How to Build Unity Projects for WebGL Deployment

To build a Unity project for the web, open the Build Settings, select WebGL as the target platform, then click Build or Build and Run. Unity will compile your project into web-friendly files that can be hosted on a web server and run in modern browsers.

Syntax

Building for Web in Unity involves these main steps:

• Open Build Settings: Access via File > Build Settings.
• Select Platform: Choose WebGL from the platform list.
• Switch Platform: Click Switch Platform to prepare the project for WebGL.
• Build: Click Build to export files or Build and Run to build and launch in a browser.

This process converts your Unity project into HTML, JavaScript, and data files suitable for web browsers.

unity

File > Build Settings > Select WebGL > Switch Platform > Build or Build and Run

Example

This example shows how to build a simple Unity scene for WebGL:

• Create a new Unity project.
• Add a 3D object like a cube.
• Open Build Settings, select WebGL, and switch platform.
• Click Build and Run.

Unity will compile the project and open it in your default web browser.

plaintext

// No scripting code needed for build process
// Steps are done via Unity Editor UI

Output

A browser window opens showing your Unity scene running as a WebGL app.

Common Pitfalls

Common mistakes when building for WebGL include:

• Not switching the platform to WebGL before building, causing build errors.
• Using unsupported plugins or APIs that don't work in WebGL.
• Ignoring WebGL memory size settings, which can cause crashes or slow loading.
• Trying to run the build files directly from the file system instead of a web server, leading to loading errors.

Always test your WebGL build on a local or remote web server.

plaintext

/* Wrong: Building without switching platform */
// Result: Build fails or creates wrong files

/* Right: Switch platform first */
File > Build Settings > Select WebGL > Switch Platform > Build

Quick Reference

Step	Action	Notes
1	Open Build Settings	File > Build Settings
2	Select WebGL	Choose WebGL platform
3	Switch Platform	Prepare project for WebGL
4	Build or Build and Run	Exports files and optionally runs in browser
5	Host files on web server	Use local server or upload to hosting

Key Takeaways

Always switch the build platform to WebGL before building your project.

Test WebGL builds on a web server, not directly from local files.

Avoid using unsupported plugins or APIs in WebGL builds.

Adjust WebGL memory size in Player Settings if your project is large.

Use Build and Run to quickly test your WebGL build in a browser.