Download _best_: D8.jar

Google hosts the build tools on their servers. You can construct the download URL using the version number.

Once you have located or extracted your d8.jar file, you can execute it manually using the Java Runtime Environment (JRE). This is highly useful for automated build scripts, reverse engineering, or lightweight environments where Gradle isn't used. Basic Syntax

implementation("com.android.tools:r8:8.2.0")

Output will be in build/libs/d8.jar

java -jar d8.jar \ --lib /path/to/android.jar \ --min-api 29 \ --output dex_output/ \ MyClass.class AnotherClass.class

To compile a Java class file ( MyClass.class ) into a DEX file: java -jar d8.jar --output ./output_dex/ MyClass.class Use code with caution. Compiling Multiple Files and Libraries

Google open-sourced R8 (which contains d8). You can build it yourself: https://github.com/r8-keep/r8

After installation, you'll find D8 in the Build Tools directory.