How to View the Contents of a JAR File

Want to see what's inside a JAR file? Learn how to view JAR contents online (no install) and with command-line tools on Windows, Mac, and Linux.

Quickest Method: View Online With No Install

View JAR Contents With the Command Line

Viewing Class Files (Bytecode vs Source)

Viewing Manifest and Metadata

Opening a JAR in an IDE

Summary: Fastest Tool for Each Task