Open JAR Files Online
A JAR packages compiled Java classes, resources and a manifest into a ZIP file. It can be a library or a runnable application.
Java Archive · .jar
What you see in the JAR viewer
- All packages, classes and resources
- The MANIFEST.MF and other text files
- Sizes and compression
- Downloads of single files
Other ways to open JAR files
Windows
Rename to .zip or use 7-Zip to look inside; Java runs it.
macOS
Archive tools or the jar command.
Phone & tablet
Use this viewer to inspect the contents.
Frequently asked questions
Is my JAR file uploaded?
No. The file is read by your browser and shown on your own device. Nothing is sent to a server, and it is gone when you close the tab.
How do I open a JAR file without installing software?
Drop the .jar file on this page. It opens straight away in the ZIP & Archive Viewer, on Windows, macOS, Linux, Android and iPhone alike.
What if my JAR file doesn't open?
The viewer checks the file's content, not just its name. If it is damaged or not really a JAR file, you'll see an error or can switch to the hex view to look at the raw bytes.