Java Convert File to Base64 String

Tags: Java Base64

In this Java tutorial we learn how to convert a binary file, image file or text file into Base64 encoded String in Java programming language.

How to convert a File to Base64 String in Java

In Java to convert a file to Base64 String object firstly we need to read all bytes of the file and then use the Base64.getEncoder().encodeToString() method to encode it to Base64 String. 

byte[] byteData = Files.readAllBytes(Paths.get("/path/to/the/file"));
String base64String = Base64.getEncoder().encodeToString(byteData);

For example, we have an image file at D:\SimpleSolution\qrcode.png, the following Java program to show you how to convert this image file to a Base64 String.

FileToBase64StringExample1.java 

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Base64;

public class FileToBase64StringExample1 {
    public static void main(String... args) throws IOException {

        // Read all bytes from a file and convert to Base64 String
        byte[] byteData = Files.readAllBytes(Paths.get("D:\\SimpleSolution\\qrcode.png"));
        String base64String = Base64.getEncoder().encodeToString(byteData);

        System.out.println(base64String);
    }
}
The output as below. 
iVBORw0KGgoAAAANSUhEUgAAAGQAAABkAQAAAABYmaj5AAAA7ElEQVR42tXUsZHEIAwFUHk2cHZuQDO0QeaWTAN4twK3REYbzNAAyhww1ombvd1NbBHeMQS8CPERAH+MAn9YBWCBzAEGTcR13W8cZaEpoLdpiuA6tIb86JWhHnH1tq7vyk4l53MR3fu0p2pZzbJ8JXiqYtHP6H53uBAH3mKadpg0HRZhRrCZNBHzxnWIadBUbILRbK/KzkXxRhEHNpumMuLXLPOZ4IVoz4flA5LTlTzkO+CkqeU/Sgy65G59q92QptbXLIEZVhXQsblDlxZIy8iPDsmrIn5mdiWui/QCoKr2pq35CUPRf/nBPvUNct67nP2Y9j8AAAAASUVORK5CYII=

Happy Coding 😊

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