Signer.SaveDocument("SignedDocument.pdf", santuzzaSignature) SantuzzaSignature.CertificationLevel = PdfCertificationLevel.FillFormsAndAnnotate
Var santuzzaSignature = new PdfSignatureBuilder(pkcs7Signature, signedFields) Apply a new signature to this form field: Signer.ClearSignatureField(signedFields) Var signedFields = signer.GetSignatureFieldNames(false) Pkcs7Signer pkcs7Signature = new Pkcs7Signer("Signing Documents//certificate.pfx", "123",
#Remove pdf signature free how to
The code sample below shows how to retrieve signed form field names and apply a new signature to the first field: Use the GetSignatureFieldNames method to retrieve signed field names.Ĭall the PdfDocumentSigner.ClearSignatureFields() method to clear all signature fields. Call the PdfDocumentSigner.ClearSignatureField method with the form field’s name passed as a parameter. You can remove a signature from a form field and sign it with another signature. View Example: How to use a custom signer class to apply signatures to the PDF Document Re-Sign the Form Field If you need to calculate a document hash in a custom manner, you can use a custom digest calculator instead of DigestCalculator with a custom PKCS#7 signature builder: View Example: How to use Azure Key Vault API to sign a PDF document You can create the Pkcs7SignerBase descendant and use a custom PKCS#7 signature builder: Signer.SaveDocument("SignedDocument.pdf", signatures) SantuzzaSignature.Name = "Santuzza Valentina"
SantuzzaSignature.Location = "Australia" SantuzzaSignature.SetImageData(File.ReadAllBytes("Signing Documents//SantuzzaValentina.jpg")) Var santuzzaSignature = new PdfSignatureBuilder(pkcs7Signature, "Sign") Apply a signature to an existing form field: Specify an image and signer information:ĬooperSignature.SetImageData(File.ReadAllBytes("Signing Documents//JaneCooper.jpg")) ĬooperSignature.Reason = "Acknowledgement" Var cooperSignature = new PdfSignatureBuilder(pkcs7Signature, signatureFieldInfo) Apply a signature to a newly created signature field: Pkcs7Signer pkcs7Signature = new Pkcs7Signer("Signing Documents/certificate.pfx", "123", Using (var signer = new PdfDocumentSigner("Document.pdf")) View Example: How to Apply Multiple Signatures The code sample below applies a digital signature to a new and existing form field and signs a document with these signatures: Refer to the previous section for a code sample.Īpplies the signature(s) and saves the document. Use the PdfSignatureFieldInfo object to create a new form field. If the field with the specified name does not exist, a System.ArgumentException is thrown. Specify the signature field’s name in the object’s constructor to sign this field. Use the HashAlgorithmType enumeration to specify the signatures hashing algorithm.Īpplies a signature to a form field.
#Remove pdf signature free password
Specify the signature certificate and password in the object’s constructor. Pass the document to sign to the object’s constructor.Ĭreates a PKCS#7 signature. The table below lists API used to sign a form field: API The PdfDocumentSigner class allows you to sign and save a document. The PDF Document API supports PKCS#7 signatures with X.509 certificates and document-level time timestamps. Use the PdfSignatureBuilder class to apply a signature to the form field. SignatureFieldInfo.RotationAngle = PdfAcroFormFieldRotation.Rotate90 SignatureFieldInfo.SignatureBounds = New PdfRectangle(10, 10, 150, 150) SignatureFieldInfo.Name = "SignatureField" ' Specify the field's name, location and rotation angle: ' Create a signature field on the first page:ĭim signatureFieldInfo = New PdfSignatureFieldInfo(1) SignatureFieldInfo.SignatureBounds = new PdfRectangle(10, 10, 150, 150) Specify the field's name, location and rotation angle: Var signatureFieldInfo = new PdfSignatureFieldInfo(1) Create a signature field on the first page:
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