Do I need to install CFR?

No. Just download cfr.jar and run java -jar cfr.jar. Java (JRE or JDK) must already be installed.

Does CFR support modern Java (17, 21)?

Yes — CFR is actively maintained and supports recent Java versions including sealed classes, records, and pattern matching.

What's the difference between CFR and JD-GUI?

JD-GUI is a graphical desktop app; CFR is command-line only. CFR is more accurate, more actively maintained, and better for scripting. See CFR vs JD-GUI vs Procyon for a full comparison.

How accurate is CFR output?

CFR produces high-quality output, but decompiled code is reconstructed — it may differ cosmetically from the original source. Logic is preserved. ---

Download CFR (cfr.jar) — Official GitHub Release & Command Line Guide

Download the official cfr.jar from GitHub and decompile JAR or .class files from the command line. Covers CFR commands, key options, and a no-install online alternative.

Download CFR (cfr.jar) — Official GitHub Release & Command Line Guide

CFR Download

Step 2: Decompile a JAR File

Step 3: Decompile a Single Class File

Useful Options

Common Options Reference

Decompiling Multiple JARs (Batch)

Searching Decompiled Output

FAQ

Don't Want to Use the Terminal?