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Apktool 2023: A Powerful Tool for Android App Development and Analysis

Apktool 2023: A Comprehensive Guide

If you are an Android developer, enthusiast, or hacker, you might have heard of Apktool. It is a powerful tool that allows you to reverse engineer Android applications, modify them, and rebuild them. In this article, we will explain what Apktool is, why you should use it, how to install it, how to use it, how to customize it, and how to troubleshoot it. By the end of this article, you will have a solid understanding of Apktool and how to use it for your own purposes.

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What is Apktool?

Apktool is a tool for reverse engineering Android applications. It can decode resources to nearly original form and rebuild them after making some modifications. It also makes working with an app easier because of the project like file structure and automation of some repetitive tasks like building apk, etc. It is NOT intended for piracy and other non-legal uses. It could be used for localizing, adding some features or support for custom platforms, analyzing applications and much more.

Why use Apktool?

There are many reasons why you might want to use Apktool. Here are some of them:

  • You want to learn how an app works by looking at its source code and resources.

  • You want to modify an app to suit your needs or preferences.

  • You want to add new features or functionality to an app.

  • You want to remove unwanted features or ads from an app.

  • You want to fix bugs or errors in an app.

  • You want to translate an app into another language or customize its appearance.

  • You want to test the security or performance of an app.

  • You want to create your own app based on an existing one.

Of course, these are just some examples of what you can do with Apktool. The possibilities are endless, as long as you have the skills and creativity to do so.

How to Install Apktool 2023


Before you can install and use Apktool, you need to have some prerequisites on your system. These are:

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  • A Windows, Linux, or Mac OS computer.

  • A Java Runtime Environment (JRE) version 8 or higher.

  • An Android SDK (Software Development Kit) with adb (Android Debug Bridge) and aapt (Android Asset Packaging Tool).

  • A valid keystore file for signing APK files (optional).

Downloading Apktool

The latest version of Apktool is available on its official website or on its GitHub repository. You can download it as a zip file or a jar file. The zip file contains the jar file and some additional files such as the properties file and the framework resources. The jar file is a standalone executable that can run on any system with Java installed.

Installing Apktool

The installation process of Apktool depends on whether you downloaded the zip file or the jar file. Here are the steps for each option:

If you downloaded the zip file:

  • Extract the zip file to a folder of your choice.

  • Add the folder path to your system's PATH environment variable. This will allow you to run Apktool from any location on your system.

If you want to specify a different output file name, you can use the -o option or append the file name after the project folder name. For example, if you want to rebuild the app to a file named new_app.apk, you can type:

apktool b my_app -o new_app.apk

apktool b my_app new_app.apk

If you want to rebuild the app with the same package id as the original app, you can use the -m option. This is useful if you want to update an existing app without uninstalling it first. For example, if you want to rebuild the app with the same package id, you can type:

apktool b my_app -m

Signing APK Files

To install and run an APK file on your device or emulator, you need to sign it with a valid keystore file. Apktool does not sign the APK files by itself, so you need to use another tool for this purpose. One of the most common tools for signing APK files is jarsigner, which is part of the Java Development Kit (JDK). You can also use other tools such as apksigner or signapk.

To sign an APK file with jarsigner, you need to have a keystore file and a key alias. A keystore file is a file that contains one or more private keys and their corresponding public key certificates. A key alias is a name that identifies a specific key in the keystore file. You can create a keystore file and a key alias using the keytool command, which is also part of the JDK.

To sign an APK file with jarsigner, you need to use the following syntax:

jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore <keystore_file> <apk_file> <key_alias>

The options are as follows:

  • -verbose: Prints detailed information about the signing process.

  • -sigalg SHA1withRSA: Specifies the signature algorithm to use.

  • -digestalg SHA1: Specifies the digest algorithm to use.

  • -keystore <keystore_file>: Specifies the path to the keystore file.

  • <apk_file>: Specifies the path to the APK file.

  • <key_alias>: Specifies the name of the key alias.

For example, if you have a keystore file named my_keystore.jks, a key alias named my_key, and an APK file named new_app.apk, you can sign it by typing:

jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my_keystore.jks new_app.apk my_key

You will be prompted to enter the password for the keystore file and the key alias. After entering them, jarsigner will sign the APK file and print some information about it.

How to Customize Apktool 2023

Editing the Properties File

Apktool has a properties file named that contains some configuration options for Apktool. You can edit this file to change some settings such as:

  • aaptPath: The path to aapt.

  • useAapt2: Whether to use aapt2 or not.

  • useBruteforce: Whether to use bruteforce mode or not.

  • keepBrokenResources: Whether to keep broken resources or not.

  • androidFramework: The path to android.jar.

  • frameworkFolder: The path to framework resources folder.

  • forceDeleteFramework: Whether to force delete framework resources or not.

  • useFrameworkSymlinks: Whether to use framework symlinks or not.

  • baksmaliDebugMode: Whether to enable smali debugging mode or not.

  • baksmaliApiLevel: The API level for smali decoding.

  • baksmaliJobs: The number of threads for smali decoding.

  • smaliDebugMode: Whether to enable smali debugging mode or not.

  • smaliApiLevel: The API level for smali encoding.

  • smaliJobs: The number of threads for smali encoding.

You can find the properties file in the same folder as the jar file or in the /.local/share/apktool folder on Linux and Mac OS or in the %USERPROFILE%\AppData\Local\apktool folder on Windows. You can edit this file with any text editor of your choice.

Changing the Framework Resources

Apktool uses a set of framework resources to decode and rebuild APK files. These resources are stored in a folder named 1.apk by default. You can change these resources by using the -p option when decoding or rebuilding APK files. For example, if you have a different set of framework resources in a folder named 2.apk, you can use it by typing:

apktool d -p 2.apk app.apk

apktool b -p 2.apk my_app

You can also use multiple framework resources by separating them with commas. For example, if you


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