WebGL build in Unity - Step-by-Step Execution

Concept Flow - WebGL build

Open Unity Project

↓

Select Build Settings

↓

Choose WebGL Platform

↓

Switch Platform

↓

Configure Player Settings

↓

Click Build

↓

Unity Compiles and Exports WebGL Files

↓

Host Files on Web Server or Local

↓

Open WebGL Build in Browser

This flow shows how to create a WebGL build in Unity, from opening the project to running the build in a browser.

Execution Sample

Unity

1. Open Unity project
2. File > Build Settings
3. Select WebGL platform
4. Click Switch Platform
5. Click Build and choose folder
6. Wait for build to finish

Steps to create a WebGL build from Unity editor.

Execution Table

Step	Action	Unity Response	Result
1	Open Unity project	Project loads	Ready for build
2	Open Build Settings	Build Settings window opens	Can select platform
3	Select WebGL platform	WebGL platform highlighted	Ready to switch
4	Click Switch Platform	Unity switches build target	WebGL set as target
5	Click Build	Build dialog opens	Choose folder to save
6	Confirm folder and start build	Unity compiles and exports files	WebGL build created
7	Open index.html in browser	Browser loads WebGL content	Game runs in browser
Exit	Build complete	No errors	Process ends

💡 Build completes successfully and WebGL files are ready to run in a browser.

Variable Tracker

Variable	Start	After Step 4	After Step 6	Final
Build Target	Standalone	WebGL	WebGL	WebGL
Build Folder	None	None	User selected folder	User selected folder
Build Status	Not started	Switching platform	Building	Completed

Key Moments - 3 Insights

Why do I need to switch platform to WebGL before building?

Unity requires switching the build target to WebGL to prepare the project and assets correctly for the WebGL environment, as shown in step 4 of the execution_table.

What happens if I try to build without switching platform?

Unity will build for the currently selected platform, not WebGL, so the output won't run in a browser. The execution_table shows switching platform is necessary before building.

Where do the WebGL build files go?

You choose the folder during the build step (step 5 and 6). The variable_tracker shows 'Build Folder' changes from None to the user-selected folder.

Visual Quiz - 3 Questions

Look at the execution_table, at which step does Unity switch the build target to WebGL?

A Step 4

B Step 3

C Step 5

D Step 6

💡 Hint

Check the 'Unity Response' column for 'Unity switches build target' in step 4.

According to variable_tracker, what is the 'Build Status' after step 6?

A Not started

B Switching platform

C Building

D Completed

💡 Hint

Look at the 'Build Status' row under 'After Step 6' column.

If you skip step 4 and build immediately, what will happen according to the key_moments?

A Build will fail with an error

B Build will create files for the current platform, not WebGL

C Build will create WebGL files anyway

D Unity will automatically switch platform

💡 Hint

Refer to the second key moment about building without switching platform.

Concept Snapshot

WebGL build in Unity:
1. Open Build Settings
2. Select and switch to WebGL platform
3. Configure player settings if needed
4. Click Build and choose folder
5. Unity compiles and exports WebGL files
6. Run index.html in browser to play

Full Transcript

To create a WebGL build in Unity, first open your project and go to File > Build Settings. Select the WebGL platform and click Switch Platform to prepare the project. Then click Build, choose a folder to save the files, and wait for Unity to compile and export the WebGL build. Finally, open the generated index.html file in a web browser to run your game. Switching platform is important to ensure the build targets WebGL correctly. The build files are saved in the folder you select during the build step.

Practice

1. What is the main purpose of creating a WebGL build in Unity?

easy

A. To export games as console packages

B. To create mobile apps for Android and iOS

C. To run Unity games directly in web browsers without installation

D. To build desktop applications for Windows and Mac

Solution

1. Step 1: Understand WebGL build purpose

   WebGL build allows Unity games to run inside web browsers without needing users to install anything.

2. Step 2: Compare with other build targets

   Other build targets like Android or desktop require installation, unlike WebGL.

3. Final Answer:

   To run Unity games directly in web browsers without installation -> Option C

4. Quick Check:

   WebGL build = run in browser [OK]

Hint: WebGL = play games in browser, no install needed [OK]

Common Mistakes:

• Confusing WebGL with mobile or desktop builds
• Thinking WebGL requires app installation
• Assuming WebGL builds are for consoles

2. Which Unity menu option do you use to switch your project to WebGL build target?

easy

A. Window > Package Manager

B. Edit > Preferences

C. File > New Project

D. File > Build Settings

Solution

1. Step 1: Locate build target settings

   Unity uses the Build Settings window to select and switch build targets like WebGL.

2. Step 2: Confirm correct menu path

   The Build Settings window is accessed via File > Build Settings, not other menus.

3. Final Answer:

   File > Build Settings -> Option D

4. Quick Check:

   Switch build target = Build Settings [OK]

Hint: Build Settings is where you pick WebGL target [OK]

Common Mistakes:

• Choosing Edit > Preferences which is for editor settings
• Selecting Window > Package Manager which manages packages
• Confusing File > New Project with build settings

3. After building a Unity WebGL project, which file do you open in a browser to start the game?

medium

A. game.exe

B. index.html

C. main.unity

D. build.json

Solution

1. Step 1: Identify WebGL build output files

   Unity WebGL build creates an index.html file to launch the game in browsers.

2. Step 2: Understand file roles

   Other files like .exe or .unity are not used for WebGL browser launch.

3. Final Answer:

   index.html -> Option B

4. Quick Check:

   Open index.html to run WebGL game [OK]

Hint: Open index.html to play WebGL game in browser [OK]

Common Mistakes:

• Trying to open .exe files which are for desktop
• Confusing build.json as launch file
• Attempting to open .unity files directly

4. You built your Unity project for WebGL but the game does not load in the browser. What is a common cause?

medium

A. Not running a local or remote web server to serve the files

B. Using the wrong Unity version for WebGL

C. Forgetting to save the scene before building

D. Not installing the WebGL module in Unity Hub

Solution

1. Step 1: Understand WebGL file loading requirements

   WebGL builds require serving files via a web server; opening index.html directly from file system often fails due to browser security.

2. Step 2: Check other options

   While Unity version and modules matter, the most common cause is missing a web server.

3. Final Answer:

   Not running a local or remote web server to serve the files -> Option A

4. Quick Check:

   WebGL needs web server to load files [OK]

Hint: Always use a web server to test WebGL builds [OK]

Common Mistakes:

• Opening index.html directly without server
• Ignoring Unity Hub WebGL module installation
• Assuming saving scene fixes loading issues

5. You want to optimize your Unity WebGL build to reduce loading time. Which approach helps achieve this?

hard

A. Enable Compression Format (e.g., gzip or Brotli) in Player Settings

B. Increase texture resolution for better quality

C. Add more scenes to the build to preload content

D. Disable WebGL memory size limit in Player Settings

Solution

1. Step 1: Identify optimization methods for WebGL loading

   Compression formats like gzip or Brotli reduce file sizes, speeding up downloads and load times.

2. Step 2: Evaluate other options

   Increasing texture resolution or adding more scenes increases load size; disabling memory limits can cause crashes.

3. Final Answer:

   Enable Compression Format (e.g., gzip or Brotli) in Player Settings -> Option A

4. Quick Check:

   Compression reduces WebGL load time [OK]

Hint: Use compression to shrink WebGL build files [OK]

Common Mistakes:

• Increasing texture size which slows loading
• Adding many scenes unnecessarily
• Disabling memory limits causing instability