Unity Build Size Too Large? Fix in 3 Steps | Unity Tutorial for Beginners (2025)
Meta Description:
Learn how to fix the “Unity build size too large” problem in just 3 simple steps! This 2025 Unity tutorial for beginners covers Android, iOS, and WebGL optimization techniques — reduce file size, speed up builds, and boost game performance.
🎮 Introduction
If you’ve ever built a Unity project and got shocked by the huge build size, you’re not alone.
Many beginners face this issue — especially when exporting to Android (APK/AAB), iOS, or WebGL.
The good news?
You can shrink your build size drastically by tweaking just a few settings.
In this guide, you’ll learn 3 simple steps to fix Unity’s large build size problem — tested and updated for Unity 2025.
🧩 Step 1: Remove Unused Assets and Optimize Textures
Large build sizes often come from unused assets or uncompressed textures.
✅ What to do:
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Delete any unused scenes, models, or prefabs from your Assets folder.
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In Project Settings → Player → Other Settings, disable “Auto Graphics API” and manually select only what you need (e.g., OpenGLES3 for Android).
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Reduce texture sizes:
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Go to each large texture.
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In the Inspector, lower the Max Size (e.g., 4096 → 1024).
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Change Compression to “Normal Quality” or “High Quality” (based on need).
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💡 Pro Tip:
Use the Build Report Tool (available free on Unity Asset Store) to identify which assets are consuming the most space.
⚙️ Step 2: Adjust Player Settings and Build Options
Unity’s Player Settings have a massive impact on build size.
For Android:
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Build System: Gradle
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Scripting Backend: IL2CPP
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Target Architectures: Select only ARM64 (uncheck ARMv7)
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Compress Assets: Use “LZ4HC” compression
For iOS:
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Use IL2CPP backend only
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Avoid unnecessary iOS frameworks/plugins
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Set Strip Engine Code to true
For WebGL:
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Go to Player → Publishing Settings
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Set Compression Format to “Gzip” or “Brotli”
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Enable Data Caching
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Disable Exceptions (set to None)
🧠 Step 3: Enable Code Stripping & Managed Stripping Level
Unity includes code for all possible features — even the ones you don’t use.
This can bloat your build unnecessarily.
✅ How to fix:
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Go to Project Settings → Player → Other Settings
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Under Optimization:
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Enable Strip Engine Code
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Set Managed Stripping Level to “High”
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Enable **IL2CPP Code Generation: Faster (smaller) builds”
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⚡ Bonus Tip:
Remove unused packages from Package Manager (e.g., Analytics, XR, or Ads if not needed).
📉 Bonus: Use Addressables for Large Assets
If your game includes lots of audio, textures, or prefabs — use Unity Addressables.
It lets you load assets on demand instead of packing everything into one big file.
This is especially useful for mobile and WebGL projects.
✅ Final Results
By following these 3 steps, you can reduce your build size by 40–70% depending on your project.
Your builds will:
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Upload faster
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Install quicker
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Perform better
📦 Summary
| Step | Action | Benefit |
|---|---|---|
| 1 | Optimize textures & remove unused assets | Saves space immediately |
| 2 | Adjust build settings | Targets only required platforms |
| 3 | Enable stripping | Removes unused engine code |
🏁 Conclusion
Fixing large Unity build sizes isn’t hard — it’s about knowing where the hidden bloat comes from.
By cleaning up assets, optimizing settings, and stripping unused code, you’ll create smaller, faster, and more professional builds.
Whether you’re exporting for Android, iOS, or WebGL, these 3 steps will keep your projects lightweight and ready for release.
✨ Keywords / Tags:
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