This short guide explains how to resize images in PDF using C#. It has details to set the IDE, a list of steps, and a sample code for developing a PDF photo resizer in C#. You will learn to access a specific image in a PDF and replace it with the resized image.

Steps to Resize PDF Picture using C#

1. Set the environment to use Aspose.PDF for .NET to resize images in a PDF
2. Apply the license in the application to exercise all the features without any limitations
3. Load the source PDF file into the Document object and access its first page
4. Use the ImagePlacementAbsorber class to scan all the images in the selected page
5. Select an image from the collection and save it to the memory stream
6. Remove the original image from the page by hiding its placement
7. Create an object of the ImageStamp class using the new image size as per the requirements
8. Save the new image in the PDF page at the same place as the original image
9. Save the PDF with the resized image in it

These steps describe how to reduce image size in PDF using C#. Load the source PDF file, access the target page, get the collection of images, select the desired image, save it to a memory stream, and remove the original image placement from the page. Create a new ImageStamp with the given source, reduce the size, save the image to the same location on the page, and save the PDF with the resized image.

Code to Resize PDF Photo using C#

This code has demonstrated the process to change image size in PDF using C#. You may resize all the images in the PDF, make the resize factor configurable, and add bounds checking so that the new image does not go beyond the page range. You can also change the image format to control the image size in the PDF and add error handling if required.

This article has taught us the process of changing the image size in a PDF. For adding JavaScript in a PDF, refer to the article Add JavaScript to PDF using C#.