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Rajen Trivedi
Rajen Trivedi

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How to Generate APK from AAB File Using Bundletool (Super Simple Guide)

#android #apk #aab #bundletool

Hey devs! πŸ‘‹

We all know Google Play now prefers Android App Bundles (AAB) for publishing because they generate optimized APKs for each device.

But in real-world development, we often need a single APK for:

  • Testing on physical devices
  • Sharing with QA teams
  • Quick installs without Play Store

Here is the easiest and official way to convert your .aab file into an .apk using Google’s Bundletool.

πŸ› οΈ Step 1: Download Bundletool

  1. Go to the official GitHub releases:
    πŸ‘‰ https://github.com/google/bundletool/releases/latest

  2. Download the latest file:

   bundletool-all-x.x.x.jar
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  1. Place the .jar file:
  • In the same folder as your .aab file OR
  • Remember its full path

βš™οΈ Step 2: Generate .apks File (Universal Mode)

Open Command Prompt (Windows) or Terminal (Mac/Linux) and run:

java -jar bundletool-all-1.18.3.jar build-apks --bundle=app-release.aab --output=myapp.apks --mode=universal
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πŸ” Replace:

  • bundletool-all-1.18.3.jar β†’ your actual jar filename
  • app-release.aab β†’ your AAB file path/name

πŸ“¦ Output:

myapp.apks
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By default, this is signed with a debug keystore.

πŸ“¦ Step 3: Extract the APK

  1. Rename the file: 
   ren myapp.apks myapp.zip
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  1. Extract it using:
  • WinRAR
  • 7-Zip
  • Default OS extractor
  1. Inside, you’ll find: 
   universal.apk
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πŸŽ‰ That’s your final APK!

You can rename it:

app-release.apk
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πŸ” Generate Signed APK (Recommended for QA)

If you want a release-signed APK, use your keystore:

java -jar bundletool-all-1.18.3.jar build-apks \
  --bundle=app-release.aab \
  --output=myapp.apks \
  --mode=universal \
  --ks=your-keystore.jks \
  --ks-key-alias=your_alias \
  --ks-pass=pass:your_keystore_password \
  --key-pass=pass:your_key_password
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🧠 Common Tips & Troubleshooting

  • βœ… Check Java installation: 
  java -version
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  • πŸ“ Keep files in the same folder to avoid path issues

  • πŸ“¦ Universal APK is larger (contains all device configs)

  • 🚫 Not for Play Store β€” upload AAB only

  • ❌ Error: Unable to access jarfile

    • Check filename and path carefully

🏁 Conclusion

That’s it! 🎯

In less than 2 minutes, you can convert any .aab into an .apk using Bundletool β€” no GUI tools needed.

If you run into any issues, drop the error in the comments β€” happy to help! 😊

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