import com.ironsoftware.ironpdf.*; import java.io.IOException; import java.nio.file.Paths; // Apply your license key License.setLicenseKey("YOUR-LICENSE-KEY"); // Set a log path Settings.setLogPath(Paths.get("C:/tmp/IronPdfEngine.log")); // Render the HTML as a PDF. Stored in myPdf as type PdfDocument; PdfDocument myPdf = PdfDocument.renderHtmlAsPdf("<h1> ~Hello World~ </h1> Made with IronPDF!"); // Save the PdfDocument to a file myPdf.saveAs(Paths.get("html_saved.pdf"));

USANDO IRONPDF PARA JAVA

Cómo Proteger con Contraseña un PDF en Java

Darrius Serrant

Actualizado:julio 28, 2025

This article will demonstrate how to use IronPDF to work with PDF documents and also protect new files with a user password.

IronPDF - Java PDF Library

IroqPDF Java PDF Library is a Java library for working with PDF documents. It provides a wide range of features for generating and manipulating PDFs, including the ability to add text, images, and other types of content, and control the layout and formatting of the document. It also provides a number of important features for securing PDF content, such as using password protection features in IronPDF.

Steps to Protect PDF using Password in Java Applications

Prerequisites for Project Setup

To use IronPDF to work with PDFs in a Java Maven project, you will need to make sure that you have the following prerequisites:

Java Development Kit (JDK): A running current version of Java must be installed on your computer. If you don't have JAR files, then download the latest JDK from the Oracle website.
Maven: Maven is an important build automation tool for Java projects which is required to manage the project and its dependencies. Download Maven or JAR file from the Apache Maven website if you don't have it installed.

IronPDF for Java Library: You will also require the IronPDF for Java library, which will be added to your Maven project as a dependency. This can be done by adding the following dependency to your project's pom.xml file. Maven will automatically download and install it in the project.

<dependency>
    <groupId>com.ironsoftware</groupId>
    <artifactId>ironpdf</artifactId>
    <version>YOUR_VERSION_HERE</version>
</dependency>

<dependency>
    <groupId>com.ironsoftware</groupId>
    <artifactId>ironpdf</artifactId>
    <version>YOUR_VERSION_HERE</version>
</dependency>

XML

Slf4j Dependency: Add the Slf4j dependency in the pom.xml file.

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>2.0.3</version>
</dependency>

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>2.0.3</version>
</dependency>

XML

Once you have set up your Java program with password protection capability for PDFs, you are ready to use IronPDF to protect a PDF file with password protection.

Important Steps Before Writing Code

First, import the necessary IronPDF classes into your Java code. Add the following code at the top of the "Main.java" file:

import com.ironsoftware.ironpdf.PdfDocument;
import com.ironsoftware.ironpdf.metadata.MetadataManager;
import com.ironsoftware.ironpdf.security.PdfPrintSecurity;
import com.ironsoftware.ironpdf.security.SecurityManager;
import com.ironsoftware.ironpdf.security.SecurityOptions;

import java.io.IOException;
import java.nio.file.Paths;
import java.util.Date;

import com.ironsoftware.ironpdf.PdfDocument;
import com.ironsoftware.ironpdf.metadata.MetadataManager;
import com.ironsoftware.ironpdf.security.PdfPrintSecurity;
import com.ironsoftware.ironpdf.security.SecurityManager;
import com.ironsoftware.ironpdf.security.SecurityOptions;

import java.io.IOException;
import java.nio.file.Paths;
import java.util.Date;

JAVA

Now, in the main method, enter your license key using the IronPDF setLicenseKey method.

// Set your IronPDF license key
License.setLicenseKey("Your license key");

// Set your IronPDF license key
License.setLicenseKey("Your license key");

JAVA

Open an Encrypted PDF Document

The following code snippet will open a document that was encrypted with the password "password":

// Load an encrypted PDF file using its password
PdfDocument pdf = PdfDocument.fromFile(Paths.get("encrypted.pdf"), "secretPassword");

// Load an encrypted PDF file using its password
PdfDocument pdf = PdfDocument.fromFile(Paths.get("encrypted.pdf"), "secretPassword");

JAVA

In the above code snippet, an encrypted PDF file is opened with the password "password".

How to Password Protect PDF in Java, Figure 1: Opening an Encrypted PDF document Opening an Encrypted PDF document

Encrypt PDF Document using Password Protection

Let's change the owner password of the "encrypted.pdf" file, which was opened in the previous step. The following code helps to achieve this task:

// Change or set the document owner password
SecurityManager securityManager = pdf.getSecurity();
// Remove existing passwords and encryption from the document
securityManager.removePasswordsAndEncryption();
// Set a new password for the document
securityManager.setPassword("secret-key");

// Change or set the document owner password
SecurityManager securityManager = pdf.getSecurity();
// Remove existing passwords and encryption from the document
securityManager.removePasswordsAndEncryption();
// Set a new password for the document
securityManager.setPassword("secret-key");

JAVA

The first step is to remove the password using the removePasswordsAndEncryption method, and then set a new password using the setPassword method.

Save Password Protected PDF Documents

Finally, save the PDF document with the following line of code:

// Save the secured PDF document
pdf.saveAs(Paths.get("assets/secured.pdf"));

// Save the secured PDF document
pdf.saveAs(Paths.get("assets/secured.pdf"));

JAVA

The output file is now opened with the "secret-key" password.

How to Password Protect PDF in Java, Figure 2: Newly-encrypted PDF Document Newly-encrypted PDF Document

Edit File Security Settings

Important security options can be set easily with IronPDF in Java using the SecurityOptions class. The code below makes the PDF read-only and disallows users from copying, pasting, and printing, and sets passwords for the owner and user.

// Configure security options for the PDF document
SecurityOptions securityOptions = new SecurityOptions();
securityOptions.setAllowUserCopyPasteContent(false);
securityOptions.setAllowUserAnnotations(false);
securityOptions.setAllowUserPrinting(PdfPrintSecurity.NO_PRINT);
securityOptions.setAllowUserFormData(false);

SecurityManager securityManager = pdf.getSecurity();
// Apply the specified security options to the PDF
securityManager.setSecurityOptions(securityOptions);

// Configure security options for the PDF document
SecurityOptions securityOptions = new SecurityOptions();
securityOptions.setAllowUserCopyPasteContent(false);
securityOptions.setAllowUserAnnotations(false);
securityOptions.setAllowUserPrinting(PdfPrintSecurity.NO_PRINT);
securityOptions.setAllowUserFormData(false);

SecurityManager securityManager = pdf.getSecurity();
// Apply the specified security options to the PDF
securityManager.setSecurityOptions(securityOptions);

JAVA

This will set all the necessary security options for the PDF document.

How to Password Protect PDF in Java, Figure 3: New PDF Security Settings New PDF Security Settings

Summary

This article explained how to open an existing PDF document and add password protection using the IronPDF Library for Java in Java. IronPDF makes it a lot easier to work with PDF files in Java. Whether you want to create a new document or make a PDF viewer, IronPDF helps to achieve this task with a single line of code. IronPDF's Engine is well suited for the Java programming language, as it is fast and memory efficient. With IronPDF, you can set a user password along with the owner password. It provides full protection options along with other features like converting to PDF from other formats with IronPDF, splitting documents with IronPDF, and merging documents with IronPDF.

IronPDF can be used for free in a free trial of IronPDF and can be licensed for commercial use with IronPDF. Its lite package starts from $799. Download IronPDF and give it a try.

Preguntas Frecuentes

¿Cómo puedo proteger con contraseña un documento PDF en Java?

Para proteger con contraseña un documento PDF en Java, puede utilizar la clase SecurityManager de IronPDF para establecer una contraseña de usuario. Esto implica inicializar un objeto PdfDocument, establecer la contraseña deseada con setPassword y luego guardar el archivo con el método saveAs.

¿Qué necesito para configurar un proyecto PDF en Java?

Para configurar un proyecto PDF usando IronPDF en Java, necesita el Kit de Desarrollo de Java (JDK), Maven para la gestión de dependencias, y debe incluir la biblioteca IronPDF en el archivo pom.xml de su proyecto.

¿Cómo se manipulan archivos PDF en Java?

Puede manipular archivos PDF en Java usando IronPDF al importar las clases necesarias como PdfDocument. Esto le permite editar contenido, combinar documentos y aplicar configuraciones de seguridad usando la clase SecurityOptions.

¿Cómo puedo restringir que un PDF se imprima usando Java?

Usando IronPDF, puede restringir la impresión de un PDF configurando la clase SecurityOptions. Establezca los permisos adecuados para deshabilitar acciones como la impresión, luego aplique estas configuraciones a su objeto PdfDocument.

¿Cuáles son los pasos para abrir un PDF encriptado en Java?

Para abrir un PDF encriptado en Java utilizando IronPDF, use el método PdfDocument.fromFile, proporcionando la ruta del archivo y la contraseña como parámetros para descifrar y acceder al documento.

¿Existe una versión gratuita de la biblioteca PDF disponible para Java?

IronPDF ofrece una versión de prueba gratuita que los desarrolladores pueden usar para explorar sus características. Para uso extendido o proyectos comerciales, se encuentra disponible una versión con licencia.

¿Cómo puedo cambiar la contraseña de un PDF existente en Java?

Para cambiar la contraseña de un PDF existente usando IronPDF, abra el documento con la contraseña actual, elimínela utilizando el SecurityManager y establezca una nueva contraseña antes de guardar el documento.

Darrius Serrant

Chatea con el equipo de ingeniería ahora

Ingeniero de Software Full Stack (WebOps)

Darrius Serrant tiene una licenciatura en Ciencias de la Computación de la Universidad de Miami y trabaja como Ingeniero de Marketing WebOps Full Stack en Iron Software. Atraído por la programación desde joven, vio la computación como algo misterioso y accesible, convirtiéndolo en el ...