Version: 2021.3
Advanced overview
Developing for WebGL

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 settings.

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 do not use icons.

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

Resolution and Presentation

This section allows you to customize the screen mode and default size.

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

Resolution

Setting Function
Default Canvas Width Set the width of the WebGL canvas element.
Default Canvas Height Set the height 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.

Splash Image

Use the Virtual Reality Splash Image setting to select a custom splash image for XRAn umbrella term encompassing Virtual Reality (VR), Augmented Reality (AR) and Mixed Reality (MR) applications. Devices supporting these forms of interactive applications can be referred to as XR devices. More info
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displays. For information on common Splash Screen settings, see Splash Screen.

Splash screen settings for virtual reality.
Splash screen settings for virtual reality.

Other Settings

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

Rendering

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 Description
Color Space Choose which color space Unity uses for rendering: Gamma or Linear. See the Linear rendering overview for an explanation of the difference between the two.
Gamma: Gamma color space is typically used for calculating lighting on older hardware restricted to 8 bits per channel for the framebuffer format. Even though monitors today are digital, they might still take a gamma-encoded signal as input.
Linear: Linear color space rendering gives more precise results. When you select to work in linear color space, the Editor defaults to using sRGB sampling. If your Textures are in linear color space, you need to work in linear color space and disable sRGB sampling for each Texture.
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 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.
Lightmap Encoding Choose Normal Quality or High Quality to set the lightmap encoding. This setting affects the encoding scheme and compression format of the lightmaps.
Lightmap Streaming Whether to use Mipmap Streaming for lightmaps. Unity applies this setting to all lightmaps when it generates them.
Note: To use this setting, you must enable the Texture Streaming Quality setting.
  Streaming Priority Set the priority for all lightmaps in the Mipmap Streaming system. Unity applies this setting to all lightmaps when it generates them.
Positive numbers give higher priority. Valid values range from –128 to 127.
Frame Timing Stats Enable this property to gather CPU and GPU frame time statistics. Use this together with the Dynamic ResolutionA Camera setting that allows you to dynamically scale individual render targets, to reduce workload on the GPU. More info
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camera setting to determine if your application is CPU or GPU bound.
Virtual Texturing Indicates whether to enable Virtual Texturing.
Note: The Unity Editor requires a restart for this setting to take effect.
Shader precision model Controls the default precision of samplers used in shaders. See Shader data types and precision for more details.
360 Stereo Capture Indicates whether Unity can capture stereoscopic 360 images and videos. When enabled, Unity compiles additional shader variants to support 360 capture (currently only on Windows/OSX). When enabled, enable_360_capture keyword is added during the Stereo RenderCubemap call. Note that this keyword is not triggered outside the Stereo RenderCubemap function. For more information, see Stereo 360 Image and Video Capture.

Configuration

Configuration settings for the WebGL platform
Configuration settings for the WebGL platform
Setting Function
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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Choose the scripting backend you want to use. The scripting backend determines how Unity compiles and executes C# code in your Project.
Mono Compiles C# code into .NET Common Intermediate Language (CIL) and executes that CIL using a Common Language Runtime. See the Mono Project website for more information.
IL2CPP Compiles C# code into CIL, converts the CIL to C++ and then compiles that C++ into native machine code, which executes directly at run time. See 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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for more information.
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 Standard Compatible with .NET Standard 2.0. Produces smaller builds and has full cross-platform support.
.Net Framework Compatible with the .NET Framework 4 (which includes everything in the .NET Standard 2.0 profile as well as additional APIs). Choose this option when usng libraries that access APIs not included in .NET Standard 2.0. Produces larger builds and any additional APIs available are not necessarily supported on all platforms. See Referencing additional class library assemblies for more information.
C++ Compiler Configuration Choose the C++ compiler configuration used when compiling IL2CPP generated code.
Note: This property is disabled unless Scripting Backend is set to IL2CPP.
Use incremental GC Enable this to use the incremental garbage collector, which spreads garbage collection over several frames to reduce gc-related spikes in frame duration.
Active Input Handling Choose how you want to handle input from users.
Input Manager (old) Use the default Input window.
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’s outside of your .NET compatibility level. To understand what’s going on in such cases, and how to best fix it, try following these suggestions:

  1. Install ILSpy for Windows.
  2. Drag the .NET assemblies for the API compatilibity level that you are having issues with into ILSpy. 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.

Script Compilation

Script compilation settings for the WebGL platform
Script compilation settings for the WebGL platform
Setting Function
Scripting Define Symbols Set custom compilation flags. For more details, see the documentation on Platform dependent compilation.
Additional Compiler Arguments Add entries to this list to pass additional arguments to the Roslyn compiler. Use one new entry for each additional argument.
To create a new entry, press the ‘+’ button. To remove an entry, press the ‘-’ button.
When you have added all desired arguments, click the Apply button to include your additional arguments in future compilations.The Revert button resets this list to the most recent applied state.
Suppress Common Warnings Disable this setting to display the C# warnings CS0169 and CS0649.
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.
Use Deterministic Compilation Disable this setting to prevent compilation with the -deterministic C# flag. With this setting enabled, compiled assemblies are byte-for-byte identical each time they are compiled.
For more information, see Microsoft’s deterministic compiler option documentation.
Enable Roslyn Analyzers Disable this setting to compile user-written 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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without Roslyn analyzer DLLs that might be present in your project.
Use Roslyn Reference Assemblies Disable this setting to the compiler not to skip compilation reference assemblies when the metadata of the assembly does not change.

Optimization

Optimization settings for the WebGL platform
Optimization settings for the WebGL platform
Property Description
Prebake Collision Meshes Enable this option to add collision data to Meshes at build time.
Keep Loaded Shaders Alive When enabled, you cannot unload a shader. See Shader Loading for more information.
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, then set a reference to the Asset to load in the new Element box that appears.
AOT compilation options Additional options for Ahead of Time (AOT) compilation. This helps optimize the size of the built iOS player.
Strip Engine Code Enable this option if you want the Unity Linker tool to remove code for Unity Engine features that your Project doesn’t use. This setting is only available with the IL2CPP scripting backend.

Most apps don’t use every available DLL. This option strips out DLLs that your app doesn’t use to reduce the size of the built Player. If your app is using one or more classes that would normally be stripped out under your current settings, Unity displays a debug message when you try to build the app.
Managed Stripping Level Choose how Unity strips unused managed (C#) code.The options are Disabled Low, Medium, and High.

When Unity builds your app, the Unity Linker process can strip unused code from the managed DLLs your Project uses. Stripping code can make the resulting executable significantly smaller, but can sometimes accidentally remove code that is in use. For more information about these options, see documentation on Managed code stripping.

For information about bytecode stripping with IL2CPP, see documentation on Managed bytecode stripping with IL2CPP.
Vertex Compression Choose the channel that you want to set for compressing meshes under the vertex compression method, which by default, is set to Mixed. This affects all the meshes in your project. Typically, Vertex Compression is used to reduce the size of mesh data in memory, reduce file size, and improve GPU performance. For information on how to configure vertex compression and limitations of this setting, see [compressing meshes].
Optimize Mesh Data Selecting this option enables stripping of unused vertex attributes from the mesh used in a build.
This reduces the amount of data in the mesh, which might help reduce build size, loading times, and runtime memory usage. However, you must remember to not change material or shader settings at runtime, if you have this setting enabled. See PlayerSettings.stripUnusedMeshComponents for more information.
Texture MipMap Stripping Enable this option to enable mipmap stripping for all platforms, which strips unused mipmaps from Textures at build time. Unity determines unused mipmaps by comparing the value of the mipmap against the Quality Settings for the current platform. If a mipmap value is excluded from every Quality Setting for the current platform, then Unity strips those mipmaps from the build at build time. If QualitySettings.masterTextureLimit is set to a mipmap value that has been stripped, Unity will set the value to the closest mipmap value that has not been stripped.

Logging

Select what type of logging to allow in specific contexts.

Logging settings for the WebGL platform
Logging settings for the WebGL platform
  • Select your preferred logging method from the available options.

  • Check a box that corresponds to each Log Type (Error, Assert, Warning, Log, and Exception) based on the type of logging you require. For example:
    • ScriptOnly: Logs only when running scripts.
    • Full: Logs all the time.
    • None: No logs are ever recorded.

    See stack trace logging for more information.

Legacy

Enable the Clamp BlendShapes (Deprecated) option to clamp the range of blend shape weights in Skinned Mesh Renderers.

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

Publishing settings

Use the Publishing Settings to configure how Unity builds your WebGL app. For example, you can choose to enable the browser cache to store its files in your build.

Publishing settings for the WebGL platform
Publishing settings for the WebGL platform
Setting Function
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 Compression, Animation Compression, 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 (displaying the original function names) 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.
Decompression Fallback Include decompression fallback code for build files in the loader. Use this option if you are not able to configure server response headers according to the selected compression method.
Advanced overview
Developing for WebGL