dex2jar

Convert DEX to JAR

$ d2j-dex2jar [classes.dex]

$ d2j-dex2jar [app.apk]

$ d2j-dex2jar -o [output.jar] [classes.dex]

$ d2j-dex2jar -f [classes.dex]

$ d2j-jar2dex [file.jar]

d2j-dex2jar [options] dex-file

dex2jar converts Android DEX (Dalvik Executable) files to Java JAR files. This enables analysis of Android applications using standard Java decompilers.
The tool is commonly used for Android reverse engineering, security analysis, and studying app behavior. It handles the differences between Dalvik bytecode and JVM bytecode.

-o file

Output JAR file name.

Overwrite existing output.

Output exception details to file.

Don't handle exceptions.

Don't convert code.

Include debug information.

Reuse registers.

d2j-jar2dex: Convert JAR to DEX
d2j-apk-sign: Sign APK files
d2j-asm-verify: Verify ASM code
d2j-dex-recompute-checksum: Fix DEX checksums

Conversion may not be perfect. Obfuscated code remains obfuscated. Some Dalvik features have no JVM equivalent. Legal restrictions may apply to reverse engineering.

dex2jar was created by Bob Pan (pxb1988) for Android reverse engineering. It became a standard tool in the Android security research community, often used alongside jd-gui for decompiling the resulting JAR files.

apktool(1), jadx(1), jd-gui(1), smali(1)