# How to Convert .AAB to .APK on Windows and macOS

---

## Introduction

When using Expo’s **EAS Build**, the output is an `.aab` (Android App Bundle) instead of an `.apk`. However, `.apk` files are often needed for local testing and sharing. In this guide, we’ll walk through how to convert `.aab` to `.apk` using simple commands on **Windows** and **macOS**.

## Prerequisites

* **Java Development Kit (JDK)** installed (for `bundletool.jar`).
    
* The `.aab` file generated from **Expo EAS Build**.
    
* **Android SDK (adb)** installed for testing.
    

## Step 1: Download `bundletool.jar`

Download Google's official **BundleTool**:  
[👉 Download bundletool.jar](https://github.com/google/bundletool/releases/latest)

Save it to an accessible location, e.g., **Downloads**.

## Step 2: Generate the APK from .AAB

Run the following command:

```bash
java -jar bundletool.jar build-apks --bundle=myapp.aab --output=myapp.apks --mode=universal
```

This creates a `.apks` archive containing the `.apk` file.

## Step 3: Extract the APK

Rename the `.apks` file to `.zip` and extract it. You’ll find your `.apk` inside the `universal` folder.

Alternatively, extract it via command line:

```bash
unzip myapp.apks -d myapp_apks
```

Find the APK at:

```bash
myapp_apks/universal.apk
```

## Step 4: Install the APK on Your Device

To install the APK, connect your Android device via USB and run:

```bash
adb install myapp_apks/universal.apk
```

## Conclusion

You’ve successfully converted an .aab to an .apk for testing! 🎉