Efficient way to merge larger size PDF

Aspose.PDF Product Family
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1

We are planning to implement the merging the larger size PDF files in Java. Final file size could be more than 1 GB. Is there any efficient way to handle larger size of attachment without consuming more memory

2

@ashok.mahendran

To efficiently merge larger PDF files in Java, especially when dealing with final file sizes exceeding 1 GB, you can utilize streams to minimize memory consumption. Here’s a sample implementation that demonstrates how to concatenate multiple PDF files using PdfFileEditor from the Aspose.PDF library:

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import com.aspose.pdf.facades.PdfFileEditor;

public class MergeLargePDFs {
    public static void main(String[] args) {
        try {
            // Create a PdfFileEditor object
            PdfFileEditor editor = new PdfFileEditor();
            
            // Output stream for the merged PDF
            FileOutputStream outStream = new FileOutputStream("mergedOutput.pdf");
            
            // Array of input streams for the PDF files to be merged
            FileInputStream[] inputStreams = new FileInputStream[2];
            inputStreams[0] = new FileInputStream("largeFile1.pdf");
            inputStreams[1] = new FileInputStream("largeFile2.pdf");
            
            // Concatenate the PDF files
            editor.concatenate(inputStreams, outStream);
            
            // Close the output stream
            outStream.close();
            // Close the input streams
            for (FileInputStream inputStream : inputStreams) {
                inputStream.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Explanation:

  • PdfFileEditor: This class provides methods to manipulate PDF files, including merging.
  • FileInputStream: Used to read the PDF files. This approach allows you to handle large files without loading them entirely into memory.
  • FileOutputStream: Used to write the merged output to a new PDF file.

By using streams, you can efficiently manage memory usage while merging large PDF files. Make sure to handle exceptions and close your streams properly to avoid memory leaks.

For more details, you can refer to the example provided in the Aspose GitHub repository here.