iText pdf library
Website search

Encrypting / Decrypting PDFs

These examples were written in answer to questions such as:

DecryptPdf.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/27867868/how-can-i-decrypt-a-pdf-document-with-the-owner-password
 */
package com.itextpdf.samples.sandbox.security;
 
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.ReaderProperties;
 
import java.io.File;
 
public class DecryptPdf {
    public static final String DEST = "./target/sandbox/security/decrypt_pdf.pdf";
    public static final String SRC = "./src/test/resources/pdfs/hello_encrypted.pdf";
 
    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new DecryptPdf().manipulatePdf(DEST);
    }
 
    protected void manipulatePdf(String dest) throws Exception {
        PdfReader reader = new PdfReader(SRC, new ReaderProperties().setPassword("World".getBytes()));
        PdfDocument pdfDoc = new PdfDocument(reader, new PdfWriter(DEST));
        System.out.println(new String(reader.computeUserPassword()));
        pdfDoc.close();
    }
}
DecryptPdf2.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/27867868/how-can-i-decrypt-a-pdf-document-with-the-owner-password
 */
package com.itextpdf.samples.sandbox.security;
 
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
 
import java.io.File;
 
public class DecryptPdf2 {
    public static final String DEST = "./target/sandbox/security/decrypt_pdf2.pdf";
    public static final String SRC = "./src/test/resources/pdfs/encrypt_pdf_without_user_password.pdf";
 
    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new DecryptPdf2().manipulatePdf(DEST);
    }
 
    protected void manipulatePdf(String dest) throws Exception {
        PdfReader reader = new PdfReader(SRC);
        reader.setUnethicalReading(true);
        PdfDocument pdfDoc = new PdfDocument(reader, new PdfWriter(DEST));
        pdfDoc.close();
    }
}
DecryptPdf3.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/27867868/how-can-i-decrypt-a-pdf-document-with-the-owner-password
 */
package com.itextpdf.samples.sandbox.security;
 
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
 
import java.io.File;
import java.io.IOException;
 
public class DecryptPdf3 {
    public static final String DEST = "./target/sandbox/security/decrypt_pdf3.pdf";
    public static final String SRC = "./src/test/resources/pdfs/encrypt_pdf_without_user_password.pdf";
 
    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new DecryptPdf3().manipulatePdf(DEST);
    }
 
    protected void manipulatePdf(String dest) throws Exception {
        MyReader reader = new MyReader(SRC);
        reader.setUnethicalReading(true);
        reader.decryptOnPurpose();
        PdfDocument pdfDoc = new PdfDocument(reader, new PdfWriter(DEST));
        pdfDoc.close();
        reader.close();
    }
 
 
    class MyReader extends PdfReader {
        public MyReader(String filename) throws IOException {
            super(filename);
        }
 
        public void decryptOnPurpose() {
            encrypted = false;
        }
    }
}
EncryptPdf.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/27867868/how-can-i-decrypt-a-pdf-document-with-the-owner-password
 */
package com.itextpdf.samples.sandbox.security;
 
import com.itextpdf.kernel.pdf.*;
import com.itextpdf.kernel.utils.CompareTool;
 
import org.junit.Assert;
 
import java.io.File;
 
public class EncryptPdf {
    public static final String DEST = "./target/sandbox/security/encrypt_pdf.pdf";
    public static final String SRC = "./src/test/resources/pdfs/hello_encrypted.pdf";
 
    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new EncryptPdf().manipulatePdf(DEST);
    }
 
    protected void manipulatePdf(String dest) throws Exception {
        PdfReader reader = new PdfReader(SRC, new ReaderProperties().setPassword("World".getBytes()));
        PdfWriter writer = new PdfWriter(DEST, new WriterProperties()
                .setStandardEncryption("Hello".getBytes(), "World".getBytes(), EncryptionConstants.ALLOW_PRINTING,
                        EncryptionConstants.ENCRYPTION_AES_128 | EncryptionConstants.DO_NOT_ENCRYPT_METADATA));
        PdfDocument pdfDoc = new PdfDocument(reader, writer);
        pdfDoc.close();
    }
}
EncryptPdfWithoutUserPassword.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/27867868/how-can-i-decrypt-a-pdf-document-with-the-owner-password
 */
package com.itextpdf.samples.sandbox.security;
 
import com.itextpdf.kernel.pdf.*;
 
import java.io.File;
 
public class EncryptPdfWithoutUserPassword {
    public static final String DEST = "./target/sandbox/security/encrypt_pdf_without_user_password.pdf";
    public static final String SRC = "./src/test/resources/pdfs/hello_encrypted.pdf";
 
    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new EncryptPdfWithoutUserPassword().manipulatePdf(DEST);
    }
 
    protected void manipulatePdf(String dest) throws Exception {
        PdfReader reader = new PdfReader(SRC, new ReaderProperties().setPassword("World".getBytes()));
        PdfWriter writer = new PdfWriter(DEST,
                new WriterProperties().setStandardEncryption(null, "World".getBytes(), EncryptionConstants.ALLOW_PRINTING,
                        EncryptionConstants.ENCRYPTION_AES_128 | EncryptionConstants.DO_NOT_ENCRYPT_METADATA));
        PdfDocument pdfDoc = new PdfDocument(reader, writer);
        pdfDoc.close();
    }
}

Click the following link to see the legacy example for iText 5. Except for security fixes, iText 5 is no longer being developed.



Contact

Still have questions? 

We're happy to answer your questions. Reach out to us and we'll get back to you shortly.

Contact us
Stay updated

Join 11,000+ subscribers and become an iText PDF expert by staying up to date with our new products, updates, tips, technical solutions and happenings.

Subscribe Now