Java WebP Library — Read, Write & Convert WebP Files

// Read a WebP with alpha into a BufferedImage
BufferedImage image = JDeli.read(webpFile);

// Detect if the image has alpha
boolean hasAlpha = image.getColorModel().hasAlpha();
// Type 2 = TYPE_INT_ARGB when WebP contains transparency
int imageType = image.getType();

// Write a BufferedImage to WEBP with compression options
final WebpEncoderOptions options = new WebpEncoderOptions();

// Choose compression: Lossy or Lossless
options.setCompressionFormat(WebPCompressionFormat.LOSSLESS);

JDeli.write(myBufferedImage, options, outputFile);

// Or use Lossy — much smaller file size
options.setCompressionFormat(WebpCompressionFormat.LOSSY);

JDeli.write(myBufferedImage, options, outputFile);

// Convert WebP to JPEG with background fill for alpha
BufferedImage webp = JDeli.read(webpFile);

// JPEG has no alpha — composite onto a white background
BufferedImage rgb = new BufferedImage(
    webp.getWidth(), webp.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g = rgb.createGraphics();
g.setColor(Color.WHITE);
g.fillRect(0, 0, rgb.getWidth(), rgb.getHeight());
g.drawImage(webp, 0, 0, null);
g.dispose();

JDeli.write(rgb, "jpeg", outputFile);

// Resize a WebP to fit within target dimensions (preserves aspect ratio)
ImageProcessingOperations operations = new ImageProcessingOperations();
operations.resizeToFit(targetWidth, targetHeight);

JDeli.convert(inputFile, outputFile, operations);

// Or generate a thumbnail
ImageProcessingOperations thumbOps = new ImageProcessingOperations();
thumbOps.thumbnail(150, 150);

JDeli.convert(inputFile, outputFile, thumbOps);

// Strip WebP metadata by reading and re-writing
BufferedImage image = JDeli.read(inputFile);

// Write back — produces a clean WebP without the original ancillary chunks
WebpEncoderOptions options = new WebpEncoderOptions();
JDeli.write(image, options, outputFile);