Convert JPG to PNG

The JDeli Java image conversion library comes with JPEG support makes it very easy to convert JPEG to PNG image files in Java and other languages/scripts.

To run the code examples you will need to download the JDeli jar:

Download JDeli

How to convert JPEG into PNG in Java

1. Read JPEG image into Java

   BufferedImage bufferedImage = JDeli.read(new File("jpgImageFile.jpg"));  
   

2. Process image if needed (scale, sharpen, lighten, watermark, etc)

   bufferedImage = operations.apply(BufferedImage bufferedImage); // Optional
   

3. Write out BufferedImage as PNG image file

   JDeli.write(bufferedImage, "png", new File("pngImageFile.png"));
   

View Javadoc

Export JPEG to PNG in one line of code

The JDeli.convert() methods allow you to save JPEG as PNG in just ONE line of code!

Using File

JDeli.convert(File inFile, File outFile);

Using InputStream and OutputStream

JDeli.convert(InputStream inputStream, OutputStream outputStream, "png");

Using byte[]

byte[] outputData = JDeli.convert(byte[] inputData, "png");

Configure Output Settings

This option allows you to specify an EncoderOptions object to configure output settings such as image compression.

JDeli.convert(File inFile, EncoderOptions outputOptions, File outfile);

Batch convert JPEG to PNG from command line

Convert images from command line or bash, bat, and powershell scripts. This method can also be used to invoke JDeli from any programming language that allows you to create a child process.

java -jar jdeli.jar --convert png "inputFileOrDir" "outputDir"