Unused packages

Unused Unity packages can add several megabytes to WebGL build even if the game does not use them.

What to check first

Remove New Input System if your game uses only old Input → this package alone adds ~2.4 MB
Delete packages that were added by default but not used:
Visual Scripting
XR / AR modules
Analytics / Ads packages if not integrated
If u use Cinemachine, remove it and use alternatives
Clean Quality and Graphics settings - built-in features like shadows pull extra shaders into the build

How to do

Example

We use an empty Unity project to test changes step by step and clearly show how each setting affects the final WebGL build size

Step 1: Create an Empty Unity project for WebGL (we will use Unity 6000.0.23f1 + Built-In Render Pipeline)

Step 2: Switch platform to WebGL and make a build to check the default size

We can see that initial build is around 9.7 MB (which is quiet too much for WEBGL)

Step 3: First thing to do! Go to build settings and change “Code Optimization: Build Size with LTO”

We have already - Build size 9MB

Step 4: Go to Player Settings → set Compression: Brotli and enable Name files as hashes

Now it’s 6.8mb so we are already optimized unity build from 9.7mb to 6.8mb, let’s go further

Step 5: Now let’s change IL2CPP Code Generation to “Smaller Builds” and change C++ Compiler Configuration to Master

Step 6: Choose texture compression (ASTC / DXT / ETC2). Enable Crunch for textures when possible

Step 7: Set Color Space: Gamma if the game supports it (≈100 KB saving)

Step 8: Set Managed Stripping Level: High. Test the game after enabling - stripping may remove required code

Also enable texture mipmap stripping

Step 9: Remove unused features and packages

New Input System adds ~2.4 MB. If the project does not use it, remove the package to reduce the build to ~2.2 MB.

So Finally we got from the initial 10MB to 2.2MB

Last updated 7 hours ago