Beginner Deployment & Hosting Guide for WebGL Games

Deploying a WebGL build to the web requires more than just dragging files into a folder. Mobile Safari memory restrictions, Gzip/Brotli encoding, and WebAssembly instantiation require explicit server configuration.

Step 1: Build Settings & Platform Target

Open Unity -> File -> Build Settings. Select WebGL from the platform list and click Switch Platform. Always disable Development Build before exporting production files. Development builds add ~10MB of debug overhead and expose internal profiler endpoints that cause platform rejections.

Step 2: Server Header Configuration

Modern browsers enforce SharedArrayBuffer security rules. You must configure response headers on your host (Cloudflare Pages, Vercel, or Netlify):

# Nginx Configuration for WebGL Brotli Assets
location ~ \.wasm\.br$ {
    add_header Content-Encoding br;
    add_header Content-Type application/wasm;
    add_header Cross-Origin-Opener-Policy same-origin;
    add_header Cross-Origin-Embedder-Policy require-corp;
}

Step 3: Resolving Mobile Safari Context Loss

Mobile Safari limits browser tab memory to 512MB max. Ensure your Unity WebGL Memory Size is set between 256MB and 512MB, and attach a webglcontextlost listener to handle canvas resets gracefully.

Step 4: Automated Edge Deployment

Use Cloudflare Pages CLI for zero-downtime deployments:

# Deploy static WebGL build directory
npx wrangler pages deploy ./Build --project-name=my-webgl-game