eSign document with Stamp signature Leave feedback

A stamp signature is a special type of electronic signature that has the visual appearance of a round seal and its visual parameters can be set programmatically. Every stamp signature can have multiple “stamp lines” with custom text and different line thicknesses, colors, font weights and sizes. Here is an example of how a stamp signature created with GroupDocs.Siganture may look like:

GroupDocs.Signature provides the StampSignOptions class to specify different options for Stamp signature:

• Stamp type - Round or Square;
• Height and width in pixels;
• Alignment and position within the document page;
• and many more.

Each Stamp option contains inner and outer lines. Inner lines represent vertical lines inside the stamp, while outer lines represent circles (or rectangles based on stamp type) around the stamp with their own text, border settings, background etc.

Here are the steps to add a Stamp signature to a document with GroupDocs.Signature:

• Create a new instance of the Signature class and pass the source document path as a constructor parameter.
• Instantiate the StampSignOptions object according to your requirements and specify appropriate options.
• Call the Sign method of the Signature class instance and pass the StampSignOptions to it.

This example shows how to add a Stamp signature to a document.

  // The path to the documents directory.
  const filePath = Constants.SAMPLE_PDF; // Assuming Constants.SAMPLE_PDF is defined elsewhere
  const fileName = path.basename(filePath);

  const outputFilePath = path.join(Constants.OutputPath, 'SignWithStamp', fileName);
  const signature = new signatureLib.Signature(filePath);

  // Create stamp sign options
  const options = new signatureLib.StampSignOptions();

  // Set stamp signature position
  options.setLeft(100);
  options.setTop(100);

  // Setup first external line of Stamp
  const outerLine = new signatureLib.StampLine();
  outerLine.setText(" * European Union * European Union  * European Union  * European Union  * European Union  * ");
  outerLine.getFont().setSize(12);
  outerLine.setHeight(22);
  outerLine.setTextBottomIntent(6);
  //outerLine.setTextColor(Color.WHITE);
  //outerLine.setBackgroundColor(Color.BLUE);
  options.getOuterLines().add(outerLine);

  // Inner square lines - horizontal lines inside the rings
  const innerLine = new signatureLib.StampLine();
  innerLine.setText("John");
  //innerLine.setTextColor(Color.RED);
  const signFont = new signatureLib.SignatureFont();
  signFont.setSize(20);
  signFont.setBold(true);
  innerLine.setFont(signFont);
  innerLine.setHeight(40);
  options.getInnerLines().add(innerLine);

  // Sign document to file
  signature.sign(outputFilePath, options);
  console.log(`\nSource document signed successfully.\nFile saved at ${outputFilePath}`);

This guide explains how to apply stamp-based signatures to documents using GroupDocs.Signature . It covers the process of creating a stamp signature, customizing its appearance, and positioning it on the document. The signed document can then be saved with the stamp signature applied.

You may easily run the code above and see the feature in action in our GitHub examples:

• GroupDocs.Signature for .NET examples, plugins, and showcase
• GroupDocs.Signature Node.Js for Java examples, plugins, and showcase
• Document Signature for .NET MVC UI Example
• Document Signature for .NET App WebForms UI Example
• Document Signature for Java App Dropwizard UI Example
• Document Signature for Java Spring UI Example

Along with the full-featured .NET library, we provide simple but powerful free online apps.

To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.