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Online Java Decompiler APK: Learn How to Extract and Inspect Android Code

Online Java Decompiler APK: What Is It and How to Use It?

If you are an Android developer or user, you might have encountered APK files, which are the package files used to distribute and install Android apps. But have you ever wondered what is inside an APK file, or how to access the source code of an Android app? This is where an online Java decompiler APK comes in handy.

online java decompiler apk


An online Java decompiler APK is a tool that allows you to extract the contents of an APK file and decompile the Java bytecode into readable source code. This can help you to debug, analyze, modify, or learn from Android apps without having to install any software on your computer or device.

In this article, we will explain what an APK file is, what a Java decompiler is, what an online Java decompiler APK is, how to use it, and provide some examples of online Java decompiler APK websites. We will also answer some frequently asked questions about online Java decompiler APKs.

What Is an APK File?

An APK file stands for Android Package Kit, also known as Android Application Package or just Android Package. It is the file format used by the Android operating system, and a number of other Android-based operating systems, for distribution and installation of mobile apps, mobile games, and middleware. A file using this format can be built from source code written in either Java or Kotlin.


APK files are packaged as compressed in ZIP file format that can be opened with any ZIP file opening software. The .apk extension of such a file can be renamed to .zip and open the file in any ZIP application or extract its contents.

An APK file contains all of a program's code (such as .dex files), resources, assets, certificates, and manifest file. As is the case with many file formats, APK files can have any name needed, but it may be required that the file name ends in the file extension for being recognized as such.

Some of the content found in a typical APK file includes:

  • An AndroidManifest.xml file that defines the app's name, version, permissions, activities, services, etc.

  • A classes.dex file that contains the compiled Java bytecode of the app.

  • A resources.arsc file that contains precompiled resources such as strings, images, layouts, etc.

  • A META-INF folder that contains the app's signature and certificate information.

  • A res folder that contains the app's resources that are not compiled into resources.arsc.

  • An assets folder that contains any additional files that the app needs to access as raw data.

  • A lib folder that contains any native libraries that the app uses.

What Is a What Is a Java Decompiler?

A Java decompiler is a tool that can reverse engineer Java bytecode into source code. Java bytecode is the intermediate representation of Java code that is executed by the Java Virtual Machine (JVM). Java source code is the human-readable code that is written by programmers using a text editor or an integrated development environment (IDE).

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A Java decompiler can help programmers to debug, analyze, modify, or learn from Java applications without having access to the original source code. For example, a Java decompiler can be used to:

  • Recover lost or corrupted source code from compiled classes.

  • Understand how a third-party library or framework works.

  • Find and fix bugs or vulnerabilities in an app.

  • Enhance or customize the functionality of an app.

  • Learn from the best practices or coding styles of other developers.


There are different types of Java decompilers, depending on the level of abstraction, accuracy, and completeness of the output. Some of the common types are:

  • Bytecode decompilers: These are the simplest and fastest type of decompilers, which only translate the bytecode instructions into equivalent Java statements, without restoring the original variable names, comments, or formatting. They are useful for quick and dirty analysis, but not for producing readable or maintainable code.

  • Source code decompilers: These are the most advanced and sophisticated type of decompilers, which attempt to reconstruct the original source code as closely as possible, by inferring the variable names, types, modifiers, control structures, expressions, and comments from the bytecode. They are useful for producing high-quality code that can be edited or compiled again.

  • Intermediate code decompilers: These are the middle ground between bytecode and source code decompilers, which produce a higher-level representation of the bytecode than simple instructions, but not as high-level as source code. They are useful for understanding the logic and structure of the code, but not for modifying or compiling it.

What Is an Online Java Decompiler APK?

An online Java decompiler APK is a web-based tool that combines the functions of an APK extractor and a Java decompiler. It allows you to upload an APK file from your computer or device, and then choose a Java decompiler to convert the classes.dex file inside the APK into source code. You can then download the source code as a ZIP file or view it online in your browser.


Using an online Java decompiler APK has several benefits over using a standalone APK extractor or Java decompiler software, such as:

  • Convenience: You don't need to install any software on your computer or device, or worry about compatibility issues. You can use any web browser and any operating system to access the online tool.

  • Speed: You don't need to extract the APK file manually or run the Java decompiler locally. The online tool can process the APK file and generate the source code in a matter of seconds.

  • Compatibility: You don't need to worry about finding a suitable Java decompiler for your APK file. The online tool can support various versions of Android and various types of Java decompilers.

How to Use an Online Java Decompiler APK?

Using an online Java decompiler APK is very easy and straightforward. Here are the steps to follow:

  • Find an online Java decompiler APK website that suits your needs. There are many websites that offer this service, such as , etc.

  • Select or drag and drop your APK file from your computer or device to upload it to the website. The file size limit may vary depending on the website.

  • Choose a Java decompiler from the available options. Some websites may offer more than one option, such as , etc.

  • Wait for the website to extract the APK file and decompile the classes.dex file into source code. This may take a few seconds or minutes depending on the file size and complexity.

  • Download the source code as a ZIP file or view it online in your browser. You can browse You can browse the source code by folders and files, and view the code syntax highlighted and formatted. You can also search for keywords or classes in the code.


Here are some examples of online Java decompiler APK websites and their features and screenshots:




- Supports APK files up to 100 MB- Supports Procyon, CFR, and Fernflower decompilers- Supports Android 5.0 to 11.0 versions- Provides a ZIP download link and an online code viewer

- Supports APK files up to 50 MB- Supports Jadx decompiler, which is fast and accurate- Supports Android 4.0 to 11.0 versions- Provides a ZIP download link and an online code viewer with a tree view

- Support


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