React Native App Size Reduction Strategies
1 ) Remove Unused Assets and Code
Identify and eliminate dead images, fonts, and code using tools like react native unused or depcheck.
Conduct manual audits or employ asset optimization tools to avoid bundling unnecessary resources.
This reduces asset clutter and significantly decreases app size.
2 ) Enable Proguard for Android
Configure Proguard in `android/app/build.gradle` by enabling `minifyEnabled` and `shrinkResources`.
Use Proguard rules carefully to shrink, optimize, and obfuscate Java bytecode.
This reduces Android build sizes by approximately 10 20%.
3 ) Enable Hermes JavaScript Engine
Activate Hermes in the Android and iOS build settings (`android/app/build.gradle` and `Podfile`).
Hermes replaces the default JavaScriptCore engine with a lightweight, optimized engine.
This leads to a 15 25% reduction in the JavaScript bundle size and improves runtime performance.
4 ) Optimize Image Assets
Compress images and convert formats to more efficient ones like WebP using libraries such as react native image resizer and tools like TinyPNG or ImageOptim.
This step can reduce app size by several megabytes by lowering image payloads.
5 ) Remove Heavy or Unused Libraries
Audit dependencies and trim down libraries that are excessive or poorly scoped for your app’s needs.
Replace heavy UI kits with lightweight alternatives and exclude development only tools (e.g., Reactotron) from production builds.
Reducing dependencies lowers overall bundle and binary size.
6 ) Split APKs for Android
Use ABI splits in `android/app/build.gradle` to generate separate APKs for different device architectures instead of one universal APK.
This ensures users download only what their device requires, reducing install size.
7 ) Use Android App Bundles (.aab)
Switch from traditional APK packaging to `.aab` format, allowing Google Play to deliver optimized APKs based on device configurations.
This significantly reduces download and install sizes for end users.
8 ) Enable Dead Code Elimination (DCE)
Configure Metro bundler in `metro.config.js` to use inline requires enabling Deferred Module Loading, which removes unused code during bundling.
This leads to reduced bundle sizes and faster app startup times.
9 ) Strip Debug Logs and Dev Tools for Production
Remove console logs and debugging tools using Babel plugins like `babel plugin transform remove console`.
Disable tools such as Flipper and Reactotron in production builds to avoid unnecessary bundle bloat.
Conclusion
Implementing these strategies can reduce React Native app size by over 60%, improving download times, storage consumption, and user experience without sacrificing functionality. Enabling Hermes, Proguard, optimizing assets, removing unused code and libraries, and leveraging Android App Bundles are key steps to achieve a lightweight and performant React Native app.
https://justacademy.in/news-detail/android-updates-for-foldable-phones
https://justacademy.in/news-detail/react-native?s-latest-security-updates-keep-apps-safer-than-ever
https://justacademy.in/news-detail/flutter-test-lab-new-features
https://justacademy.in/news-detail/new-android-widgets-trends
https://justacademy.in/news-detail/the-react-native-community?s-most-popular-plugins-in-2025
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