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How to Decompile Android APK Online and View the Source Code


Online APK Decompiler: How to Extract and View Android App Source Code




If you are an Android developer or enthusiast, you may have wondered how to access the source code and resources of an Android app. Maybe you want to learn how a popular app works, modify an app for your own purposes, or reverse engineer an app for security or ethical reasons. Whatever your motivation, you need a tool that can help you decompile an Android app package (APK) file into readable Java code. That's where an online APK decompiler comes in handy.


In this article, we will explain what an APK file is and why you would want to decompile it. We will also show you how an online APK decompiler works and what are its benefits and limitations. Finally, we will give you some tips on how to choose the best online APK decompiler for your needs.




online apk decompiler



What is an APK file and why would you want to decompile it?




An APK file is the package format for Android apps




An APK file is a compressed archive that contains all the files and resources that make up an Android app. It includes:



  • The compiled Java code in Dalvik Executable (DEX) format



  • The manifest file that describes the app's permissions, features, and components



  • The resources file that contains the app's images, icons, sounds, layouts, etc.



  • The signature file that verifies the app's authenticity



  • The metadata file that provides information about the app's version, name, etc.



An APK file is essentially a ZIP file with a different extension. You can open it with any ZIP utility or rename it to .zip and extract it with any file manager. However, opening an APK file does not reveal much about the app's functionality or logic. To do that, you need to decompile it.


Decompiling an APK file can help you learn, modify, or reverse engineer an app




Decompiling an APK file means converting the DEX code back into Java code that is more human-readable and understandable. Decompiling an APK file can help you with various purposes, such as:



  • Learning how a successful app is designed and developed



  • Modifying an app to add new features, fix bugs, or change its appearance



  • Reverse engineering an app to analyze its behavior, security, or performance



  • Extracting the resources or assets of an app for reuse or modification



  • Translating or localizing an app to a different language or region



Decompiling an APK file can also help you protect your own app from being decompiled by others. By understanding how decompilation works, you can apply techniques such as obfuscation, encryption, or code protection to make your app more resistant to decompilation.


What is an online APK decompiler and how does it work?




An online APK decompiler is a web-based tool that converts an APK file into readable Java code




An online APK decompiler is a tool that allows you to decompile an APK file without installing any software on your computer. All you need is a web browser and an internet connection. An online APK decompiler can save you time and hassle by doing the decompilation process for you.


An online APK decompiler works by uploading your APK file to a server, where it is processed by a decompiler engine. A decompiler engine is a program that analyzes the DEX code and converts it into Java code. There are different types of decompiler engines, such as Jadx, apktool, dex2jar, etc. Each decompiler engine has its own advantages and disadvantages, depending on the complexity and features of the APK file.


The main steps of online APK decompilation are:




Upload the APK file to the online decompiler website




The first step is to find an online APK decompiler website that supports your APK file format and features. You can search for "online apk decompiler" on Bing or any other search engine to find a list of websites that offer this service. Some examples are:















Once you have chosen a website, you need to upload your APK file to it. You can either drag and drop your file or browse your computer to select it. The maximum file size may vary depending on the website, but it is usually around 50 MB.


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Choose a decompiler engine (e.g., Jadx, apktool, etc.)




The next step is to choose a decompiler engine that will process your APK file. Some websites may offer you multiple options, while others may use a default one. You can compare the features and limitations of different decompiler engines on their respective websites or documentation pages.


Some of the most popular and widely used decompiler engines are:



  • Jadx: A fast and lightweight decompiler that produces high-quality Java code with comments and variable names. It supports most Android features and formats, such as .apk, .dex, .xapk, .arsc, etc. It also has a graphical user interface (GUI) version that you can download and use offline.



  • Apktool: A powerful and versatile decompiler that can handle complex APK files with multiple resources and configurations. It can decode and rebuild the manifest file, the resources file, and the DEX code. It also supports .xapk files and custom frameworks.



  • Dex2jar: A simple and fast decompiler that converts DEX code into Java Archive (JAR) files that can be opened with any Java decompiler (e.g., JD-GUI, Procyon, etc.). It does not decode or rebuild the manifest file or the resources file.



You can choose the best decompiler engine for your needs based on the type and complexity of your APK file and the quality and accuracy of the output code.


Download or view the decompiled source code and resources




The final step is to download or view the result of the online APK decompilation. Depending on the website and the decompiler engine, you may get different formats and options for the output files.


Some websites may give you a ZIP file containing all the source code and resources of your APK file. You can unzip the file and explore the contents with any text editor or IDE. Some websites may also let you view the source code and resources online, either in a tree view or a code editor. You can browse, search, or edit the files online, but you may not be able to download them individually.


The output files may include:



  • The Java source code files (.java) that correspond to the DEX code of your APK file. These files may be organized in packages or folders according to the app's structure.



  • The manifest file (AndroidManifest.xml) that contains the app's metadata, permissions, features, and components. This file may be decoded into XML format or rebuilt into binary format.



  • The resources file (resources.arsc) that contains the app's images, icons, sounds, layouts, etc. This file may be decoded into XML format or rebuilt into binary format.



  • The assets folder that contains any additional files or resources that are not compiled into the APK file, such as fonts, databases, etc.



  • The original signature file (META-INF) that verifies the app's authenticity. This file may not be modified or rebuilt by the online decompiler.



You can use the output files to learn, modify, or reverse engineer the app as you wish. However, you should be aware of the legal and ethical implications of decompiling an APK file without the permission of the app's owner or developer. You should respect the intellectual property rights and privacy of the app's creator and users.


What are the benefits and limitations of online APK decompile


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