If you are working on a legacy project (Java 7 or older) or need specialized features, you will need to download an external library JAR: Java Base64 download | SourceForge.net
import java.util.Base64; public class Main public static void main(String[] args) String original = "Hello World"; // Standard usage of getEncoder().encodeToString() String encoded = Base64.getEncoder().encodeToString(original.getBytes()); System.out.println(encoded); Use code with caution. 2. External JAR Alternatives for Older Java Versions base64.getencoder().encodetostring jar download
If you are using , the java.util.Base64 class is already available in your JDK. You do not need to download an extra JAR file. You can simply import it in your code: If you are working on a legacy project