Attention: Here be dragons

This is the latest (unstable) version of this documentation, which may document features not available in or compatible with released stable versions of Redot.

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Compiling for the Web¶

Requirements¶

To compile export templates for the Web, the following is required:

Building export templates¶

Before starting, confirm that emcc is available in your PATH. This is usually configured by the Emscripten SDK, e.g. when invoking emsdk activate and source ./emsdk_env.sh/emsdk_env.bat.

Open a terminal and navigate to the root directory of the engine source code. Then instruct SCons to build the Web platform. Specify target as either template_release for a release build or template_debug for a debug build:

scons platform=web target=template_release
scons platform=web target=template_debug

By default, the JavaScriptBridge singleton will be built into the engine. Official export templates also have the JavaScript singleton enabled. Since eval() calls can be a security concern, the javascript_eval option can be used to build without the singleton:

scons platform=web target=template_release javascript_eval=no
scons platform=web target=template_debug javascript_eval=no

By default, WebWorker threads support is enabled. To disable it and only use a single thread, the threads option can be used to build the web template without threads support:

scons platform=web target=template_release threads=no
scons platform=web target=template_debug threads=no

The engine will now be compiled to WebAssembly by Emscripten. Once finished, the resulting file will be placed in the bin subdirectory. Its name is godot.web.template_release.wasm32.zip for release or godot.web.template_debug.wasm32.zip for debug.

Finally, rename the zip archive to web_release.zip for the release template:

mv bin/godot.web.template_release.wasm32.zip bin/web_release.zip

And web_debug.zip for the debug template:

mv bin/godot.web.template_debug.wasm32.zip bin/web_debug.zip

GDExtension¶

The default export templates do not include GDExtension support for performance and compatibility reasons. See the export page for more info.

You can build the export templates using the option dlink_enabled=yes to enable GDExtension support:

scons platform=web dlink_enabled=yes target=template_release
scons platform=web dlink_enabled=yes target=template_debug

Once finished, the resulting file will be placed in the bin subdirectory. Its name will have _dlink added.

Finally, rename the zip archives to web_dlink_release.zip and web_dlink_release.zip for the release template:

mv bin/godot.web.template_release.wasm32.dlink.zip bin/web_dlink_release.zip
mv bin/godot.web.template_debug.wasm32.dlink.zip bin/web_dlink_debug.zip

Building the editor¶

It is also possible to build a version of the Redot editor that can run in the browser. The editor version is not recommended over the native build. You can build the editor with:

scons platform=web target=editor

Once finished, the resulting file will be placed in the bin subdirectory. Its name will be godot.web.editor.wasm32.zip. You can upload the zip content to your web server and visit it with your browser to use the editor.

Refer to the export page for the web server requirements.

Tip

The Redot repository includes a Python script to host a local web server. This can be used to test the web editor locally.

After compiling the editor, extract the ZIP archive that was created in the bin/ folder, then run the following command in the Redot repository root:

# You may need to replace `python` with `python3` on some platforms.
python platform/web/serve.py

This will serve the contents of the bin/ folder and open the default web browser automatically. In the page that opens, access godot.tools.html and you should be able to test the web editor this way.

Note that for production use cases, this Python-based web server should not be used. Instead, you should use an established web server such as Apache or nginx.