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Find the ShaderVariantCollection and GraphicsStateCollection in the project and exclude unregistered variants from the build. You can change the behaiour in the settings window ( "UTJ/ShaderVariantStrip" ).

If you are using Unity 2022 or earlier

Please use version 2.

about Setting Window

CommonTab

Enable Stripping

Set to perform strip processing or not.

Log Variants

Specify whether to log which variants are included and which are excluded during the build process. Specify whether you want to keep a log of which variants were included and which were excluded.
It will be written to the directory "ShaderVariants/Builds/Timestamps" under the project.
This can be done even if Stripping is disabled.

「Reset Timestamp」Button

There was a possibility that the log timestamp was not reset properly when building consecutively.
If you find that the log timestamps are not updated properly during continuous build, please press this button.

Strict Variant Stripping

When enabled, Shaders that are not in the ShaderVariantCollection/GraphicsStateCollection will be deleted all Variants. When disabled, shaders that are not in the ShaderVariantCollection/GraphicsStateCollection is not performed by any special strip processing.

SafeMode

If all variants in Pass are deleted, at least one variant will be retained. If Pass becomes empty, Fallback will not be triggered and drawing will be skipped, so we have provided an option for this case.

Disable Unity Stripping

Enabling this feature will remove the IPreprocessShaders under the "Unity." or "UnityEngine.".( such as Universal RenderPipeline. )
If Strict Variant Stripping is not enabled, you cannot use this feature. *It's implemented by rewriting IL code.

[Debug]List ShaderKeywords

You can debug which Shader keywords are enabled at which Stage.

ShaderVariantCollection Tab

Use ShaderVariantCollection

If disabled, ShaderVariantCollection within the project will be ignored.

Exclude Stripping Rule

The ShaderVariantCollection asset specified here will be ignored.

GraphicsStateCollection Tab

UseGraphicsStateCollection

If disabled, GraphicsStateCollection within the project will be ignored.

Match Graphis API Only

Only consider GraphicsStateCollections created with the same Graphics API as the build target.

Match Target Platfomr Only

Only consider GraphicsStateCollection created on the same platform as the build target.

Exclude Stripping Rule

The GraphicsStateCollection assets specified here will be excluded and ignored.

Connect Runtime Tab

This option collects mismatched ShaderVariants from DevelopmentBuild with “Strict shader variant matching” enabled in PlayerSettings and creates a dummy GraphicsStateCollection.

TargetPlayer

Connect to the target for DevelopmentBuild.

Create GraphicsStatesCollection from Miss Match Variant

Press this button to generate GraphicsStateCollection under Assets/GraphicsStateCollection/MissMatchVarint.

Recieve GraphicsStateCollection from Player

To display this button, you need to add “STRIP_ENABLE_AUTO_GSC” to Define. <br/ > When the button is pressed, the GraphicsStateCollection that has been traced since the connected Player started up is transferred to the Editor.

GraphicsStateCollection cannot trace multiple objects simultaneously, so we have introduced options using Define.

Reference：

About Strip Processing

This uses the removal of scriptable shader variants.
https://blogs.unity3d.com/jp/2018/05/14/stripping-scriptable-shader-variants/

When Strip Processing Is Not Performed

In incremental builds, IPreprocessShaders.OnPorocessShader may not be called.
https://docs.unity3d.com/6000.0/Documentation/Manual/incremental-build-pipeline.html

If this occurs, please try CleanBuild.

Proposed workflow

This is a proposal for building a GraphicsStateCollection to improve strip processing.

1. First, disable Strip in this tool, create a Development build with “STRIP_ENABLE_AUTO_GSC” defined.
2. After running for a while, retrieve the GraphicsStateCollection from the Player.
3. Then, enable PlayerSettings.strictShaderVariantMatching, enable this tool, enable StrictVariantStripping and SafeMode in Common settings, and create a Development Build.
4. Collect Shader Variant mismatches using “Create GraphicsStatesCollection from Miss Match Variant.”

I recommend collecting and building the GraphicsStateCollection in this manner.
For the final build, enable SafeMode/StrictVarinatStripping in this tool and disable "PlayerSettings.StrictVariantStripping" for safety considerations.

※Enabling StrictVarinatStripping reduces the memory usage of unused shaders, such as fallback shaders.