How do I convert Base64 string to image file?

In the previous example, How do I convert an image file to a Base64 string?, you’ve seen how to convert image file to base64 string.

In this example, you will see how you can convert a base64 string back into an image file. Below are examples of how to do this in Java, using the Java 8 native java.util.Base64 class.

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

public class Base64ToImage {
    public static void main(String[] args) throws Exception {
        // this is your Base64 encoded string
        String base64String = "iVBORw0...";

        byte[] decodedBytes = Base64.getDecoder().decode(base64String);
        Files.write(Paths.get("/path/to/your/outputimage.png"), decodedBytes);
    }
}

Just replace “/path/to/your/outputimage.png” with the actual path where you want to save the image.

This code will decode the base64 string back into a byte array, and then it will write this byte array into an image file. Be careful with the format of the image (PNG, JPG, etc.) as the format of the output file should match the format of the original base64-encoded image.

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Wayan

Founder at Kode Java

A programmer, runner and recreational diver, lives on the island of Bali, Indonesia. Programming in Java, Spring Framework, Hibernate / JPA, MySQL. To support me working on this project, buy me a cup of coffee, every little bit helps. Thank you.

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