Remove Digital Signatures from Documents & Images in C# .NET

remove-barcode-signatures-from-pdf-in-net.cs

// Supported file formats: https://docs.groupdocs.com/signature/net/supported-document-formats/

using (Signature signature = new Signature("signed.pdf"))
{
    BarcodeSearchOptions options = new BarcodeSearchOptions();
    // search for Barcode signatures in document
    List<BarcodeSignature> signatures = signature.Search<BarcodeSignature>(options);
    if (signatures.Count > 0)
    {
        BarcodeSignature barcodeSignature = signatures[0];
        bool result = signature.Delete(barcodeSignature);
        if (result)
        {
            Console.WriteLine($"Signature with Barcode '{barcodeSignature.Text}' and encode type '{barcodeSignature.EncodeType.TypeName}' was deleted from document ['{fileName}'].");
        }
        else
        {
            Console.WriteLine($"Signature was not deleted from the document! Signature with Barcode '{barcodeSignature.Text}' and encode type '{barcodeSignature.EncodeType.TypeName}' was not found!");
        }
    }
}

remove-digital-signatures-from-documents-and-images-in-net.md

Remove Digital Signatures from Documents & Images in C# .NET

The below C# .NET code examples demonstrates how to remove electronic signatures types (barcode, text, image, qr-code) from digital documents and images without requiring any third party applications or Microsoft Office installed on the devices.

View a list of all supported document formats by Conholdate.Total for .NET.

APIs to Use

• GroupDocs.Signature for .NET: https://products.groupdocs.com/signature/net/

Installation

Download Conholdate.Total APIs from https://downloads.conholdate.com/total/net or install the whole package directly from NuGet https://www.nuget.org/packages/Conholdate.Total/ into your workplace.

More About .NET Documents Signature API

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remove-digital-signatures-from-pdf-in-net.cs

// Supported file formats: https://docs.groupdocs.com/signature/net/supported-document-formats/

using (Signature signature = new Signature("signed.pdf"))
{
    // search for electronic Digital signatures in the document
    List<DigitalSignature> signatures = signature.Search<DigitalSignature>(SignatureType.Digital);
    if (signatures.Count > 0)
    {
        DigitalSignature digitalSignature = signatures[0];
        bool result = signature.Delete(digitalSignature);
        if (result)
        {
            Console.WriteLine($"Digital signature #{digitalSignature.Thumbprint} from the {digitalSignature.SignTime.ToShortDateString()} was deleted.");
        }
        else
        {
            Helper.WriteError($"Signature was not deleted from the document! Signature# {digitalSignature.Thumbprint} was not found!");
        }
    }
}

remove-text-signatures-from-pdf-in-net.cs

// Supported file formats: https://docs.groupdocs.com/signature/net/supported-document-formats/

using (Signature signature = new Signature("signed.pdf"))
{
    TextSearchOptions options = new TextSearchOptions();
    // search for text signatures in document
    List<TextSignature> signatures = signature.Search<TextSignature>(options);
    if(signatures.Count > 0)
    {
        TextSignature textSignature = signatures[0];
        bool result = signature.Delete(textSignature);
        if(result)
        {
            Console.WriteLine($"Signature with Text '{textSignature.Text}' was deleted from document.");
        }
        else
        {
            Console.WriteLine($"Signature was not deleted from the document!");
        }
    }
}