Add Digital Signature to PDF using Java

Digital signature generation and verification using server-side Aspose.PDF for Java APIs. Native and high performance library

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How to Add Digital Signature to a PDF File Using Java Tool

In order to add digital signature, we’ll use Aspose.PDF for Java API which is a feature-rich, powerful and easy to use conversion API for Java platform. You can download its latest version directly from Maven and install it within your Maven-based project by adding the following configurations to the pom.xml.

Repository

<repository>
    <id>AsposeJavaAPI</id>
    <name>Aspose Java AP</name>
    <url>https://releases.aspose.com/java/repo/</url>
</repository>

Dependency

<dependency>
<groupId>com.aspose</groupId>
<artifactId>aspose-pdf</artifactId>
<version>version of aspose-pdf API</version>
</dependency>

Add Digitally Sign to PDF using Java

You need Aspose.PDF for Java to try the code in your environment.

  1. Load the PDF with an instance of Document.
  2. Load all the PDF files with full path.
  3. Set the style of text like font, font size, color etc.
  4. Save PDF file, You will get the document with signature inserted.
  5. To verify the validity of the signature use PdfFileSignature.VerifySigned() method.

Add Electronic Signature to a PDF File using - Java

This sample code shows how to Signature PDF Pages - Java

Input file:

File not added

Certificate file:

File not added

Output format:

Output file:

String inFile = DATA_DIR.resolve("DigitallySign.pdf").toString();
String outFile = DATA_DIR.resolve("DigitallySign_out.pdf").toString();
String pfxFile = DATA_DIR.resolve("test.pfx").toString();
Document pdfDocument = new Document(inFile);

PdfFileSignature signature = new PdfFileSignature(pdfDocument);

PKCS7 pkcs = new PKCS7(pfxFile, "Pa$$w0rd2020");
// Use PKCS7/PKCS7Detached
// objects
signature.sign(1, true, new java.awt.Rectangle(300, 100, 400, 200), pkcs);
// Save output PDF file
signature.save(outFile);
// Close the signature object
signature.close();
// Close the document
pdfDocument.close();