# Reduce APK size

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> The code on this page works with either the **default UI** or the **custom UI**.

Since our SDK contains NDK code, it must be built individually for all
CPU architectures to satisfy each ABI type. As a result, adding the SDK
to your project may have the unintended consequence of drastically
increasing your APK size. Here are a couple of steps you can take to
mitigate a significant portion of this increase.

## Applying ABI filters

If you know that you will not need to support certain CPU types,
filter them out in your app's `build.gradle` file. To do so, add
this block within `defaultConfig`.

```groovy
ndk {
  abiFilters 'x86', 'x86_64' // Do not build for x86 & x86_64 CPUs
}
```

Doing this for all CPU architectures you do not wish to support can
greatly reduce the size of the SDK's files.

## Do not extract native libraries

Another step you can take to reduce the size of the SDK is to set the
following attribute in your `AndroidManifest.xml`.

```xml
<application
  extractNativeLibs='false'
```

See [Avoid extracting native
libraries](https://developer.android.com/topic/performance/reduce-apk-size#extract-false)
in the Android Developers documentation for details.

## Additional resources

See [Reduce your app
size](https://developer.android.com/topic/performance/reduce-apk-size)
in the Android Developers documentation for more tips.