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
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 .
The best way to get the official library is through the Android Studio SDK Manager or by downloading the SDK Platform-Tools . android.util.base64 jar download
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:
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 If you are working in a modern Java
Since android.util.Base64 is bundled within the Android SDK, the "JAR" most developers are looking for is actually .
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 The best way to get the official library
Do you use java.util.Base64 or android.util.Base64 in your app?