CLASS File

What are CLASS files and how to open them

Are you having problems opening a CLASS file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a CLASS file?

A .CLASS file is a Java Bytecode file.

Files containing the .class file extension are primarily associated with files written in the Java programming language. These files are compiled bytecode class applications.

They are created by compiling different Java source code files. The Java source code files are compiled to create the resulting CLASS file, which is then loaded into the Java Virtual Machine. At that point, the Java Virtual Machine executes the application.

It is important to note that because there are different versions of the Java Virtual Machine, not all CLASS files will be compatible with each version.

How to open CLASS files

We have identified two CLASS openers that are compatible with this specific type of CLASS file.

Programs that open Java Bytecode files

NetBeans IDENetBeans IDEVerified
BlueJBlueJVerified

Last updated: January 16, 2023

Various apps that use files with this extension

These apps are known to open certain types of CLASS files. Remember, different programs may use CLASS files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Microsoft Web Platform ExtensionsMicrosoft Web Platform ExtensionsUser submitted
DJ Java DecompilerDJ Java DecompilerUser submitted
Notepad++Notepad++User submitted
7-Zip7-ZipUser submitted
TextPadTextPadUser submitted
Ready to Program for Java TechnologyReady to Program for Java TechnologyUser submitted
TeraPadTeraPadUser submitted
cavaj Java Decompilatorcavaj Java DecompilatorUser submitted
Adobe AcrobatAdobe AcrobatUser submitted
Eclipse IDEEclipse IDEUser submitted

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CLASS file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.