Version: 2019.1 (switch to 2019.2b or 2018.4)
Getting started with WebGL development
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WebGL Player settings

This page details the Player settings specific to the WebGLA JavaScript API that renders 2D and 3D graphics in a web browser. The Unity WebGL build option allows Unity to publish content as JavaScript programs which use HTML5 technologies and the WebGL rendering API to run Unity content in a web browser. More info
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platform. For a description of the general Player settings, see Player.

WebGL Player settings
WebGL Player settings

You can find documentation for the properties in the following sections:

Note: Although the Icon panel appears on the WebGL Player settings, there are no icon settings because WebGL games don’t use icons. Also, the only settings on the Splash Image panel are the common Splash Screen settings.

For more information about WebGL Publishing Settings, see the WebGL Building and Running page.

Resolution and Presentation

This section allows you to customize the size and style.

Resolution section for the WebGL Player platform
Resolution section for the WebGL Player platform


Setting Function
Default Canvas Width Set the width of the WebGL canvas element.
Default Canvas Height Set the width of the WebGL canvas element.
Run In Background Enable this option to allow your content to continue to run when the canvas or the browser window loses focus.

WebGL Template

Select a template to use for your WebGL Project:

  • The Default page is a simple white page with a loading bar on a grey canvas.
  • The Minimal page has only the necessary boilerplate code to run the WebGL content.

You can specify your own template so that you can run your game in a similar environment to the finished game. Follow the instructions in Using WebGL Templates.

Other Settings

This section allows you to customize a range of options organized into the following groups:


Use these settings to customize how Unity renders your game for the WebGL platform.

Rendering Player settings for the WebGL platform
Rendering Player settings for the WebGL platform
Property Function
Color Space Choose which color space should be used for rendering: Gamma or Linear.
See the Linear rendering overview for an explanation of the difference between the two.
Auto Graphics API Disable this option to manually pick and reorder the graphics APIs. By default this option is enabled, and Unity includes WebGL2.0, with WebGL1.0 as a fallback for devices where WebGL2.0 is not supported.
Static BatchingA technique Unity uses to draw GameObjects on the screen that combines static (non-moving) GameObjects into big Meshes, and renders them in a faster way. More info
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Enable this option to use Static batching.
Dynamic BatchingAn automatic Unity process which attempts to render multiple meshes as if they were a single mesh for optimized graphics performance. The technique transforms all of the GameObject vertices on the CPU and groups many similar vertices together. More info
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Enable this option to use Dynamic Batching on your build (enabled by default).
Note: Dynamic batching has no effect when a Scriptable Render Pipeline is active, so this setting is only visible when nothing is set in the Scriptable Render Pipeline Asset Graphics setting.
Graphics Jobs (Experimental) Enable this option to instruct Unity to offload graphics tasks (render loops) to worker threads running on other CPU cores. This is intended to reduce the time spent in Camera.Render on the main thread, which is often a bottleneck.
Note: This feature is experimental. It may not deliver a performance improvement for your project, and may introduce instability.
Unity currently only supports Graphics Jobs when using Vulkan and this setting has no effect when using OpenGL ES.
Lightmap Streaming Enabled Enable this option to load only the lightmap mip maps as needed to render the current game Cameras. This value applies to the lightmap textures as they are generated.
Note: To use this setting, you must enable the Texture Streaming Quality setting.
Streaming Priority Set the lightmap mip map streaming priority to resolve resource conflicts. These values are applied to the light map textures as they are generated.
Positive numbers give higher priority. Valid values range from –128 to 127.


Configuration settings for the WebGL platform
Configuration settings for the WebGL platform
Setting Function
Scripting Runtime Version Choose which .NET implementation to use in your project. For more details, see Microsoft’s .NET documentation.
.NET 3.5 Equivalent (Deprecated) A .NET runtime which implements the .NET 3.5 API. This functionality is deprecated, and should no longer be used. Please use .NET 4.
.NET 4.x Equivalent A .NET runtime which implements the .NET 4 API. This API is newer than .NET 3.5, and as such, it offers access to more APIs, is compatible with more external libraries, and supports C# 6. This is the default scripting runtime.
Scripting BackendA framework that powers scripting in Unity. Unity supports three different scripting backends depending on target platform: Mono, .NET and IL2CPP. Universal Windows Platform, however, supports only two: .NET and IL2CPP. More info
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This option is not available for WebGL because WebGL always uses the IL2CPPA Unity-developed scripting back-end which you can use as an alternative to Mono when building Projects for some platforms. More info
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Scripting backend.
API Compatibility Level Choose which .NET APIs you can use in your Project. This setting can affect compatibility with 3rd-party libraries.
Tip: If you are having problems with a third-party assembly, you can try the suggestion in the API Compatibility Level section below.
.Net 2.0 Maximum .net compatibility, biggest file sizes. Part of the deprecated .NET 3.5 runtime.
.Net 2.0 Subset Subset of full .net compatibility, smaller file sizes. Part of the deprecated .NET 3.5 runtime.
.Net Standard 2.0 Compatible with .NET Standard 2.0. Produces smaller builds and has full cross-platform support.
.Net 4.x Choose this option when using libraries that access APIs not included in .NET Standard 2.0. This option is compatible with the .NET Framework 4, which includes everything in the .NET Standard 2.0 profile as well as additional APIs.
Produces larger builds and any additional APIs available are not necessarily supported on all platforms. See Referencing additional class library assemblies for more information.
Disable HW Statistics Enable this option to instruct the application not to send information about the hardware to Unity. By default, Unity Android applications send anonymous HW statistics to Unity. This provides you with aggregated information to help you make decisions as a developer.
Scripting Define Symbols Set custom compilation flags. For more details, see Platform dependent compilation.
Allow ‘unsafe’ Code Enable support for compiling ‘unsafe’ C# code in a pre-defined assembly (for example, Assembly-CSharp.dll).
For Assembly Definition Files (.asmdef), click on one of your .asmdef files and enable the option in the Inspector window that appears.
Active Input Handling Choose how you want to handle input from users.
Input Manager Use the traditional Input settings.
Input System (Preview) Use the newer Input system. The Input System is provided as a preview packageA preview package is in development and not yet ready for production. A package in preview might be at any stage of development, from the initial stages to near completion.
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for this release. To try a preview of the Input System, install the InputSystem package.
Both Use both systems side by side.

API Compatibility Level

You can choose your mono API compatibility level for all targets. Sometimes a 3rd-party .NET library uses functionality that is outside of your .NET compatibility level. In order to understand what is going on in such cases, and how to best fix it, try following these suggestions:

  1. Install Reflector for Windows.
  2. Drag the .NET assemblies for the API compatilibity level you are having issues with into Reflector. You can find these under Frameworks/Mono/lib/mono/YOURSUBSET/.
  3. Drag in your 3rd-party assembly.
  4. Right-click your 3rd-party assembly and select Analyze.
  5. In the analysis report, inspect the Depends on section. The report highlights anything that the 3rd-party assembly depends on, but that is not available in the .NET compatibility level of your choice in red.


Optimization settings for the WebGL platform
Optimization settings for the WebGL platform
Setting Function
Prebake Collision Meshes Enable this option to add collisionA collision occurs when the physics engine detects that the colliders of two GameObjects make contact or overlap, when at least one has a rigidbody component and is in motion. More info
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data to Meshes at build time.
Keep Loaded Shaders Alive Enable this option to prevent shadersA small script that contains the mathematical calculations and algorithms for calculating the Color of each pixel rendered, based on the lighting input and the Material configuration. More info
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from being unloaded.
Preloaded Assets Set an array of Assets for the player to load on startup.
To add new Assets, increase the value of the Size property and then set a reference to the Asset to load in the new Element box that appears.
Strip Engine Code Enable code stripping. This setting is only available with the IL2CPP Scripting Backend.
Most games don’t use all necessary DLLs. With the Strip Engine Code option enabled, you can strip out unused parts to reduce the size of the built player on iOS devices. If your game is using classes that would normally be stripped out by the option you currently have selected, you’ll be presented with a Debug message when you make a build.
Managed Stripping Level Choose how aggressively Unity strips unused managed (C#) code.
When Unity builds your game or application, the Unity Linker process can strip unused code from the managed dynamically linked libraries used in the project. Stripping code can make the resulting executable significantly smaller, but can sometimes mistakenly remove code that is actually used.
Normal Remove unreachable managed code to reduce build size and .NET/IL2CPP build times.
Aggressive Remove code more aggressively than under the normal option. Code size is further reduced, but this additional reduction may have side effects. For example, some methods may no longer be visible in the debugger and code accessed through reflection can be stripped. You can create a custom link.xml file to preserve specific classes and methods. See Managed bytecode stripping with IL2CPP for more information
Vertex Compression Select which vertex channels should be compressed. For example, you can enable compression for everything except positions and lightmap UVs.
Compression can save memory and bandwidth but lowers precision. Whole Mesh compression set per imported object overrides where vertex compression is set on objects. Everything else obeys these vertex compression settings.
Optimize Mesh__ Data__ Enable this option to remove any data from Meshes that is not required by the Material applied to them (such as tangents, normals, colors, and UVs).


Select what type of logging to allow in specific contexts.

Logging settings for the WebGL platform
Logging settings for the WebGL platform

Check one box that corresponds to each Log Type (Error, Assert, Warning, Log, and Exception) when running scriptsA piece of code that allows you to create your own Components, trigger game events, modify Component properties over time and respond to user input in any way you like. More info
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(ScriptOnly) , all the time (Full), or never (None).


Enable the Clamp BlendShapes (Deprecated) option to clamp the range of Blend Shape weights in SkinnedMeshRenderers.

Legacy settings for the WebGL platform
Legacy settings for the WebGL platform

Publishing settings

Publishing settings for the WebGL platform
Publishing settings for the WebGL platform
Setting Function
Memory Size Set the memory available to the WebGL runtime, given in megabytes. You should choose this value carefully: if it is too low, you will get out-of-memory errors because your loaded content and scenesA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
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won’t fit into the available memory. However, if you request too much memory then some browser/platform combinations might not be able to provide it and consequently fail to load the player. See Memory in WebGL for details.
Enable Exceptions Choose how to handle unexpected code behavior (generally considered errors) at run time. The options are: None, Explicitly Thrown Exceptions Only, Full Without Stacktrace, and Full With Stacktrace. See the Building and running a WebGL project page for details.
Compression Format Choose the compressionA method of storing data that reduces the amount of storage space it requires. See Texture Compression3D Graphics hardware requires Textures to be compressed in specialised formats which are optimised for fast Texture sampling. More info
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, Animation CompressionThe method of compressing animation data to significantly reduce file sizes without causing a noticable reduction in motion quality. Animation compression is a trade off between saving on memory and image quality. More info
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, Audio Compression, Build Compression.
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format to use for release build files. The options are: Gzip, Brotli, or Disabled (none). Note that this option does not affect development buildsA development build includes debug symbols and enables the Profiler. More info
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Name Files As Hashes Enable this option to use an MD5 hash of the uncompressed file contents as a filename for each file in the build.
Data caching Enable this option to automatically cache your contents Asset data on the user’s machine so it doesn’t have to be re-downloaded on subsequent runs (unless the contents have changed).
Caching is implemented using the IndexedDB API provided by the browser. Some browsers may implement restrictions around this, such as asking the user for permission to cache data over a specific size.
Debug Symbols Enable this option to preserve debug symbols and perform demangling of the stack trace when an error occurs. For release builds, all the debug information is stored in a separate file which is downloaded from the server on demand when an error occurs. Development builds always have demangling support embedded in the main module and therefore are not affected by this option.
Linker Target Choose the build type to generate: asm.js, WebAssembly, or Both.
asm.js is widely supported across browsers, while WebAssembly is a new and efficient format for the web. If you choose Both, Unity generates both WebAssembly and asm.js formats. Then at run time, WebAssembly is used if it’s supported by the browser; otherwise it falls back to asm.js.
WebAssembly Streaming Enable this option to generate WebAssembly code as a .wasm file (as opposed to .unityweb). The generated code will be compiled at load-time. Make sure you set up the “application/wasm” mime type on the server to support this setting.

  • 2018–11–28 Page amended with no editorial review

  • Publishing settings updated in Unity 2017.3 NewIn20173

  • Allow ‘unsafe’ code checkbox added in Unity 2018.1

  • .NET 4.x runtime added in 2018.1

  • .Net 3.5 scripting runtime deprecated in Unity 2018.3 NewIn20183

  • WebAssembly Streaming setting added 2019.1 NewIn20191

  • Input System preview added in Unity 2019.1

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Getting started with WebGL development