CLASS viewer
To open a CLASS file, drop it in the box below. It opens straight away, even with no extension or the wrong one. Your browser opens it on your device: nothing is uploaded.
Open in
Opened on this device, never uploadedDrop or paste another file at any time
What you see
| CLASS in the viewer | |
|---|---|
| Java version | From the class file version |
| Methods | Listed with their parameters |
| Safety | Read from its headers only: nothing in it is run |
| Extensions | .class |
| Upload | None: opened on your device |
What is a CLASS file?
In short
A .class file is compiled Java: one class, its fields and methods, run by the Java virtual machine.
The class name, what it extends and implements, the Java version it needs, its source file name, and its methods and fields.
How to open a CLASS file
- Add your CLASS. Drop the file in the box, choose it or paste it.
- Look at it. The class name, what it extends and implements, the Java version it needs, its source file name, and its methods and fields.
- Take it further. Download any file from inside an archive, or open another file.
Questions
Drop it here: the class file version is read and named, from Java 1.1 to the newest.
Yes. The viewer reads the file’s headers as data; the program never runs. Nothing is uploaded either.
No. The viewer runs in your browser and opens the file on your device. Nothing is sent anywhere.