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Sunday, July 2, 2023

How to read and write Images in java using ImageIO Utility

Writing an Image file in Java is very common scenario and in this article we will see a new way to write images into file in Java. javax.imageio.ImageIO is a utility class which provides lots of utility method related to images processing in Java. Most common of them is reading form image file and writing images to file in java. You can write any of .jpg, .png, .bmp or .gif images to file in Java. Just like writing, reading is also seamless with ImageIO and you can read BufferedImage directly from URL.

Reading Images are little different than reading text or binary file in Java as they they are associated with different format. Though you can still use getClass().getResourceAsStream() approach for loading images.

Image Read Write Example using ImageIO

Code Example Image Read and Write in Java

Here is complete Code Example of reading and writing Images to file in Java, we will first read the image and than write the same image in different format e.g. JPG, PNG and BMP into disk.

In this code Example of javax.imageio.ImageIO class we will see:

How to read Buffered Image in Java from File or URL
How to write JPG images to file in Java
How to write PNG images to file in Java
How to write BMP images to file in Java
How to write GIF images to file in Java

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;

public class ImageIOExample {    

    public static void main( String[] args ){
       BufferedImage image = null;
        try {

              //you can either use URL or File for reading image using ImageIO
            File imagefile = new File("C://Documents and Settings/Javin/My Documents/My Pictures/loan.PNG");
            image =;

            //ImageIO Image write Example in Java
            ImageIO.write(image, "jpg",new File("C:\\home_loan.jpg"));
            ImageIO.write(image, "bmp",new File("C:\\credit_card_loan.bmp"));
            ImageIO.write(image, "gif",new File("C:\\personal_loan.gif"));
            ImageIO.write(image, "png",new File("C:\\auto_loan.png"));

        } catch (IOException e) {

Apart from seamless support of reading and writing images in Java, ImageIO class also contains lot of other utility methods for locating ImageReaders and ImageWriters and performing encoding and decoding.

How to read and write Images in java using ImageIO Utility

That's all on this Reading and Writing Image File in Java using javax.imageio.ImageIO. Let me know if you face any issue while trying these examples of ImageIO.

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Anonymous said...

This is a big help. I was having some trouble in correctly reading an image file needed for a Lab. I will be sure to use Javarevisited as a resource.

Javin @ ClassLoader in Java said...

@Thanks for your comment. Glad to here that you find Javarevisited blog helpful.

Anonymous said...

Is tif also supported?

File imagefile = new File line indicates ""Illegal start of expression" when I tried the example.


Java said...

ImageIO class is useful in Java as it can read and write image file. I have written many programs including image editor, image compression,... that use the ImageIO class. You may want to check those programs at

Anonymous said...

Should you close the file after reading or does this happen automatically? I have seen references to memory leaks if the application does not explicitly close the file. How would one do this in your example?

Anonymous said...

By using this i am getting

Exception: javax.imageio.IIOException: Unsupported Image Type

Please give the solution.

Anonymous said...

By using this i am getting

javax.imageio.IIOException: Can't read input file!
at Imageread.Imageread.main(

Please give the solution.

yashwanth j said...

pixel value got changed after writing the pixel into the image by using ImageIO.write method..i dont why.can you help me out..

Anonymous said...

if i wish to amke my program such that i would like the user to input the location of file to be converted into another format then there is a problem, the problem being that how can i input //

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