Edit .class Files in the Browser (No Recompile)

A browser Java class editor: change strings, numbers, booleans, and annotations in a .class file with no decompile or recompile. Worked examples and a safe-edit checklist.

A Java Class Editor That Runs in Your Browser

How to Edit a .class File Online (Steps)

Before / After: What an Edit Looks Like

Why a Value Might Not Show Up

The Safe Edit Checklist

Constant Editing vs Bytecode Editing vs Decompile/Recompile

What Constant Editing Can't Do

Common Real Edits

If the JAR Is Signed

Summary