Gzip and Brotli are the two data compression programs that you can use when building Unity WebGL. If you don't know how to convert your project to unity WebGL then, feel free to follow my Unity WebGL conversion guide tutorial.
In unity, you have two options in WebGL to choose a specific compression format. Remember there is also an option to disable WebGL compression besides Gzip and Bortli compression. By disabling the compression in the Unity3d WebGL setting, you save build processing (faster build development) time but it will increase the size of the WebGL build.
Therefore currently unity WebGL provides you two options for build compression. In this unity tutorial, I will explain both differences.
Gzip vs Brotli Comparision Table
| Gzip | Brotli |
|---|---|
| Build files are bigger | Build Files size is smaller |
| Faster Build time | Slow build time |
| Natively support on all browsers using HTTP/HTTPS | Natively support on Firefox & Chrome only with HTTPS |
You can check your chosen compression format compatibility on caniuse website. Make sure the target browser supports your build compression format. Also, you may get "Unable to parse Build/HTML5.framework.js.gz!". This happens due to some configuration files missing on the server. Here is the solution.
Read More: Unity WebGL technical Breakdown.
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