dex2jar

Android DEX to JAR file converter

TLDR

Convert DEX to JAR

$ d2j-dex2jar [classes.dex]

Convert APK to JAR

$ d2j-dex2jar [app.apk]

Specify output file

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

Force overwrite

$ d2j-dex2jar -f [classes.dex]

Convert JAR to DEX

$ d2j-jar2dex [file.jar]

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.

PARAMETERS

-o file

Output JAR file name.

-f, --force

Overwrite existing output.

-e file

Output exception details to file.

-n, --not-handle-exception

Don't handle exceptions.

-nc, --no-code

Don't convert code.

-d, --debug-info

Include debug information.

-r, --reuse-reg

Reuse registers.

RELATED TOOLS

d2j-jar2dex: Convert JAR to DEXd2j-apk-sign: Sign APK filesd2j-asm-verify: Verify ASM coded2j-dex-recompute-checksum: Fix DEX checksums

CAVEATS

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

HISTORY

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.