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Use Python to Convert JPG/PNG to PDF (Including Merging)

In the digital age, the conversion and management of images and documents have become increasingly important. Especially when needing to merge multiple JPG or PNG images into a single PDF file, the Python programming language offers a simple and efficient solution. This article will introduce how to utilize the Spire.PDF for Python library to perform image conversion and merging operations.

1. Tool Preparation

Before starting, ensure that you have installed the Python environment and the Spire.PDF for Python library. You can install it using the following command:

pip install Spire.PDF
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Additionally, make sure you have the JPG or PNG images you want to convert and place them in a single folder.

2. Code Implementation

Below is sample code to convert JPG and PNG images to a PDF file:

from spire.pdf.common import *
from spire.pdf import *
import os

# Create PdfDocument object
doc = PdfDocument()

# Set page margins to 0
doc.PageSettings.SetMargins(0.0)

# Get the path of the folder containing images
path = "C:\\Users\\Administrator\\Desktop\\Images\\"
files = os.listdir(path)

# Traverse through the files in the folder
for root, dirs, files in os.walk(path):
    for file in files:

        # Load the specific image
        image = PdfImage.FromFile(os.path.join(root, file))

        # Get the width and height of the image
        width = image.PhysicalDimension.Width
        height = image.PhysicalDimension.Height

        # Add a page with the same size as the image
        page = doc.Pages.Add(SizeF(width, height))

        # Draw the image at the (0, 0) position on the page
        page.Canvas.DrawImage(image, 0.0, 0.0, width, height)

# Save the file
doc.SaveToFile("output/CombineImages.pdf")
doc.Dispose()
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3. Code Explanation

  • Import Libraries :

First, import the required spire.pdf and os libraries, the latter being used for file and directory operations.

  • Create PdfDocument Object :

Initialize a PDF document object using PdfDocument(), which can be further manipulated.

  • Set Page Margins :

Call the SetMargins(0.0) method to set the page margins to zero, allowing the image to fill the entire page.

  • Read Images :

Use os.listdir(path) to retrieve all files in the specified directory, and utilize os.walk to traverse through all files in that directory.

  • Load and Process Images :

For each file, load the image using PdfImage.FromFile() and obtain its width and height.

  • Add Page :

Create a page with the same size as the image using the doc.Pages.Add() method.

  • Draw Image :

Use page.Canvas.DrawImage() to draw the image at the specified position on the page.

  • Save PDF File :

Finally, call doc.SaveToFile() to save the merged PDF file to the specified path.

4. Conclusion

By using the Spire.PDF for Python library, we can easily merge multiple JPG or PNG images into a single PDF file. This method is not only simple and efficient but also performs excellently when handling a large number of images. Whether for work or personal projects, this automated image processing method can save a significant amount of time. I hope this article helps you better grasp the skills of image conversion and merging!

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