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PDF Signature Page Location

See more PDF Signatures Examples

This example demonstrates how to specify the location of a PDF signature on a page.

Note: This example requires Chilkat v9.5.0.85 or greater.

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Local $bSuccess = False

; This example requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

$oPdf = ObjCreate("Chilkat.Pdf")

; Load a PDF to be signed.
; The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
$bSuccess = $oPdf.LoadFile("qa_data/pdf/hello.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

; Options for signing are specified in JSON.
$oJson = ObjCreate("Chilkat.JsonObject")

; In most cases, the signingCertificateV2 and signingTime attributes are required.
$oJson.UpdateInt("signingCertificateV2",1)
$oJson.UpdateInt("signingTime",1)

; When cryptographically signing a PDF, the signature's appearance can be placed on a specific
; page in the PDF document, and at a specified location on the page.
; The 1st page of the PDF document is page number 1 (we don't use 0-based numbering for PDF page numbers).
; The PDF object has a NumPages property, so we can use it to sign on the last page of the PDF.
$oJson.UpdateInt("page",$oPdf.NumPages)

; appearance.y and appearance.x JSON properties control the x,y location of the signature.
; The "appearance.y" can be "top" or "bottom".
; The "appearance.x" can be "left", "middle", or "right".
; It is also possible to specify exact PDF location in user space coordinates, which is discussed below.
$oJson.UpdateString("appearance.y","bottom")
$oJson.UpdateString("appearance.x","middle")

; In this example, the fontScale (in combination with the number of appearance text lines and the length of the longest text line),
; automatically determine the width/height of the signature text box. Any included graphic (JPG image or built-in SVG) is automatically
; scaled to fit. It is alternatively possible to specify the desired width/height of the signature rectangle.  In that case
; you would NOT specify a fontScale because Chilkat would automatically chose a font scale to fit the text to the desired rectangle.
; This example demonstrates how to specify the exact width/height of the PDF signature text box.
$oJson.UpdateString("appearance.fontScale","9.0")

$oJson.UpdateString("appearance.text[0]","Digitally signed by: cert_cn")
$oJson.UpdateString("appearance.text[1]","current_dt")
$oJson.UpdateString("appearance.image","document-accepted")
$oJson.UpdateString("appearance.imagePlacement","left")
$oJson.UpdateString("appearance.imageOpacity","100")

; Load the signing certificate. (Use your own certificate.)
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","pfx_password")
If ($bSuccess = False) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

; Tell the pdf object to use the certificate for signing.
$bSuccess = $oPdf.SetSigningCert($oCert)
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

$bSuccess = $oPdf.SignPdf($oJson,"qa_output/hello_signed.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("The PDF has been successfully cryptographically signed." & @CRLF)

; The appearance of the signature appears in Adobe Acrobat as shown here:

; ----------------------------------------------------------------------------------------------------
; *** Scroll down for information about specifying the PDF signature x,y location in user space coordinates.
; ----------------------------------------------------------------------------------------------------

; (image:https://example-code.com/images/bottom_middle_signature.jpg/endImage)

; The x,y coordinates of a PDF page are in "user space", called "points", and there are 72 pointes per inch.
; A PDF page (8.5" x 11") is 612 points wide and 792 points high.
; The bottom left is at 0,0.    The top right is at 612,792.
; 
; To specify the location of a signature rectangle, the "appearance.y" is the y coordinate of the top of the signature rectangle,
; and the "appearance.x" is the x coordinate of the left of the signature rectangle.
; Therefore, to position the signature rectangle at the exact top/left of the page, we do this:

$oJson.UpdateString("appearance.y","792")
$oJson.UpdateString("appearance.x","0")

$oJson.UpdateString("appearance.text[0]","Digitally signed again by: cert_cn")
$oJson.UpdateString("appearance.text[1]","current_dt")
$oJson.UpdateString("appearance.image","document-accepted")
$oJson.UpdateString("appearance.imagePlacement","right")

$oPdf2 = ObjCreate("Chilkat.Pdf")
$bSuccess = $oPdf2.LoadFile("qa_output/hello_signed.pdf")
$bSuccess = $oPdf2.SetSigningCert($oCert)

$bSuccess = $oPdf2.SignPdf($oJson,"qa_output/hello_signed2.pdf")
If ($bSuccess = False) Then
    ConsoleWrite($oPdf2.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("The PDF has been successfully cryptographically signed again." & @CRLF)

; Here we have the PDF with the signature just added at the exact top/left.
; (image:https://example-code.com/images/pdf_signature_top_left.jpg/endImage)