WebGL Player settings

Use Player settings to know how Unity buildsThe process of compiling your project into a format that is ready to run on a specific platform or platforms. More info
See in Glossary and displays your final 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
See in Glossary application. For a description of the general Player settings, refer to Player settings.

To access the WebGL Player settingsSettings that let you set various player-specific options for the final game built by Unity. More info
See in Glossary:

• From the Unity main menu, go to Edit > Project Settings > Player. The Player settings window appears.
• Select the WebGL tab to view the WebGL Player settings.

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

• Resolution and Presentation
• Splash Image
• Other Settings
• Publishing Settings

Note: Although the Icon panel appears on the WebGL Player settings, there are no icon settings available because WebGL games don’t use icons.

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

Resolution and Presentation

Use the Resolution and Presentation section to customize the aspects of the screen’s appearance in the Resolution section.

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.
• The PWA page has a Progressive Web AppA software application that’s delivered through the web. It uses certain browser features to create a user experience on par with a native application. More info
  See in Glossary including a web manifest file and service worker code.

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
See in Glossary displays. For information on common Splash Screen settings, see Splash Screen.

Other Settings

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

• Rendering
• Configuration
• Shader Variant Loading
• Optimization
• Stack Trace
• Legacy

Rendering

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

Setting		Function
Color Space		Choose what color space to use for rendering: Gamma or Linear. See 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 isn’t 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 See in Glossary		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 See in Glossary		Check this box to use Dynamic Batching on your build (enabled by default).
Graphics Jobs		Enable this option to instruct Unity to offload graphics tasks (render loops) to worker threads running on other CPU cores. Use it to reduce the time spent in Camera.Render on the main thread, which is often a bottleneck. Note: This feature is experimental. It might not deliver a performance improvement for your project, and might introduce new crashes.
Texture compressionA method of storing data that reduces the amount of storage space it requires. See Texture Compression, Animation Compression, Audio Compression, Build Compression. See in Glossary format		Choose DXT, ETC2, or ASTC to set the texture compression3D Graphics hardware requires Textures to be compressed in specialized formats which are optimized for fast Texture sampling. More info See in Glossary format for WebGL. For information on how to pick the right format, refer to Texture compression format overview and to learn how to create builds for desktop and mobile browsers from a script, refer to Texture Compression in WebGL.
Lightmap Encoding		Choose Low Quality, Normal Quality, or High Quality to set the lightmapA pre-rendered texture that contains the effects of light sources on static objects in the scene. Lightmaps are overlaid on top of scene geometry to create the effect of lighting. More info See in Glossary encoding. This setting affects the encoding scheme and compression format of the lightmaps.
HDRhigh dynamic range See in Glossary CubemapA collection of six square textures that can represent the reflections in an environment or the skybox drawn behind your geometry. The six squares form the faces of an imaginary cube that surrounds an object; each face represents the view along the directions of the world axes (up, down, left, right, forward and back). More info See in Glossary Encoding		Choose Low Quality, Normal Quality, or High Quality to set the HDR Cubemap encoding. This setting affects the encoding scheme and compression format of the HDR Cubemaps.
Lightmap Streaming Enabled		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 option to gather CPU/GPU frame timing statistics.
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 shadersA program that runs on the GPU. More info See in Glossary. 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.
Load/Store Action Debug Mode		Highlights undefined pixelsThe smallest unit in a computer image. Pixel size depends on your screen resolution. Pixel lighting is calculated at every screen pixel. More info See in Glossary that might cause rendering problems in your built application. The highlighting appears only in the Game view, and your built application if you select Development BuildA development build includes debug symbols and enables the Profiler. More info See in Glossary in Build Settings. See LoadStoreActionDebugModeSettings.
	Editor Only	Highlights undefined pixels in the Game view, but not in your built application.

Configuration

Property		Description
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 See in Glossary		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. For more information, refer to the MonoA scripting backend used in Unity. More info See in Glossary page.
	IL2CPP	Compiles C# code into CIL, converts the CIL to C++ and then compiles that C++ into native machine code, which executes directly at runtime. Refer to IL2CPPA Unity-developed scripting back-end which you can use as an alternative to Mono when building projects for some platforms. More info See in Glossary for more information.
API Compatibility Level	Choose which .NET APIs you can use in your project. This setting can affect compatibility with third-party libraries. However, it has no effect on Editor-specific code (code in an Editor directory, or within an Editor-specific Assembly Definition). 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 2.1	Compatible with .NET Standard 2.1. 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 plus additional APIs). Choose this option when using libraries that access APIs not included in .NET Standard 2.0. Produces larger builds and any additional APIs available aren’t necessarily supported on all platforms. Refer to Referencing additional class library assemblies for more information.
IL2CPP Code Generation		Defines how Unity manages IL2CPP code generation. This option is only available if you use the IL2CPP scripting backend.
	Faster runtime	Generates code optimized for runtime performance. This setting is activated by default.
	Faster (smaller) builds	Generates code optimized for build size and iteration. This setting generates less code and produces a smaller build, but can reduce runtime performance for generic code. Use this option when faster build times are important, such as when iterating on changes.
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		Uses the incremental garbage collector, which spreads garbage collection over several frames to reduce garbage collection-related spikes in frame duration. For more information, refer to Automatic Memory Management.
Allow downloads over HTTP	Indicates whether to allow downloading content over HTTP. The options are Not allowed, Allowed in Development builds only, and Always allowed. The default option is Not allowed due to the recommended protocol being HTTPS, which is more secure.
Active Input Handling	Choose how to handle input from users.
	Input Manager (old)	Use the default Input window.
	Input System Package (New)	Use the newer Input system. To try the new Input System, install the InputSystem package.
	Both	Use both systems side by side.

Shader Variant Loading

Use these settings to control how much memory shaders use at runtime.

Property	Description
Default chunk size (MB)	Sets the maximum size of compressed shader variant data chunks Unity stores in your built application for all platforms. The default is 16. For more information, refer to Shader loading.
Default chunk count	Sets the default limit on how many decompressed chunks Unity keeps in memory on all platforms. The default is 0, which means there’s no limit.
Override	Enables overriding Default chunk size and Default chunk count for this build target.
Chunk size (MB)	Overrides the value of Default chunk size (MB) on this build target.
Chunk count	Overrides the value of Default chunk count on this build target.

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 the problematic files 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’s not available in the .NET compatibility level of your choice in red.

Script Compilation

Property	Description
Scripting Define Symbols	Sets custom compilation flags. For more details, refer to Platform dependent compilation.
Additional Compiler Arguments	Adds 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, click Add (+). To remove an entry, click Remove (-). When you have added all desired arguments, click Apply to include your additional arguments in future compilations. Click Revert to reset this list to the most recent applied state.
Suppress Common Warnings	Indicates whether to display the C# warnings CS0169 and CS0649.
Allow ‘unsafe’ Code	Enables 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	Indicates whether to prevent compilation with the -deterministic C# flag. With this setting enabled, compiled assemblies are byte-for-byte the same each time they’re compiled. For more information, refer to C# Compiler Options that control code generation.

Optimization

Property	Description
Prebake Collision Meshes	Adds collision data to Meshes at build time.
Preloaded Assets	Sets 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 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 do not 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	Chooses how aggressively Unity strips unused managed (C#) code. 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 smaller, but can sometimes remove code that’s in use. For more information about these options and bytecode stripping with IL2CPP, refer to ManagedStrippingLevel.
	Minimal	Use this to strip class libraries, UnityEngine, Windows Runtime assemblies, and copy all other assemblies.
	Low	Remove unreachable managed code to reduce build size and Mono/IL2CPP build times.
	Medium	Run UnityLinker to reduce code size beyond what Low can achieve. You might need to support a custom link.xml file, and some reflection code paths might not behave the same.
	High	UnityLinker will strip as much code as possible. This will further reduce code size beyond what Medium can achieve but managed code debugging of some methods might no longer work. You might need to support a custom link.xml file, and some reflection code paths might not behave the same.
Enable Internal Profiler (Deprecated)	This feature is deprecated and will be retired in a future version of Unity. Use the Profiler window instead (menu: Window > Analytics > Profiler). The Profiler collects application performance data and prints a report to the console. The report contains the number of milliseconds each Unity subsystem takes to execute on each frame, averaged across 30 frames.
Vertex Compression	Sets vertex compression per channel. 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 more information on how to configure vertex compression and limitations of this setting, refer to Compressing mesh data.
Optimize Mesh Data	Enable this option to strip unused vertex attributes from the mesh used in a build. This option reduces the amount of data in the mesh, which can help reduce build size, loading times, and runtime memory usage. Warning: If you have this setting enabled, don’t change material or shader settings at runtime. For more information, refer to PlayerSettings.stripUnusedMeshComponents.
Texture MipMap Stripping	Enables mipmap stripping for all platforms. It 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 hasn’t been stripped.

Stack Trace

Select the logging settings for the WebGL platform.

• Select your preferred stack trace method by enabling the option 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.

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.

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 compression format to use for release build files. The options are: Gzip, Brotli, and Disabled (none). Note that this option doesn’t affect development builds.
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 aren’t affected by this option.
Show Diagnostics Overlay		Enable this option to display an overlay in WebGL builds that displays diagnostics information. It’s available for both Development and Release builds. For more information, see Show Diagnostics Overlay Player settings.
Decompression Fallback		Include decompression fallback code for build files in the loader. Use this option if you are unable to configure server response headers according to the selected compression method.
Initial Memory Size		The initial size of the WASM heap memory in megabytes (MB). By default, this is set to 32 MB. If Memory Growth Mode is set to None, then this is also the maximum size of WASM heap memory.
Memory Growth Mode		Choose the growth mode for the WASM heap memory from the following options. The recommended option is Geometric.
	None	The WASM heap memory has a fixed size configured in Initial Memory Size.
	Linear	The WASM heap memory increases by a fixed amount configured by Linear Memory Growth Step.
	Geometric	The WASM heap memory increases relative to the current heap size depending on the factor configured in Geometric Memory Growth Step and Geometric Memory Growth Cap.
Power Performance		Helps you determine the performance mode that’s ideal for your GPU configuration in a multi-GPU systems environment for WebGL implementation. Select the best GPU configuration for your WebGL build:
	Default	Select Default if you want the WebGL implementation to use its default behavior.
	Low Performance	Select Low Performance if you want the WebGL implementation to prioritize power savings.
	High Performance	Select High Performance, if you want the WebGL implementation to prioritize rendering performance.
Maximum Memory Size		The maximum size of the WASM heap memory in MB. By default, this is set to 2048 MB. This option is only available for the Memory Growth Mode Linear or Geometric.
Linear Memory Growth Step		Advanced tuning option to control the WASM heap growth step in MB. By default, this is set to 16 MB. A growth step of 16MB indicates that the heap is increased by 16MB each time it needs to grow. Only available if Memory Growth Mode is set to Linear.
Geometric Memory Growth Step		Advanced tuning option to control the WASM heap growth factor relative to the current heap size. By default, this is set to 0.2. A growth factor of 0.2 means that the size of the heap is increased by 0.2 * currentHeapSize each time the heap needs to grow. Only available if Memory Growth Mode is set to Geometric.
Geometric Memory Growth Cap		Advanced tuning option to control the upper limit for a heap growth step in MB. By default, this is set to 96 MB. A growth cap of 96MB means that the size of the heap is increased by at most 96 MB. Only available if Memory Growth Mode is set to Geometric.

Show Diagnostic Overlay setting

To help optimize WebGL builds and diagnose potential problems, you can view diagnostics information (currently limited to memory usage) by enabling this setting. Once enabled, an icon appears on the build that displays an overlay with useful data about the build. It’s available for both Development and Release builds.

1. To view the diagnostics information, enable the Show Diagnostics Overlay option in the Player settings window (File > Build Settings > Player Settings > Publishing Settings).

   On desktop, the Diagnostics icon appears on the footer of the WebGL canvas:

   

   On a mobile device, the Diagnostics icon appears on the bottom-right of the screen:

   

2. Click the Diagnostics icon. An overlay appears showing the JavaScript memory, which is further broken down to display WASM heap memory usage:

The following diagnostics appear on the overlay screen:

Property		Function
Total JS Memory		The current size of the JavaScript (JS) heap, including unused memory not allocated to any JS objects in megabytes.
	Used JS Memory	Memory in use by JS objects in megabytes.
Total WASM heap memory		Linear memory representing the entire heap of the C/C++ Unity engine that’s compiled with Emscripten, including unallocated memory in megabytes.
	Used WASM heap	The space of the WASM heap that’s allocated in megabytes.
Page Load Time to First Frame		The total time from the beginning of page load until the first application frame rendering is complete in milliseconds.
	Page Load Time	The time it takes from page load to get to the beginning of rendering the first frame, including downloads, compilation, parsing, and the main application in milliseconds.
	Code download time	The time it takes for the build to download the code file in milliseconds.
	Load time of asset file(.data)	The time it takes for the build to download the .data file binary, in milliseconds.
	WebAssembly startup time	The time it takes between loading the JavaScript framework and reaching Unity’s C++ main(). This is close to compilation time of WASM, in milliseconds.
	Game startup time	The time it takes to finish executing Unity’s C++ main() to the first frame of main, which typically contains the loading of the first game sceneA 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 See in Glossary in milliseconds.
Average FPSSee first person shooter, frames per second. See in Glossary (10 seconds)		The average of last 10 frames per secondThe frequency at which consecutive frames are displayed in a running game. More info See in Glossary.
	Current frames per second	The number of frames rendered on screen per second.
Number of Frame Stalls		The number of rendered frames that took unusually long to complete compared to their previous frames.

Important note about JS Memory

The JS Memory information is obtained using the performance.memory API, which is currently only supported on Chrome or Edge. There are no other APIs available that return this information for Safari or Firefox.

Note: The performance.memory API isn’t supported on iOS devices.

On browsers where this API isn’t supported, a message showing N/A appears.

Additional resources:

• Texture Compression in WebGL
• Using WebGL Templates
• Splash Screen
• Texture compression format overview
• Texture compression format override

PlayerSettingsWebGL