How do I open a .CLASS file on Windows or Mac?

You can open .CLASS files using Java Virtual Machine (JVM), JD-GUI Decompiler, IntelliJ IDEA. If you do not have native software installed, you can use OpenAnyFile's free File Identifier or convert .CLASS to a standard format in your browser.

Is a .CLASS file safe to open?

This format carries a safety rating of Low Risk. Decompile to readable Java code using JD-GUI or CFR decompiler

Can I convert a .CLASS file to other formats?

Yes! .CLASS can be converted to formats such as .JAVA directly in your web browser.

What should I do if a .CLASS file is corrupted or won't open?

If your .CLASS file displays an invalid header or signature error, check its magic bytes hex header (Varies) using OpenAnyFile's Magic Byte Detector or follow our step-by-step file repair guide.

How do I open .CLASS files?

You can open .CLASS files using Java Virtual Machine (JVM), JD-GUI Decompiler, IntelliJ IDEA.

Code & Data • MIME: application/java-vm

.CLASS – CLASS File Format

Q: What is a .CLASS file?

A .CLASS file is a CLASS File Format associated with Code & Data. CLASS files contain compiled Java Virtual Machine (JVM) bytecode instructions created from .java source files, executable across any OS with Java Runtime (JRE).

CLASS files contain compiled Java Virtual Machine (JVM) bytecode instructions created from .java source files, executable across any OS with Java Runtime (JRE).

Primary Category Code & Data

MIME Type application/java-vm

Magic Bytes Signature Varies

Security Risk Rating Low Risk

Recommended Software to Open .CLASS

Java Virtual Machine (JVM)

windows, mac, linux • Free

JD-GUI Decompiler

windows, mac, linux • Free

IntelliJ IDEA

windows, mac, linux • Free