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Merge PDF with Java REST API

This short tutorial demonstrates how PDF Java developers can combine multiple PDF documents using the Aspose Cloud REST API, providing a clear, step‑by‑step guide to merge all PDFs online. For more information about the PDF format, see the PDF file info page.

Prerequisite

Steps to Combine PDF with Java Low Code API

  1. Set API key and SID for initializing the PdfApi class object.
  2. Create the MergeDocuments object and provide the list of PDF files that you want to merge.
  3. Upload all the source PDF files using the UploadFile() method in the PdfApi class.
  4. Call the PutMergeDocuments() method to merge all the PDF files into a single destination PDF file.
  5. Download and save the output PDF file containing the contents of all the merged PDF files.

These steps summarize how to merge PDF online with Java REST API. Use the MergeDocuments class to build the list of files, upload them with PdfApi.uploadFile(), and invoke PutMergeDocuments() to perform the merge. After a successful response, call downloadFile to retrieve the combined PDF.

Code to Combine PDF Files with Java-based API

The sample shows how to concatenate PDF files using the Java REST interface. Ensure the file names used in UploadFile() match those listed in the MergeDocuments object. When downloading the resulting PDF, set the Position parameter to zero; otherwise the file cannot be saved correctly.

This article explains how to merge PDF documents online with the Java‑based API. To create an empty PDF file, refer to the following article: Create a PDF Document with Java REST API.

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