Change PDF Page Size in C# Using Aspose.PDF for .NET

change-pdf-page-size-in-csharp.md

Learn how to Change PDF Page Size in C# Using Aspose.PDF for .NET

change-pdf-page-size-in-csharp_method_1.cs

// Step 1: Import Aspose.PDF
using Aspose.Pdf;  

// Step 2: Load the PDF document
Document document = new Document("input.pdf");

// Step 3: Resize pages to A3 using PageSize enum
foreach (Page page in document.Pages)
{
    page.Resize(PageSize.A3);
}

// Step 4: Save the output
document.Save("output_a3.pdf");

change-pdf-page-size-in-csharp_method_2.cs

// Step 1: Import the Aspose.PDF namespace
using Aspose.Pdf;

// Step 2: Load the PDF document
Document document = new Document("input.pdf");

// Step 3: Define custom dimensions (e.g., Letter size)
double newWidth = 612;  // 8.5 inches
double newHeight = 792; // 11 inches

// Step 4: Loop through each page and apply the new size
foreach (Page page in document.Pages)
{
    page.SetPageSize(newWidth, newHeight);
}

// Step 5: Save the resized document
document.Save("output_custom_size.pdf");