D8.jar | [updated] Download

You won’t typically download d8.jar in isolation — it comes bundled with the Android SDK. However, advanced users or custom build systems (e.g., Bazel, custom Gradle-less setups) may want to access it directly.

– Convert a JAR of class files into one or more DEX files: d8.jar download

This happens if you compile your Java code with a version of Java that your current d8.jar version does not support yet (e.g., using Java 21 with an older D8 build). You won’t typically download d8