JD-GUI Java-Decompiler

JD-GUI Java-Decompiler

JD-GUI is a graphical utility that allows developers to reverse engineer compiled Java bytecode back into its original source code. It provides an intuitive interface that simplifies the process of exploring and analyzing .class files, making it an indispensable tool for both experienced programmers and newcomers to Java development. JD-GUI is a standalone graphical utility that displays Java source codes of .class files. You can browse the reconstructed source code with the JD-GUI for instant access to methods and fields.

Understanding JD-GUI and its Importance in Java Development

JD-GUI is one of the applications that can help you in the situation depicted above by providing you with everything you need for inspecting the code you just wrote and even decompile your applications in a controlled environment. Developed by Emmanuel Dupuy, this powerful tool allows users to easily decompile .class files and display the corresponding Java source code in a visually appealing and user-friendly interface. In this article, we will explore the features and functionality of JD-GUI and how it can aid developers and programmers in their work.

Whether you are a seasoned Java expert or a beginner, JD-GUI is a valuable tool that can greatly enhance your understanding and analysis of Java source codes, making it an essential addition to your programming toolkit. Furthermore, JD-GUI enables developers to explore third-party libraries or frameworks they may be using in their projects. This allows for better integration and customization by providing insights into how these components work behind the scenes.

Effortlessly view .class files with JD-GUI.

JD-GUI, a powerful standalone graphical utility, offers a seamless solution for developers and programmers seeking to effortlessly view .class files. With its intuitive interface and advanced functionalities, JD-GUI provides a convenient platform for examining and understanding the underlying Java source code within these files. By simply opening a .class file with JD-GUI, users can navigate through the codebase, explore classes, methods, and variables, and gain valuable insights into the inner workings of Java applications. The robust features of JD-GUI, such as syntax highlighting, decompilation, and code analysis, contribute to a smooth and efficient workflow, enabling developers to effectively analyze and debug their code. With JD-GUI's comprehensive capabilities, the process of understanding and reverse-engineering .class files becomes significantly more accessible and straightforward.

Intuitive and user-friendly interface.

Highlighted by its state-of-the-art design, JD-GUI's interface is both intuitive and user-friendly, providing developers with a seamless experience when working with Java source codes. The carefully crafted layout ensures that navigating through the codebase is effortless, allowing users to quickly locate specific classes, methods, and variables. The user-friendly nature of JD-GUI extends to its easy-to-use features, making tasks such as syntax highlighting, decompilation, and code analysis a breeze. With its intuitive interface, JD-GUI eliminates the need for complex navigation or extensive technical knowledge, empowering developers to focus on their code analysis and debugging tasks with utmost efficiency.

Easily navigate through Java code.

When it comes to navigating through Java code, JD-GUI proves to be an invaluable tool for developers. With its robust features and user-friendly interface, JD-GUI simplifies the process of exploring and understanding Java source codes. The software allows developers to effortlessly browse through classes, methods, and variables, enabling them to quickly locate specific sections of code. Additionally, its intuitive design eliminates the need for complex navigation techniques, ensuring that developers can easily move through the codebase with efficiency. With JD-GUI, exploring and understanding Java code becomes a seamless and hassle-free experience, empowering developers to focus on their coding tasks and boost their productivity.

Quickly locate specific methods.

When dealing with complex Java projects, efficiently locating specific methods is crucial for developers to streamline their workflow. JD-GUI provides developers with an efficient solution for this task. Its advanced search functionality allows developers to quickly locate specific methods within the codebase. By simply entering the desired method name or signature, JD-GUI swiftly scans through the Java source codes and presents the results in a clear and organized manner. This saves developers valuable time and effort, enabling them to navigate through the codebase with precision and accuracy. With JD-GUI, developers can easily locate specific methods and seamlessly continue their coding process.

Useful for reverse engineering projects.

JD-GUI is not only a valuable tool for developers but also a valuable asset for reverse engineering projects. Reverse engineering involves analyzing and understanding the functionality of existing software or applications. JD-GUI provides reverse engineers with the ability to decompile .class files and examine the Java source code. This allows them to gain insights into the inner workings of the software, understand its structure, and potentially uncover vulnerabilities or optimize the code. With JD-GUI's user-friendly interface and powerful decompilation capabilities, reverse engineers can efficiently dissect and analyze the Java code, making it an indispensable tool for reverse engineering projects.

Compatible with multiple operating systems.

JD-GUI offers the added advantage of being compatible with multiple operating systems, further enhancing its versatility and accessibility. Whether you are using Windows, macOS, or Linux, you can rely on JD-GUI to seamlessly run on your preferred platform. This compatibility eliminates the hassle of switching between different tools or environments when working on Java source code analysis. By supporting multiple operating systems, JD-GUI ensures that developers and reverse engineers can utilize its features and functionalities regardless of their preferred operating system, making it a reliable and inclusive solution for a wide range of users.

No installation or setup required.

With JD-GUI, the process of accessing and utilizing its powerful features is made even more convenient by the fact that no installation or setup is required. This eliminates the need to allocate precious time and resources for installation procedures, allowing users to quickly and effortlessly dive into their Java source code analysis. Whether you are working on a personal project or collaborating in a professional setting, the seamless access to JD-GUI without any installation prerequisites streamlines your workflow and enhances productivity. With just a few clicks, you can launch JD-GUI and begin exploring and examining Java source codes of .class files, making it an efficient and user-friendly solution for developers and reverse engineers alike.


Frequently updated for bug fixes.

To ensure a smooth and optimized user experience, JD-GUI is frequently updated with bug fixes. The development team behind JD-GUI understands the importance of addressing any issues or glitches that may arise, and they are committed to providing users with a reliable and stable tool for Java source code analysis. By regularly releasing updates, JD-GUI ensures that any bugs or vulnerabilities are promptly addressed, allowing users to work with confidence and peace of mind. This commitment to ongoing improvement exemplifies the dedication of the JD-GUI team to deliver a high-quality and dependable software solution for developers and reverse engineers.

Supports different Java versions.

JD-GUI further enhances its versatility by supporting different Java versions. Whether you are working with older legacy code or the latest Java releases, JD-GUI has you covered. This means that regardless of the version of Java your source code is written in, you can rely on JD-GUI to accurately display and analyze the corresponding .class files. With this level of compatibility, developers and reverse engineers can seamlessly navigate through Java source codes, regardless of the specific Java version used in the development process. The ability to support different Java versions reinforces the flexibility and adaptability of JD-GUI as a comprehensive tool for Java source code analysis.

Free and open-source software.

One of the many advantages of JD-GUI is that it is part of the broader ecosystem of free and open-source software (FOSS). FOSS refers to software that is developed and distributed with the freedom for users to study, modify, and distribute the code. This philosophy promotes collaboration and transparency in software development, allowing developers to freely access and customize the tools they use. By being an open-source tool, JD-GUI not only benefits from the contributions and improvements of a global community of developers, but it also empowers users to tailor the software to their specific needs. This commitment to openness and accessibility makes JD-GUI a valuable asset for developers seeking customizable and reliable tools for Java source code analysis.

JD-GUI is a valuable tool for developers and programmers looking to view and analyze the source code of Java .class files. Its user-friendly interface and comprehensive features make it an essential addition to any software development toolkit. With JD-GUI, users can easily navigate and understand complex code, saving time and increasing efficiency. Whether you are a beginner or an experienced programmer, JD-GUI is a reliable and powerful resource that will aid in your Java development journey.

JD Project

The “Java Decompiler project” aims to develop tools in order to decompile and analyze Java 5 “byte code” and the later versions.

JD-GUI is a standalone graphical utility that displays Java source codes of “.class” files. You can browse the reconstructed source code with the JD-GUI for instant access to methods and fields. JD-GUI provides you with a "Search" function that can come in handy whenever you need to locate any piece of code that might need to be inspected.

Among the elements that can be identified by this function, you can find types, methods, constructors, fields and string constants. Any string or character can be looked up by using the "*" and "?" search operators as well.

JD-Eclipse is a plug-in for the Eclipse platform. It allows you to display all the Java sources during your debugging process, even if you do not have them all.

JD-Core is a library that reconstructs Java source code from one or more “.class” files. JD-Core may be used to recover lost source code and explore the source of Java runtime libraries. New features of Java 5, such as annotations, generics or type “enum”, are supported. JD-GUI and JD-Eclipse include JD-Core library.

JD-Core, JD-GUI & JD-Eclipse are open source projects released under the GPLv3 License.

JD Project Main Features

JD-Core and JD-GUI are written in Java.
JD-Core works with most current compilers including the following:
JDK 1.1.8, JDK 1.3.1, JDK 1.4.2, JDK 1.5.0, JDK 1.6.0, JDK 1.7.0, JDK 1.8.0, JDK 9.0.1, JDK 10.0.2
Eclipse Java Compiler v_677_R32x, 3.2.1 release
JD-GUI supports Drag and Drop.
JD-GUI supports CLASS, JAR, WAR, EAR, AAR, JMOD & ZIP files.
JD-GUI displays color coded Java source code.
JD-GUI allows you to browse the CLASS files and Java modules hierarchy.
JD-GUI lets you drag and drop LOG files, decompile CLASS files, and display the line of code that appears in Java stack traces.

JD-GUI Download

JD-GUI is a standalone graphical utility that displays Java source codes of “.class” files. You can browse the reconstructed source code with the JD-GUI for instant access to methods and fields. JD-GUI was designed with Java code in mind, namely CLASS and JAR documents. However, you might want to use it on TXT and LOG files, but also ZIP archives, since they are fully supported.

Download JD-GUI for Windows
Download JD-GUI for MAC
Download JD-GUI for Linux

Comparison: JD-GUI vs Other Java Decompilers in the Market

When it comes to Java decompilers, there are several options available in the market. Among them, JD-GUI, JADX, CFR Decompiler, and Fernflower Decompiler are some of the most popular choices. Each of these decompilers has its own set of pros and cons that make them unique in their functionality. Starting with JD-GUI, it is known for its user-friendly interface and ease of use. It provides a straightforward way to decompile Java bytecode into readable source code. However, one limitation of JD-GUI is that it lacks advanced features and customization options compared to other decompilers.

On the other hand, JADX offers a more comprehensive set of features for Java decompilation. It supports not only standard Java bytecode but also Android APKs. Additionally, JADX provides advanced analysis capabilities such as code navigation and search functionality. However, some users may find its interface slightly less intuitive compared to JD-GUI.

When it comes to CFR Decompiler, it stands out for its exceptional accuracy in decompiling complex Java code. It can handle intricate control flow

structures and produce highly readable source code output. However, CFR Decompiler may not be as fast as other alternatives when dealing with larger projects.

Lastly, Fernflower Decompiler is an open-source option that offers good compatibility with different versions of Java bytecode. It is known for its stability and reliability in producing accurate decompiled code. However, Fernflower Decompiler might lack some advanced features found in commercial solutions.

The choice between JD-GUI, JADX, CFR Decompiler or Fernflower Decompiler depends on the specific needs and preferences of the user. While JD-GUI excels in simplicity and ease of use; JADX offers more advanced features; CFR Decompiler focuses on accuracy; and Fernflower Decompiler provides a reliable open-source option. Evaluating these pros and cons will help users make an informed decision based on their requirements.


How does JD-GUI work as a standalone graphical utility for displaying Java source codes of .class files?

JD-GUI works as a standalone graphical utility by decompiling Java bytecode from .class files and displaying the corresponding Java source code. It uses a combination of static analysis and pattern recognition techniques to interpret the bytecode and reconstruct the original code structure. The tool provides a user-friendly interface that allows users to navigate through the decompiled code, view class hierarchies, and search for specific methods or variables. JD-GUI also supports syntax highlighting and basic code editing features, making it a convenient tool for understanding and analyzing Java applications.

What are the advantages of using JD-GUI over other tools for viewing Java source codes?

JD-GUI is a popular tool for viewing Java source codes due to its advantages over other tools. It is free, easy to use, and provides a user-friendly interface. JD-GUI also has a good decompilation accuracy, allowing users to easily understand the source code. Additionally, it supports various platforms, including Windows, Mac, and Linux, making it accessible to a wider range of users. Furthermore, JD-GUI allows for quick navigation and searching within the code, making it efficient for analyzing and debugging Java applications. Overall, the advantages of JD-GUI make it a preferred choice for viewing Java source codes.

Can JD-GUI handle large Java projects with multiple .class files efficiently?

Yes, JD-GUI can handle large Java projects with multiple .class files efficiently. JD-GUI is a Java decompiler that allows users to view the source code of compiled Java files (.class files). It can handle large projects by efficiently decompiling and displaying the source code for each individual .class file. JD-GUI provides a user-friendly interface and allows users to navigate through the code easily. It also supports advanced features such as syntax highlighting, code search, and code navigation. Therefore, it is a reliable tool for analyzing and understanding large Java projects.

Are there any limitations or drawbacks of using JD-GUI as a standalone graphical utility?

Yes, there are limitations and drawbacks to using JD-GUI as a standalone graphical utility.


  • One limitation is that JD-GUI may not be able to accurately decompile complex or obfuscated code, resulting in incomplete or inaccurate representations of the original source code.
  • Another drawback is that JD-GUI does not provide advanced features like code search, refactoring, or debugging capabilities, which are available in integrated development environments (IDEs).
  • Additionally, JD-GUI may not be regularly updated or maintained, meaning it may not support newer versions of Java or have bug fixes and performance improvements.
  • Finally, JD-GUI lacks the ability to modify or edit decompiled code, making it only suitable for viewing and analyzing code, rather than actively working on projects.

Is JD-GUI compatible with all versions of Java and operating systems?

Yes, JD-GUI is compatible with all versions of Java and most operating systems.

DJ Java Decompiler

Other Java Decompilers

DJ Java Decompiler

With DJ Java Decompiler you can decompile java class-files and save it in text or other format. It's simple and easy.

DJ Java Decompiler is Windows XP, Windows 2003, Windows Vista, Windows 7, Windows 8, 8.1 and 10 decompiler and disassembler for Java that reconstructs the original source code from the compiled binary CLASS files (for example Java applets). DJ Java Decompiler is able to decompile complex Java applets and binaries, producing accurate source code. It lets you quickly obtain all essential information about the class files. It might be easy to decompile the Java files with DJ Java Decompiler.

DJ Java Decompiler is a stand-alone Windows application; it doesn't require having Java installed! DJ Java Decompiler is not just Java decompiler and disassembler but it is also a fully featured Java editor using the graphical user interface with syntax-coloring. Using DJ Java Decompiler is easy. Select "Open" and load your desired class file, or just double-click the CLASS file you want to decompile. DJ Java Decompiler supports drag-and-drop functions for OLE. You will see the source code instantly! In "Windows Explorer" Right mouse-button pop-up menu available too. You can decompile or disassembler a CLASS files on your computer hard disk or on a network drive that you have a connection to (you must have write privileges or just change the default output directory for .jad files).

You don't need to have the Java Virtual Machine or any other Java SDK installed. But this release is able to compile, run, create JAR archives and run applets outside of the context of a Web browser when JDK is installed.

With DJ Java Decompiler you can decompile more than one java class file at one time. "Tools"-> "Decompile more files…" allows you to select and decompile more than one Java compiled file at one time.

This release enables users to decompile "dead" parts of code. It can add the original line numbers as the comments in the decompiled file, that is very useful for debugging.

DJ Java Decompiler is suitable for studying JAVA bytecode. The program enables users to save, print, edit and compile the generated java code. Included Applet Tag Editor enables users to create applets quickly.

Included "Archiver" tool is a simple archive file manager wich enables users to work with .JAR, .ZIP, .APK, .EAR, .WAR and .EXE archives. . This tool lets you create or view archives, extract files from archives, decompile .class files from archives, etc. The option "Use folder names stored in archive" enables users to decompile whole class tree.

The "Hexadecimal View" - F11 shows the file in hexadecimal. This view lets you examine the file at the lowest possible level.

Special information features added in this latest version: "Class version info" (shows the JVM version, Major and Minor version), "Access flags", "Superclass", "Methods, Interfaces and Constant Pool", "Fields", "Attributes", "General Information".

DJ Java Decompiler is a graphical decompiler and disassembler for Windows XP/2003/Vista/7/8/10 that uses the command-line version of Jad as its decompiling engine . There is a link to another Java Decompiler home page

Download DJ Java Decompiler

Why is a DJ Java Decompiler useful?

- DJ Java Decompiler is useful for recovery of lost or accidentally destroyed source code.
- Decompiling Java is an excellent way of learning both Java and how the Java VM works. DJ Java Decompiler makes it easy to peek into Java classes and learn from the source. Its easy to use and intuitive graphical user interface eases the learning curve for new starters in Java.
- Fixing and debugging .class files. Use DJ Java Decompiler when developers are slow to respond to questions that need immediate answers.
- DJ Java Decompiler is useful for exploring the sources of Java runtime libraries.
- Like the possibility to inline bytecode.
- To check the results of your class file obfuscation;) It's really useful to ensure that your code is adequately obfuscated before releasing it into the public domain.

How to use DJ Java Decompiler

DJ Java Decompiler is intuitive enough that you can probably skip the instructions. Once you have downloaded and installed it, use the "File" -> "Open" dialog to open your CLASS or JAR file.

You can do one of the following (the choice is yours):

- Select "File" -> "Open" and load your desired class file. Select "File" -> "Open in New Window" if you want to open the class file in new program instance.
- Double-click the CLASS file you want to decompile.
- Drag-and-drop your desired class file into the DJ Java Decompiler window. DJ Java Decompiler supports drag-and-drop functions for OLE.
- In Windows Explorer right mouse-button pop-up menu is available too. - "Open with DJ" To decompile a .JAR file: Select "File" -> "Open" and load your desired jar file. This jar file will be loaded in the "Archiver" tool. Use "Archiver" tool to decompile a single class file inside the selected archive or all class tree. To decompile a single class file inside the JAR archive - just double-click the class file.
- To decompile the whole class tree: Select "Tools" -> "Decompile more files…". Click "Whole class tree" radio-button. Select the directory with classes and the destination directory. Click on "Decompile" button.

When user opens and decompiles a class file, DJ Java Decompiler creates a temporary file with .jad extension. By default the output folder is the folder of the class file.

The most common problem with DJ Java Decompiler is when the user doesn't have write privileges on this output folder (for example from CD or DVD drives). To solve this user can select another output location for .jad files from "Settings" - "Configuration" - "General" tab - un-check "Use Default Output Directory for .JAD files" - "Select Output Directory for .JAD files". User needs to change the output location of .jad files when working on slow media (floppy disks, tapes, external devices) or on network drives.

Jdecompiler can decompile the java class file very easily. Jdecompiler is a very small tool, that can use your favorite text editor to decompile and view the java class file.

Jdecompiler can add the original line numbers as the comments in the decompiled file that is very useful for debugging. It is simply to use, you only need to specify your favorite text editor firstly. Then you can double click a class file from the Explorer or a jar(zip) file freely. It will automatically start your favorite text editor to decompile the class file and view the decompiled source code. It is very small, and very fast to run and can use your favorite text editor to decompile and view the java class file.


To conclude JD-GUI Java-Decompiler works on Windows operating system(s) and can be easily downloaded using the below download link according to Freeware license. JD-GUI Java-Decompiler download file is only 5 MB in size.
JD-GUI Java-Decompiler was filed under the Java and Javascript category and was reviewed in softlookup.com and receive 5/5 Score.
JD-GUI Java-Decompiler has been tested by our team against viruses, spyware, adware, trojan, backdoors and was found to be 100% clean. We will recheck JD-GUI Java-Decompiler when updated to assure that it remains clean.

JD-GUI Java-Decompiler user Review

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Popularity 10/10 - Downloads - 6303 - Score - 5/5

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Category: Java and Javascript 
Publisher: Paul Roberts
Last Updated: 03/12/2023
Requirements: Not specified
License: Freeware
Operating system: Windows
Hits: 3351
File size: 5 MB
Price: Not specified

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