Rotate PDF pages in C#

Turn pages clockwise by 90, 180 or 270 degrees.

Short answer

Call Rotate on a page with a multiple of 90. The rotation adds to the page’s current one and viewers apply it when they display the page; the content itself is not rewritten. Rotation reads the result: 0, 90, 180 or 270.

recipe-rotate-pdf-pages.cs

#:package PdfNetStack@1.2.0
using PdfNetStack;

PdfDocument doc = PdfDocument.Open("report.pdf");
doc.Pages[0].Rotate(90);                      // clockwise, a multiple of 90
foreach (PdfPage page in doc.Pages.Skip(1))
{
    page.Rotate(180);
}
doc.Save("report-rotated.pdf");
Console.WriteLine(string.Join(", ", doc.Pages.Select(p => p.Rotation)));

dotnet add package PdfNetStack

Related

• Edit pages
• Command line: pdfnetstack rotate in.pdf out.pdf 90 2-4
• API: PdfPage