Delete Digital signatures from documents Leave feedback

GroupDocs.Signature provides DigitalSignature class to manipulate digital electronic signatures and delete them from the documents. Please be aware that delete method modifies the same document that was passed to constructor of the Signature class.

Important information. Please be aware that digitally signed documents with valid certificates (pfx files) are secured and verified. Changing digitally signed document makes them untrusted from the digital verification perspective. At this moment only Pdf documents support deletion of the specific digital signatures in case of many ones were added. Most documents support deletion of all digital signatures at once without separate certificates removal. It’s strongly recommened to use deletion of electronic digital signatures by signature type Digital. See example [Delete Signatures of the certain type]

Here are the steps to delete Digital signature from the document with GroupDocs.Signature:

• Create new instance of Signature class and pass source document path or its stream as a constructor parameter;
• Instantiate DigitalSearchOptions object with desired properties;
• Call search method to obtain list of DigitalSignatures;
• Select from list DigitalSignature object(s) that should be removed from the document;
• Call Signature object [delete](https://reference.groupdocs.com/signature/java/com.groupdocs.signature/Signature#delete(java.lang.String,%20com.groupdocs.signature.domain.signatures.BaseSignature) method and pass one or several signatures to it.

This example shows how to delete Digital signature that was found using search method.

final Signature signature = new Signature(outputFilePath);
List<DigitalSignature> signatures = signature.search(DigitalSignature.class, SignatureType.Digital);
if (signatures.size() > 0)
{
	// delete signature
	DigitalSignature digitalSignature = signatures[0];
	boolean deleteResult = signature.delete(new ByteArrayOutputStream(), digitalSignature);	
	if (deleteResult)
	{
				System.out.print("Digital signature #"+digitalSignature.getThumbprint()+" from the "+digitalSignature.getSignTime()+" was deleted from document ['"+fileName+"'].");
	}
	else
	{
		System.out.print("Signature was not deleted from the document! Signature# "+digitalSignature.getThumbprint()+" was not found!");
	}
}

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

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 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 full-featured .java 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.