- Add a link to PDF with an external destination
- Add a link with an internal destination to PDF
- Add a note to PDF
- Add barcodes to PDF
- Add bookmarks to PDF
- Add footer to PDF
- Add simple html text to PDF
- Add hyperlink to PDF
- Add multiline text to a PDF document
- Add a rubber stamp annotation with a custom icon
- Add single-line text to PDF
- Add Stamp to PDF
- Add text field to PDF
- Add a Diagonal Watermark to PDF in C# - TallComponents - PDF Library
- Append two or more existing PDF files
- Change the color inside a PDF
- Change the formatting of a numeric field
- Change page orientation PDF
- Clip PDF page content in C#
- Convert PDF to plain text
- Convert SVG to PDF
- Create a text annotation in PDF with rich text
- Create formfields in PDF documents
- Create layers in PDF and draw on each layer
- Create a new digitally signed PDF document
- Create rectangles with rounded corners
- Create text with decorations
- How to create a tiling for shapes in PDF
- Crop content on a PDF page
- Determine the content bounding box
- Determine if a PDF only contains images
- Digitally sign a PDF form in C# or VB.NET
- Disable submit button after submitting
- How to downscale all images in a PDF
- Download and convert image to PDF
- How to downscale all images in a PDF
- Vector graphics in PDF
- How to embed files in a PDF document
- Embed TrueType font in PDF
- EMF to PDF as raster image - Code Sample C#
- EMF to PDF as vector image
- Export FDF from PDF form
- Extract embedded files from PDF
- Extract glyph boxes from PDF
- Extract glyphs and sort by reading order
- Extract graphics from PDF
- Extract images from PDF
- Fill in a PDF form using MVC
- Fill in a template PDF document
- Fill PDF form
- Fit image to PDF page
- Flatten Markup Annotation
- Flatten PDF form
- How to generate and export certificates
- How do I extract page destinations from bookmarks?
- Highlight fields in PDF
- How do I create graphics with Icc based colors
- How to add autosized text to PDF
- How to sign and verify updates to a PDF document
- Import FDF into PDF
- Merge PDF files in C# .NET
- How to mirror PDF pages and other shapes
- Layout text with MultilineTextShape
- Read and write meta data from PDF
- How to reduce PDF file size
- Remove graphics from PDF
- Remove PDF security settings
- Replace field with image
- Resize PDF pages
- Rotate a PDF page
- How to scale content of PDF
- Search text in PDF
- PDF Viewer Preferences
- Create a custom signature handler to sign and verify PDF documents
- Split PDF pages in C# and VB.NET
- TIFF to PDF C#
- Translate PDF page content
- Use multiple licenses
- Use TrueType font collections
- Verify a custom digital PDF signature
Digitally sign a PDF form in C# or VB.NET
Import a digital signature and sign a PDF.
Digital signatures can be used for many types of documents where traditional hand written signatures were used in the past. This code sample shows you how you can import a digital signature and use it to sign a PDF document in C# or VB.NET.
using (FileStream inFile = new FileStream("f1040a.pdf", FileMode.Open, FileAccess.Read))
{
// open document with signature fioeld
Document document = new Document(inFile);
// retrieve signature field
SignatureField field = document.Fields["SignHere"] as SignatureField;
// open certicate store.
Pkcs12Store ks = null;
using (FileStream file = new FileStream("ChrisSharp.pfx", FileMode.Open, FileAccess.Read))
{
ks = new Pkcs12Store(file, "Sample");
}
// let the SignatureHandler factory decide which type should be used.
SignatureHandler handler = StandardSignatureHandler.Create(ks);
field.SignatureHandler = handler;
// set some optional info.
field.ContactInfo = "+31 (0)77 4748677";
field.Location = "The Netherlands";
field.Reason = "I fully agree!";
// optional code to set image:
// enumerate widgets
foreach (SignatureWidget widget in field.Widgets)
{
SignatureAppearance signedAppearance = new SignatureAppearance();
signedAppearance.Style = SignatureAppearanceStyle.ImageAndText;
signedAppearance.Bitmap = new System.Drawing.Bitmap("logo.gif");
widget.SignedAppearance = signedAppearance;
widget.BackgroundColor = System.Drawing.Color.LightPink;
}
// write the modified document to disk
// note: signing requires read-write file access
using (FileStream outFile = new FileStream("signed.pdf", FileMode.Create, FileAccess.ReadWrite))
{
document.Write(outFile);
}
}
Sub Main()
Using inFile As New FileStream("f1040a.pdf", FileMode.Open, FileAccess.Read)
' open document with signature fioeld
Dim document As New Document(inFile)
' retrieve signature field
Dim field As SignatureField = TryCast(document.Fields("SignHere"), SignatureField)
' open certicate store.
Dim ks As Pkcs12Store = Nothing
Using file As New FileStream("..\..\../inputdocuments/ChrisSharp.pfx", FileMode.Open, FileAccess.Read)
ks = New Pkcs12Store(file, "Sample")
End Using
' let the SignatureHandler factory decide which type should be used.
Dim handler As SignatureHandler = StandardSignatureHandler.Create(ks)
field.SignatureHandler = handler
' set some optional info.
field.ContactInfo = "+31 (0)77 4748677"
field.Location = "The Netherlands"
field.Reason = "I fully agree!"
' optional code to set image:
' enumerate widgets
For Each widget As SignatureWidget In field.Widgets
Dim signedAppearance As New SignatureAppearance()
signedAppearance.Style = SignatureAppearanceStyle.ImageAndText
signedAppearance.Bitmap = New System.Drawing.Bitmap("..\..\../inputdocuments/logo_pdfkit.gif")
widget.SignedAppearance = signedAppearance
widget.BackgroundColor = System.Drawing.Color.LightPink
Next
' write the modified document to disk
' note: signing requires read-write file access
Using outFile As New FileStream("..\..\signed.pdf", FileMode.Create, FileAccess.ReadWrite)
document.Write(outFile)
End Using
End Using
End Sub
The signature field in the PDF now looks like this: