Unity Webgl Extreme Race (2025)

FAQs

Does Unity still support WebGL? ›

Note: Unity no longer provides support for WebGL 1 in builds created with the Auto Graphics API option.

Enable Data caching so that Unity caches your contents asset data on the user's machine. Data caching can make the application run faster.

That 2GB limit is imposed by the browser for each tab, and this includes memory for everything on that tab - cache, images, html, javascript, the unity app and so on.

Compression Format

Brotli compression offers the best compression ratios. Brotli compressed files are smaller than gzip, but take a longer time to compress, which increases your iteration times on release builds. Chrome and Firefox only natively support Brotli compression over HTTPS.

WebGPU is a JavaScript API provided by a web browser that enables webpage scripts to efficiently utilize a device's graphics processing unit (GPU). This is achieved with the underlying Vulkan, Metal, or Direct3D 12 system APIs. On relevant devices, WebGPU is intended to supersede the older WebGL standard.

WebGL builds use IL2CPP so you experience the kind of compilation a C++ developer would. It's normal, unfortunately. Fortunately, incremental builds will be faster. You also have the option to optimize for build time rather than runtime speed or size, which helps a bit.

Optimize “Lots of Objects” rendering

Render calls are performed for each object that needs to be drawn and are quite resource intensive. Therefore, it is always advisable to minimize the number of draw calls. This can be achieved through combining similar objects by merging their geometries.

Opening a project,

Unity generally imports assets upfront, and that's why opening a project for the first time can take hours. You could run into a smaller version of the same problem when you work in a team, pull in the latest changes, and now have a handfull (hundreds?) of changes to assets.

Technical overview. To run in WebGL, all code needs to be JavaScript. We use the emscripten compiler toolchain to cross-compile the Unity runtime code (written in C and C++) into asm. js JavaScript.

WebGL is supported on Chrome. Opening local files is not supported in the webplayer due to security reasons; I expect the same for WebGL. Chrome does not support WebGL content from file:// urls - Use Build & Run, or upload it to a server - or use Firefox.

How do I run WebGL build locally in Unity? ›

The best way to view the WebGL Player locally is to use Unity's Build And Run option (menu: File > Build And Run). Unity uses a local web server to host your build, and opens it from a localhost URL. Alternatively, you can use a custom local web server with properly configured response headers.

- WebGL: Unity stores up to 1MB of PlayerPrefs data using the browser's IndexedDB API. For more information, see IndexedDB.

Unity has the ability to use DirectX 11 and OpenGL Core graphics APIs, with all the features that you expect from them: compute shaders, tessellation shaders, shader model 5.0 and so on.

To create a build for WebGL, go to File > Build Settings from Unity's main menu. In the Platform list, select WebGL and then click Switch Platform. For Build Settings, refer to WebGL Build Settings.

If that doesn't help, try creating a new, empty project with your Unity version and try to upload that. If it works, close the editor and copy the contents of ProjectSettings over to the new project. Open the project, build and deploy again to see if it still works. If it fails, you know it's because of some setting.

Unity web player has been discontinued for quite a long time now. There is absolutely no reason to waste your time developing for an obsolete platform.

Software. WebGL is widely supported by modern browsers.