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Change PDF Password using Java REST API

PDF Java developers can effortlessly reset a password‑protected PDF file by leveraging the Aspose.PDF Cloud REST API. This guide walks you through the required steps to provide the current password, specify new user and owner passwords, and retrieve the updated document—all using the Java SDK.

Prerequisite

Steps to Change Password of PDF using Java REST Interface

  1. Import the required classes from the API for changing the password
  2. Create the PdfApi object by passing the secret key and client ID
  3. Read the source PDF file into a memory stream and upload it to the Cloud storage
  4. Create Base64 strings for the old password, new user password, and new owner password
  5. Call the PostChangePasswordDocumentInStorage operation to change the password by passing the necessary arguments
  6. Call the DownloadFile() method to download the PDF file with the new passwords
  7. Save the returned stream as a PDF file on local storage

These steps demonstrate how to change a PDF password online using a Java‑based API. Import the necessary classes, create a helper to convert strings to Base64, load the source PDF, upload it to cloud storage, generate Base64 strings for the old and new passwords, invoke PostChangePasswordDocumentInStorage() with the file name and passwords, and finally write the resulting stream to disk as a PDF.

Code to Change Password of PDF File using Java RESTful Service

Use the above code to change the password on an Adobe PDF using the Java REST API. The input PDF must be password‑protected, and you must know the existing password; otherwise, the operation will fail.

To learn how to decrypt an encrypted PDF file, see the article Decrypt PDF using Java REST API.

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