Update Image signatures in document

GroupDocs.Signature provides ImageSignature class to manipulate barcode signatures location, size and textual content. 

Please be aware that update method modifies the same document that was passed to constructor of Signature class.

Here are the steps to update Barcode signature in the document with GroupDocs.Signature:

This example shows how to update Image signature that was found using  search method.

Signature signature = new Signature("sampleSigned.pdf");
try 
{
    ImageSearchOptions options = new ImageSearchOptions();

    // search for image signatures in document
    List<ImageSignature> signatures = signature.search(ImageSignature.class,options);
    if (signatures.size() > 0)
    {
        ImageSignature imageSignature = signatures.get(0);
        imageSignature.setLeft(100);
        imageSignature.setTop(100);
        boolean result = signature.update("sampleSigned-output.pdf",imageSignature);
        if (result)
        {
            System.out.print("Image signature at location " + imageSignature.getLeft() + "x" + imageSignature.getTop() + " and Size " + imageSignature.getSize() + " was updated in the document [" + fileName + ".");
        }
        else
        {
            System.out.print("Signature was not updated in the document! Signature at location " + imageSignature.getLeft() + "x" + imageSignature.getTop() + " and Size " + imageSignature.getSize() + " was not found!");
        }
    }
} catch (Exception e) {
    throw new GroupDocsSignatureException(e.getMessage());
}

More resources

Advanced Usage Topics

To learn more about document eSign features, please refer to the advanced usage section.

GitHub Examples 

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

Free Online App 

Along with full-featured .NET library we provide simple, but powerful free Apps.
You are welcome to eSign PDF, Word, Excel, PowerPoint documents with free to use online GroupDocs Signature App.