How can I reduce my Unity WebGL playable ad build from 13 MB to under 5 MB for Google Ads?

[CodeSmile]

Last time I checked, it took some serious pulling to get below 5 MB even without any content in the project.

Managed Stripping Level can’t be on, there’s multiple levels. Make sure it uses High but this may crash depending on the code and assets in the project.

Logo needs to be disabled by first disabling the logo, then disabling the splashscreen. Otherwise the logo image will still be in the build.

Reducing texture quality is most effective at reducing build size, but comes at a loss of quality.

Check the build report after making a build in the editor.log for details.

These threads have pointers:

WebGL builds for mobile

After the nice blog post about WebAssembly now being officially supported and smaller and better than ever, I thought I might give it a spin to see for myself how good it works. I was quite surprised to see that the brotli compression compressed better than gzip. You can see the small test I did here: GitHub - JohannesDeml/UnityWebGL-LoadingTest: Unity WebGL platform and version comparisons with a lot of nice extras My experience: Building times are still crazy long, that’s not really fun, e…

Smallest possible WebGL build size?

Has anyone ever tested this? For arguments sake lets say there are zero assets in the project. One simple scene being built with nothing except a camera and directional light. With the highest compression and stripping what would the smallest possible webgl size be? Have optimized every single asset dowe to the kilobyte but am left with huge UnityEngine DLLs clogging up the build. Current build size is 18MB and System DLLs, Script DLLs, and UnityEngine take about 12MB.