Resize PDF while maintaining aspect ratio

[bwhite_mlhc]

Hello,

I am using your instructions entitled "C#/VB.NET: Change PDF Page Size" to resize PDF’s to letter size paper:

That works great, but our problem is that the source PDF’s will be in various sizes (any size, unknown). We need to maintain the aspect ratio of the original PDF and resize it to fit on letter-size paper. Are you able to provide an example showing how to accomplish that?

This is in a .NET 8 class library project using Spire.PDF version 11.2.4

Thank you!

[bwhite_mlhc]

I have attached a sample that has the issue

[Nina.Tang]

Hi,

Thanks for your inquiry.
Please refer to the following code to meet your requirement. If it doesn't help, please provide more information to help us have a better understanding.

Code: Select all

//Load the original PDF document
PdfDocument originPdf = new PdfDocument();
originPdf.LoadFromFile("download.pdf");

//Create a new PDF document
PdfDocument newPdf = new PdfDocument();

//Loop through the pages in the original PDF
foreach (PdfPageBase page in originPdf.Pages)
{
    SizeF size = PdfPageSize.Letter;
    PdfPageBase newPage;
    if (page.Size.Width > page.Size.Height)
    {
        // Landscape
        newPage = newPdf.Pages.Add(new SizeF(size.Height, size.Width), new PdfMargins(0));
    }
    else {
        // Portrait 
        newPage = newPdf.Pages.Add(size, new PdfMargins(0));
    }

    //Create a PdfTextLayout instance
    PdfTextLayout layout = new PdfTextLayout();
    //Set text layout as one page (if not set the content will not scale to fit page size)
    layout.Layout = PdfLayoutType.OnePage;
    //Create templates based on the pages in the original PDF
    PdfTemplate template = page.CreateTemplate();
    //Draw the templates onto the pages in the new PDF
    template.Draw(newPage, new PointF(0, 0), layout);
}


Sincerely,
Nina
E-iceblue support team

[bwhite_mlhc]

That seems to work great, thank you Nina!

[Nina.Tang]

Hi,

You're welcome.
If you need assistance in the future, please feel free to write back.

Sincerely,
Nina
E-iceblue support team