How to mass convert BMP to JPG (Tutorial)

BMP (Bitmap) is a raster graphics format known for its simplicity and compatibility. It stores image data in an uncompressed format, resulting in large file sizes.

BMP images are commonly used in Windows environments and supported by various software applications. Converting BMP images to JPG can significantly reduce file size, making them easier to store and share while maintaining reasonable image quality.

In this article, I’ll guide you through the process of using Java to convert BMP files to JPG format with JDeli, ensuring your images are accessible.

Mass convert BMP to JPG using Java

1. Download the JDeli trial jar.
2. Process image if needed (scale, sharpen, lighten, watermark, etc)
3. Write out BufferedImage as JPG image file

BufferedImage bufferedImage = JDeli.read(new File("bmpImageFile.bmp"));
// Read BMP image into Java

bufferedImage = operations.apply(BufferedImage bufferedImage);
// Process BMP image (Optional)

JDeli.write(bufferedImage, "jpg", new File("jpgImageFile.jpg"));
// Write out BufferedImage as JPEG image file

Export BMP to JPG in one line of code

With the JDeli.convert() method you can save BMP as JPG in just one line of code.

Using File

JDeli.convert(File inFile, File outFile);

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

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

You can configure output settings, such as image compression, by specifying an EncoderOptions object with this option.

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

How to bulk convert BMP to JPG from the command line

You can use command line or bash, bat, and PowerShell scripts to mass convert BMP to JPG. This method also allows you to invoke JDeli from any programming language that supports creating a child process.

java -jar jdeli.jar –convert jpg "inputFileOrDir" "outputDir"

// Read an image
BufferedImage bufferedImage = JDeli.read(dicomImageFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(heicImageFile);

// Write an image
JDeli.write(bufferedImage, "heic", outputStreamOrFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(jpegImageFile);

// Write an image
JDeli.write(bufferedImage, "jpeg", outputStreamOrFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(jpeg2000ImageFile);

// Write an image
JDeli.write(bufferedImage, "jpx", outputStreamOrFile);

// Write an image
JDeli.write(bufferedImage, "pdf", outputStreamOrFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(pngImageFile);

// Write an image
JDeli.write(bufferedImage, "png", outputStreamOrFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(tiffImageFile);

// Write an image
JDeli.write(bufferedImage, "tiff", outputStreamOrFile);

// Read an image
BufferedImage bufferedImage = JDeli.read(webpImageFile);

// Write an image
JDeli.write(bufferedImage, "webp", outputStreamOrFile);