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Anisim Lukin
Anisim Lukin

Decompile APK Online: A Simple and Fast Way to View Android App Code


What is an APK file and why decompile it?




An APK file is an app created for Android, Google's mobile operating system. It is a package file format that contains all the elements that an app needs to install and run on your device, such as code, resources, manifest, certificates, etc. You can download APK files from Google Play Store or other sources, and install them on your device manually or automatically.


Sometimes, you may want to decompile an APK file, which means to extract and view its contents, such as source code, resources, manifest, etc. There are various reasons why you may want to decompile an APK file, such as:




how to decompile apk online


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  • To understand how an app works or what it does



  • To modify the app for personal use or customization



  • To reverse engineer the app to create a similar or better one



  • To learn from the app's code or design



  • To debug or test the app



  • To remove ads or malware from the app



However, decompiling an APK file is not always easy or legal. Some apps may use encryption, obfuscation, or anti-debugging techniques to prevent or complicate decompilation. Also, some apps may have intellectual property rights or licenses that prohibit decompilation or modification. Therefore, you should always respect the app's developer and owner, and only decompile an APK file for legitimate purposes.


How to decompile an APK file online using JADX




JADX is one of the best online tools for decompiling APK files. It is a free and open-source tool that can decompile Android Dex and APK files into Java source code. It also has a graphical user interface that allows you to browse and analyze the decompiled code online.


To use JADX online, you need to follow these steps:


  • Go to and click on "Upload and Decompile" button.



  • Select the APK file that you want to decompile from your computer or drag and drop it into the upload area.



  • Wait for the upload and decompilation process to finish. It may take some time depending on the size and complexity of the APK file.



  • Once done, you will see the list of classes and resources that were extracted from the APK file. You can click on any class or resource to view its content in a new tab.



  • You can also search for any keyword or symbol in the decompiled code using the search box at the top right corner.



  • You can download the entire decompiled code as a ZIP file by clicking on the "Download" button at the top left corner.



How to recompile an APK file online using Apktool




Apktool is another online tool that can help you recompile an APK file after modifying it. It is a tool for reverse engineering Android apk files. It can decode resources to nearly original form and rebuild them after making some modifications.


To use Apktool online, you need to follow these steps:


  • Go to and click on "Upload" button.



  • Select the modified ZIP file that contains the decompiled code from your computer or drag and drop it into the upload area.



  • Wait for the upload and recompilation process to finish. It may take some time depending on the size and complexity of the ZIP file.



  • Once done, you will see a message saying "Rebuild complete". You can download the recompiled APK file by clicking on the "Download" button below.



How to protect your APK file from decompilation using Proguard




Proguard is a tool that can help you Proguard is a tool that can help you protect your APK file from decompilation by shrinking, obfuscating, and optimizing your code. It is a part of the Android Gradle plugin and works with R8 to perform these tasks. Proguard can reduce the size of your app, make it faster, and make it harder for reverse engineers to understand your code.


To use Proguard for your app, you need to follow these steps:


  • Enable shrinking, obfuscation, and optimization in your app's build.gradle file by setting minifyEnabled to true in the release build type. For example:



android buildTypes release minifyEnabled true proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'


  • Choose a default Proguard rules file that suits your app's needs. There are two options: proguard-android.txt, which only shrinks your code, and proguard-android-optimize.txt, which also optimizes and obfuscates your code. You can specify the default Proguard rules file using the getDefaultProguardFile() method in your build.gradle file, as shown above.



  • Create a custom Proguard rules file that contains any additional rules or exceptions for your app. You can name this file anything you want, but a common name is proguard-rules.pro. You can specify the custom Proguard rules file using the proguardFiles property in your build.gradle file, as shown above.



  • Add any rules or exceptions that are specific to your app or its dependencies in the custom Proguard rules file. For example, you may need to keep some classes or methods that are accessed by reflection or native code, or you may need to apply some annotations or flags to prevent certain optimizations. You can find more information about how to write Proguard rules in the .



Once you have configured Proguard for your app, you can build and test your release APK file to make sure everything works as expected. You can also use tools like to inspect the contents of your APK file and see how Proguard has affected it.


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Conclusion




In this article, we have learned how to decompile and recompile APK files online using JADX and Apktool, as well as how to protect our APK files from decompilation using Proguard. Decompiling APK files can be useful for learning, debugging, or modifying apps, but we should always respect the intellectual property rights and licenses of the app developers and owners. Recompiling APK files can help us create modified or customized versions of apps, but we should always test them thoroughly before using them. Protecting APK files from decompilation can help us reduce the size, improve the performance, and increase the security of our apps, but we should always follow the best practices and guidelines for using Proguard.


FAQs




Q: What is the difference between decompiling and disassembling an APK file?




A: Decompiling an APK file means converting its bytecode into a high-level programming language, such as Java or Kotlin. Disassembling an APK file means converting its bytecode into a low-level assembly language, such as Dalvik bytecode or Smali.


Q: Can I decompile any APK file online?




A: No, some APK files may be encrypted, obfuscated, or protected by anti-decompilation techniques that make them impossible or very difficult to decompile online. You may need to use more advanced tools or methods to decompile such APK files.


Q: Can I recompile any modified APK file online?




A: No, some modifications may break the functionality or integrity of the APK file and make it impossible or very difficult to recompile online. You may need to use more advanced tools or methods to recompile such APK files.


Q: Can I protect my APK file from decompilation completely?




A: No, there is no foolproof way to prevent decompilation of any APK file. However, you can use tools like Proguard to make decompilation harder and less useful for reverse en


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