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.

using (Signature signature = new Signature("sampleSigned.pdf"))
    ImageSearchOptions options = new ImageSearchOptions();
    // search for image signatures in document
    List<ImageSignature> signatures = signature.Search<ImageSignature>(options);
    if(signatures.Count > 0)
        ImageSignature imageSignature = signatures[0];
        // change Image properties
        signatureToUpdate.Top = 200;
        signatureToUpdate.Left = 200;
        signatureToUpdate.Width = 300;
        signatureToUpdate.Height = 150;

        bool result = signature.Update(imageSignature);
            Console.WriteLine($"Signature with Top '{imageSignature.Top}' was updated in the document ['{fileName}'].");
            Console.WriteLine($"Signature was not updated in  the document! Signature with Top '{imageSignature.Top}' was not found!");

Advanced Usage Topics

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

More resources

GitHub Examples

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

Free Online Apps

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

To generate image signatures and/or sign your files with them for free, you can use the Generate Image online app.

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