Jar File Opener

Jar File Opener lets you open, inspect and extract JAR files directly on your device.

Browse archive contents, inspect manifest information, view CLASS files, preview compiled data in Hex, and decompile supported CLASS files for easier code inspection.

Key Features

Open JAR Files
Browse and select .jar files from your device storage.

View JAR Information
Check file name, size and archive information at a glance.

Read Manifest Information
Inspect META-INF/MANIFEST.MF entries such as:

• Main-Class
• Created-By
• Manifest-Version

Browse Archive Contents
Explore files and folders stored inside a JAR archive, including resources, images, text files and CLASS files.

Extract JAR Contents
Extract supported files and folders from the archive to your device.

Inspect CLASS Files
Open CLASS files contained in a JAR and inspect their compiled structure and contents.

Hex Preview
View raw CLASS file data in hexadecimal format.

Decompile CLASS Files
Decompile supported CLASS files into readable Java source-style code for easier inspection and learning.

Check Main-Class Information
Detect whether a JAR declares a Main-Class entry in its manifest, which may indicate that it is intended to be launched as an application.

Fast Local Processing
JAR and CLASS file inspection is performed locally on your device.

What Is a JAR File?

A JAR (Java Archive) file is an archive format commonly used to package applications, libraries, CLASS files and related resources.

Jar File Opener helps you inspect the structure and contents of JAR files without requiring a full runtime environment.

Useful For

• Inspecting downloaded JAR files
• Reading manifest information
• Browsing archive contents
• Extracting files from JAR archives
• Inspecting CLASS files
• Viewing compiled data in Hex
• Decompiling supported CLASS files
• Checking Main-Class information

Important

Jar File Opener is a file inspection and extraction tool.

It does not provide a full runtime environment and does not execute JAR applications.

Decompiler output is generated from compiled CLASS files and may differ from the original source code.

Class inspection and decompiler features are intended for learning, analysis and authorized file inspection. Please respect copyright, software licenses and applicable laws when using these features.