Stamps are a powerful tool in PDF documents that allow users to mark and annotate specific areas or sections of a PDF file. Often used for approval, review, or to indicate a specific status, stamps can greatly enhance collaboration and document management. In PDF, stamps can take various forms, such as a simple checkmark, a customized graphic, a date and time stamp, or even a signature. In this article, you will learn how to add image stamps and dynamic stamps to a PDF document in Python using Spire.PDF for Python.
Install Spire.PDF for Python
This scenario requires Spire.PDF for Python and plum-dispatch v1.7.4. They can be easily installed in your Windows through the following pip command.
pip install Spire.PDF
If you are unsure how to install, please refer to this tutorial: How to Install Spire.PDF for Python on Windows
Add an Image Stamp to PDF Documents in Python
Spire.PDF for Python offers the PdfRubberStampAnnotation class to represent a rubber stamp in a PDF document. In order to create the appearance of a rubber stamp, the PdfTemplate class is used. The PdfTemplate is a piece of canvas on which you can draw whatever information you want, such as text, images, date, and time.
Image stamps can include logos, signatures, watermarks, or any other custom graphics that you want to overlay onto your PDFs. The main steps to add an image stamp to PDF using Spire.PDF for Python are as follows.
- Create a PdfDocument object.
- Load a PDF file using PdfDocument.LoadFromFile() method.
- Load an image that you want to stamp on PDF using PdfImage.FromFile() method.
- Create a PdfTemplate object with the dimensions of the image.
- Draw the image on the template using PdfTemplate.Graphics.DrawImage() method.
- Create a PdfRubberStampAnnotation object, and set the template as its appearance.
- Add the stamp to a specific PDF page using PdfPageBase.AnnotationsWidget.Add() method.
- Save the document to a different file using PdfDocument.SaveToFile() method.
- Python
from spire.pdf.common import *
from spire.pdf import *
# Create a PdfDocument object
doc = PdfDocument()
# Load a PDF document
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\input.pdf")
# Get a specific page
page = doc.Pages[2]
# Load an image file
image = PdfImage.FromFile("C:\\Users\\Administrator\\Desktop\\secret.png")
# Get the width and height of the image
width = (float)(image.Width)
height = (float)(image.Height)
# Create a PdfTemplate object based on the size of the image
template = PdfTemplate(width, height, True)
# Draw image on the template
template.Graphics.DrawImage(image, 0.0, 0.0, width, height)
# Create a rubber stamp annotation, specifying its location and position
rect = RectangleF((float) (page.ActualSize.Width - width - 50), (float) (page.ActualSize.Height - height - 40), width, height)
stamp = PdfRubberStampAnnotation(rect)
# Create a PdfAppearance object
pdfAppearance = PdfAppearance(stamp)
# Set the template as the normal state of the appearance
pdfAppearance.Normal = template
# Apply the appearance to the stamp
stamp.Appearance = pdfAppearance
# Add the stamp annotation to PDF
page.AnnotationsWidget.Add(stamp)
# Save the file
doc.SaveToFile("output/ImageStamp.pdf")
doc.Close()
Add a Dynamic Stamp to PDF in Python
Unlike static stamps, dynamic stamps can contain variable information such as the date, time, or user input. The following are the steps to create a dynamic stamp in PDF using Spire.PDF for Python.
- Create a PdfDocument object.
- Load a PDF file using PdfDocument.LoadFromFile() method.
- Create a PdfTemplate object with desired size.
- Draw strings on the template using PdfTemplate.Graphics.DrawString() method.
- Create a PdfRubberStampAnnotation object, and set the template as its appearance.
- Add the stamp to a specific PDF page using PdfPageBase.AnnotationsWidget.Add() method.
- Save the document to a different file using PdfDocument.SaveToFile() method.
- Python
from spire.pdf.common import *
from spire.pdf import *
# Create a PdfDocument object
doc = PdfDocument()
# Load a PDF document
doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\input.pdf")
# Get a specific page
page = doc.Pages[2]
# Create a PdfTemplate object
template = PdfTemplate(220.0, 50.0, True)
# Create two fonts
font1 = PdfTrueTypeFont("Elephant", 16.0, 0, True)
font2 = PdfTrueTypeFont("Times New Roman", 10.0, 0, True)
# Create a solid brush and a gradient brush
solidBrush = PdfSolidBrush(PdfRGBColor(Color.get_Blue()))
rectangle1 = RectangleF(PointF(0.0, 0.0), template.Size)
linearGradientBrush = PdfLinearGradientBrush(rectangle1, PdfRGBColor(Color.get_White()), PdfRGBColor(Color.get_LightBlue()), PdfLinearGradientMode.Horizontal)
# Create a pen
pen = PdfPen(solidBrush)
# Create a rounded rectangle path
CornerRadius = 10.0
path = PdfPath()
path.AddArc(template.GetBounds().X, template.GetBounds().Y, CornerRadius, CornerRadius, 180.0, 90.0)
path.AddArc(template.GetBounds().X + template.Width - CornerRadius, template.GetBounds().Y, CornerRadius, CornerRadius, 270.0, 90.0)
path.AddArc(template.GetBounds().X + template.Width - CornerRadius, template.GetBounds().Y + template.Height - CornerRadius, CornerRadius, CornerRadius, 0.0, 90.0)
path.AddArc(template.GetBounds().X, template.GetBounds().Y + template.Height - CornerRadius, CornerRadius, CornerRadius, 90.0, 90.0)
path.AddLine(template.GetBounds().X, template.GetBounds().Y + template.Height - CornerRadius, template.GetBounds().X, template.GetBounds().Y + CornerRadius / 2)
# Draw path on the template
template.Graphics.DrawPath(pen, path)
template.Graphics.DrawPath(linearGradientBrush, path)
# Draw text on the template
string1 = "APPROVED\n"
string2 = "By Marketing Manager at " + DateTime.get_Now().ToString("HH:mm, MMM dd, yyyy")
template.Graphics.DrawString(string1, font1, solidBrush, PointF(5.0, 5.0))
template.Graphics.DrawString(string2, font2, solidBrush, PointF(2.0, 28.0))
# Create a rubber stamp, specifying its size and location
rectangle2 = RectangleF((float) (page.ActualSize.Width - 220.0 - 50.0), (float) (page.ActualSize.Height - 50.0 - 100.0), 220.0, 50.0)
stamp = PdfRubberStampAnnotation(rectangle2)
# Create a PdfAppearance object and apply the template as its normal state
apprearance = PdfAppearance(stamp)
apprearance.Normal = template
# Apply the appearance to stamp
stamp.Appearance = apprearance
# Add the stamp annotation to annotation collection
page.AnnotationsWidget.Add(stamp)
# Save the file
doc.SaveToFile("output/DynamicStamp.pdf", FileFormat.PDF)
doc.Dispose()
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