Open JAR files online

Open JAR files online

Look inside Java archives and extract their files, without Java.

Updated: November 8, 2026

What is a JAR file?

A JAR (Java ARchive) is a ZIP file that holds a Java program or library: compiled .class files, resources such as images and settings, and a META-INF/MANIFEST.MF file that describes it. Minecraft mods and many desktop tools are JAR files.

How to open JAR files here

  1. Click Browse above, or drop the JAR file on the box.
  2. The archive is opened on your device and its files are listed with their sizes.
  3. Click Download all as ZIP, tick the files you want and download them, or download a single file. Pictures and text files can be previewed first.

Good to know

  • Opening a JAR here only shows its contents; it does not run the program. To run it, install Java and use java -jar file.jar.
  • The MANIFEST.MF and other text files can be previewed directly. .class files are compiled code; you need a Java decompiler to read them as source.