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The best way to get the official library is through the Android Studio SDK Manager or by downloading the SDK Platform-Tools .
If you are working in a modern Java environment (Java 8 or higher), you don't actually need the Android-specific JAR. Java introduced its own native java.util.Base64 class which is often faster and "more correct" in its behavior. android.util.Base64 java.util.Base64 (Java 8+) Android API 8+ Java SE 8+, Android API 26+ Usage Base64.encode(data, Base64.DEFAULT) Base64.getEncoder().encode(data) Performance Optimized for mobile 10x faster in desktop environments Popular Alternatives
Do you use java.util.Base64 or android.util.Base64 in your app?
The android.util.Base64 class is a staple for Android developers, providing a fast and reliable way to encode and decode binary data into a string format. However, because it is part of the Android framework, it is not natively available in standard Java (JSE) or desktop environments, leading developers to seek a standalone JAR or alternative solutions for cross-platform projects. Where to Find the JAR File
Since android.util.Base64 is bundled within the Android SDK, the "JAR" most developers are looking for is actually .
If you have the Android SDK installed, you can find android.jar in your platforms directory, typically at: C:\Users\ \AppData\Local\Android\Sdk\platforms\android- \android.jar .
If you are working on a project that must run on both Android and a standard Java server, using a third-party library ensures consistency without needing to download platform-specific JARs:
For unit testing or non-Android environments, you can find community-maintained versions of the Android utilities on the Maven Repository or archived android.jar files on GitHub . Why You Might Not Need the JAR
