/dist;
        location /demo {
                proxy_pass http://websockify:64737;
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection $connection_upgrade;

map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;


The default theme of mumble-web tries to mimic the excellent MetroMumbleLight theme. mumble-web also includes a dark version, named MetroMumbleDark, which is heavily inspired by MetroMumble's dark version.

To select a theme other than the default one, append a theme=dark query parameter (where dark is the name of the theme) when accessing the mumble-web page. E.g. thisis the live demo linked above but using the dark theme (dark is an alias for MetroMumbleDark).

Custom themes can be created by deriving them from the MetroMumbleLight/Dark themes just like the MetroMumbleDark theme is derived from the MetroMumbleLight theme.