How to Migrate from PdfiumViewer to IronPDF in C#

Understanding PdfiumViewer

PdfiumViewer (NuGet package PdfiumViewer, repo pvginkel/PdfiumViewer, Apache 2.0) is a .NET wrapper around Google's PDFium rendering engine — the same engine used inside Chrome — exposing PDF viewing and rasterization for Windows Forms applications.

PdfiumViewer is a viewer and renderer, not a generator. It does not support PDF creation, editing, or manipulation, and its text API (PdfDocument.GetPdfText(int page)) returns raw page text without layout or per-word coordinates. The upstream repository was archived by its maintainer on August 2, 2019 and the last NuGet release (2.13.0) shipped on November 6, 2017 — existing code keeps working, but there are no further fixes, .NET 6+ updates, or CVE patches coming.

Critical PdfiumViewer Limitations

1. Viewer / renderer only: Cannot create PDFs from HTML, images, or programmatically. PdfiumViewer's capabilities are limited to viewing and rasterization — it does not support PDF creation, editing, merging, or other manipulative functions.

2. Windows Forms / Windows only: Built around System.Drawing and WinForms controls; not designed for other UI frameworks, and System.Drawing.Common is Windows-only on .NET 6+.

3. No PDF manipulation: Cannot merge, split, or modify PDF content.

4. Native binary dependencies: Requires platform-specific PDFium binaries via PdfiumViewer.Native.x86.v8-xfa and PdfiumViewer.Native.x86_64.v8-xfa (or the no-V8 / no-XFA variants).

5. Archived upstream: Repo archived 2019-08-02; last NuGet release 2.13.0 (2017-11-06); no further updates.

6. Page-level text extraction only: PdfDocument.GetPdfText(int page) returns raw page text — no per-word coordinates, no layout reconstruction, and no OCR for image-only PDFs.

7. No HTML to PDF: PDFium does not parse HTML. To produce a PDF from HTML you need a separate generator (wkhtmltopdf, IronPDF, PuppeteerSharp, etc.) and can then load the result with PdfiumViewer for display or rasterization.

8. No headers/footers: Cannot add page numbers or repeating content.

9. No watermarks: Cannot stamp documents with overlays.

10. No security features: Cannot encrypt or password-protect PDFs.

PdfiumViewer vs IronPDF Comparison

For teams targeting modern .NET, IronPDF provides a comprehensive, actively maintained foundation that works across all .NET application types, eliminating the Windows Forms restriction and native binary complexity.

Prerequisites

1. .NET Environment: .NET Framework 4.6.2+ or .NET Core 3.1+ / .NET 5/6/7/8/9+
2. NuGet Access: Ability to install NuGet packages
3. IronPDF License: Obtain your license key from ironpdf.com

NuGet Package Changes

# Remove PdfiumViewer packages
dotnet remove package PdfiumViewer
dotnet remove package PdfiumViewer.Native.x86.v8-xfa
dotnet remove package PdfiumViewer.Native.x86_64.v8-xfa

# Install IronPDF
dotnet add package IronPdf

# Remove PdfiumViewer packages
dotnet remove package PdfiumViewer
dotnet remove package PdfiumViewer.Native.x86.v8-xfa
dotnet remove package PdfiumViewer.Native.x86_64.v8-xfa

# Install IronPDF
dotnet add package IronPdf

License Configuration

// Add at application startup (Program.cs or Startup.cs)
IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY";

// Add at application startup (Program.cs or Startup.cs)
IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY";

' Add at application startup (Program.vb or Startup.vb)
IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY"

Identify PdfiumViewer Usage

# Find PdfiumViewer usage
grep -r "PdfiumViewer\|PdfViewer\|PdfDocument\.Load" --include="*.cs" .

# Find native binary references
grep -r "pdfium\.dll\|Native\.x86\|Native\.x64" --include="*.csproj" .

# Find viewer control usage
grep -r "PdfViewer" --include="*.cs" --include="*.Designer.cs" .

# Find PdfiumViewer usage
grep -r "PdfiumViewer\|PdfViewer\|PdfDocument\.Load" --include="*.cs" .

# Find native binary references
grep -r "pdfium\.dll\|Native\.x86\|Native\.x64" --include="*.csproj" .

# Find viewer control usage
grep -r "PdfViewer" --include="*.cs" --include="*.Designer.cs" .

Namespace Changes

// PdfiumViewer
using PdfiumViewer;

// IronPDF
using IronPdf;
using IronPdf.Rendering;
using IronPdf.Editing;

// PdfiumViewer
using PdfiumViewer;

// IronPDF
using IronPdf;
using IronPdf.Rendering;
using IronPdf.Editing;

Imports PdfiumViewer

Imports IronPdf
Imports IronPdf.Rendering
Imports IronPdf.Editing

Core Class Mappings

Document Loading Mappings

Document Properties Mappings

Page Rendering Mappings

Saving Documents Mappings

New or Substantially Expanded Features vs PdfiumViewer

Example 1: Text Extraction from PDF

Before (PdfiumViewer):

// NuGet: Install-Package PdfiumViewer
//        Install-Package PdfiumViewer.Native.x86.v8-xfa
//        Install-Package PdfiumViewer.Native.x86_64.v8-xfa
using PdfiumViewer;
using System;
using System.Text;

string pdfPath = "document.pdf";

// PdfiumViewer exposes page-level text extraction via
// PdfDocument.GetPdfText(int page). It returns raw page text only —
// no layout, no per-word coordinates, no OCR for image-only pages.
using (var document = PdfDocument.Load(pdfPath))
{
    int pageCount = document.PageCount;
    Console.WriteLine($"Total pages: {pageCount}");

    var sb = new StringBuilder();
    for (int i = 0; i < pageCount; i++)
    {
        string pageText = document.GetPdfText(i);
        sb.AppendLine($"--- Page {i + 1} ---");
        sb.AppendLine(pageText);
    }

    Console.WriteLine(sb.ToString());
}

// NuGet: Install-Package PdfiumViewer
//        Install-Package PdfiumViewer.Native.x86.v8-xfa
//        Install-Package PdfiumViewer.Native.x86_64.v8-xfa
using PdfiumViewer;
using System;
using System.Text;

string pdfPath = "document.pdf";

// PdfiumViewer exposes page-level text extraction via
// PdfDocument.GetPdfText(int page). It returns raw page text only —
// no layout, no per-word coordinates, no OCR for image-only pages.
using (var document = PdfDocument.Load(pdfPath))
{
    int pageCount = document.PageCount;
    Console.WriteLine($"Total pages: {pageCount}");

    var sb = new StringBuilder();
    for (int i = 0; i < pageCount; i++)
    {
        string pageText = document.GetPdfText(i);
        sb.AppendLine($"--- Page {i + 1} ---");
        sb.AppendLine(pageText);
    }

    Console.WriteLine(sb.ToString());
}

Imports PdfiumViewer
Imports System
Imports System.Text

Dim pdfPath As String = "document.pdf"

' PdfiumViewer exposes page-level text extraction via
' PdfDocument.GetPdfText(int page). It returns raw page text only —
' no layout, no per-word coordinates, no OCR for image-only pages.
Using document As PdfDocument = PdfDocument.Load(pdfPath)
    Dim pageCount As Integer = document.PageCount
    Console.WriteLine($"Total pages: {pageCount}")

    Dim sb As New StringBuilder()
    For i As Integer = 0 To pageCount - 1
        Dim pageText As String = document.GetPdfText(i)
        sb.AppendLine($"--- Page {i + 1} ---")
        sb.AppendLine(pageText)
    Next

    Console.WriteLine(sb.ToString())
End Using

After (IronPDF):

// NuGet: Install-Package IronPdf
using IronPdf;
using System;

string pdfPath = "document.pdf";

// Open and extract text from PDF
PdfDocument pdf = PdfDocument.FromFile(pdfPath);

// Extract text from all pages
string allText = pdf.ExtractAllText();
Console.WriteLine("Extracted Text:");
Console.WriteLine(allText);

// Extract text from specific page
string pageText = pdf.ExtractTextFromPage(0);
Console.WriteLine($"\nFirst page text: {pageText}");

Console.WriteLine($"\nTotal pages: {pdf.PageCount}");

// NuGet: Install-Package IronPdf
using IronPdf;
using System;

string pdfPath = "document.pdf";

// Open and extract text from PDF
PdfDocument pdf = PdfDocument.FromFile(pdfPath);

// Extract text from all pages
string allText = pdf.ExtractAllText();
Console.WriteLine("Extracted Text:");
Console.WriteLine(allText);

// Extract text from specific page
string pageText = pdf.ExtractTextFromPage(0);
Console.WriteLine($"\nFirst page text: {pageText}");

Console.WriteLine($"\nTotal pages: {pdf.PageCount}");

Imports IronPdf
Imports System

Module Program
    Sub Main()
        Dim pdfPath As String = "document.pdf"

        ' Open and extract text from PDF
        Dim pdf As PdfDocument = PdfDocument.FromFile(pdfPath)

        ' Extract text from all pages
        Dim allText As String = pdf.ExtractAllText()
        Console.WriteLine("Extracted Text:")
        Console.WriteLine(allText)

        ' Extract text from specific page
        Dim pageText As String = pdf.ExtractTextFromPage(0)
        Console.WriteLine(vbCrLf & "First page text: " & pageText)

        Console.WriteLine(vbCrLf & "Total pages: " & pdf.PageCount)
    End Sub
End Module

PdfiumViewer's text API is PdfDocument.GetPdfText(int page) — page-level raw text only, no layout reconstruction, no per-word coordinates, and no OCR fallback for image-only PDFs. Anything beyond a flat-text dump requires either custom layout heuristics or a different library.

IronPDF provides whole-document extraction via ExtractAllText() and per-page extraction via ExtractTextFromPage(index) (or pdf.Pages[index].Text). See the text extraction documentation for additional options.

Example 2: HTML to PDF Conversion

Before (PdfiumViewer):

// NuGet: Install-Package PdfiumViewer
using PdfiumViewer;
using System;

// PdfiumViewer wraps Google's PDFium — a renderer, not a generator.
// PDFium does not parse HTML, so PdfiumViewer has no HTML-to-PDF path.
// To produce a PDF from HTML you need a separate generator (wkhtmltopdf,
// IronPDF, PuppeteerSharp, etc.), then load the result with PdfiumViewer
// for display or rasterization.

string htmlContent = "<h1>Hello World</h1><p>This is a test document.</p>";

// Pretend "output.pdf" was produced by another tool — load and render it.
string existingPdfPath = "output.pdf";
using (var document = PdfDocument.Load(existingPdfPath))
{
    Console.WriteLine($"Loaded PDF with {document.PageCount} page(s).");

    // PdfDocument.Render(int page, float dpiX, float dpiY, bool forPrinting)
    var image = document.Render(0, 300, 300, true);
    Console.WriteLine("Rendered page 1 at 300 DPI.");
}

// NuGet: Install-Package PdfiumViewer
using PdfiumViewer;
using System;

// PdfiumViewer wraps Google's PDFium — a renderer, not a generator.
// PDFium does not parse HTML, so PdfiumViewer has no HTML-to-PDF path.
// To produce a PDF from HTML you need a separate generator (wkhtmltopdf,
// IronPDF, PuppeteerSharp, etc.), then load the result with PdfiumViewer
// for display or rasterization.

string htmlContent = "<h1>Hello World</h1><p>This is a test document.</p>";

// Pretend "output.pdf" was produced by another tool — load and render it.
string existingPdfPath = "output.pdf";
using (var document = PdfDocument.Load(existingPdfPath))
{
    Console.WriteLine($"Loaded PDF with {document.PageCount} page(s).");

    // PdfDocument.Render(int page, float dpiX, float dpiY, bool forPrinting)
    var image = document.Render(0, 300, 300, true);
    Console.WriteLine("Rendered page 1 at 300 DPI.");
}

Imports PdfiumViewer
Imports System

' PdfiumViewer wraps Google's PDFium — a renderer, not a generator.
' PDFium does not parse HTML, so PdfiumViewer has no HTML-to-PDF path.
' To produce a PDF from HTML you need a separate generator (wkhtmltopdf,
' IronPDF, PuppeteerSharp, etc.), then load the result with PdfiumViewer
' for display or rasterization.

Dim htmlContent As String = "<h1>Hello World</h1><p>This is a test document.</p>"

' Pretend "output.pdf" was produced by another tool — load and render it.
Dim existingPdfPath As String = "output.pdf"
Using document As PdfDocument = PdfDocument.Load(existingPdfPath)
    Console.WriteLine($"Loaded PDF with {document.PageCount} page(s).")

    ' PdfDocument.Render(int page, float dpiX, float dpiY, bool forPrinting)
    Dim image = document.Render(0, 300, 300, True)
    Console.WriteLine("Rendered page 1 at 300 DPI.")
End Using

After (IronPDF):

// NuGet: Install-Package IronPdf
using IronPdf;
using System;

string htmlContent = "<h1>Hello World</h1><p>This is a test document.</p>";

// Create a PDF from HTML string
var renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf(htmlContent);

// Save the PDF
pdf.SaveAs("output.pdf");

Console.WriteLine("PDF created successfully!");

// NuGet: Install-Package IronPdf
using IronPdf;
using System;

string htmlContent = "<h1>Hello World</h1><p>This is a test document.</p>";

// Create a PDF from HTML string
var renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf(htmlContent);

// Save the PDF
pdf.SaveAs("output.pdf");

Console.WriteLine("PDF created successfully!");

Imports IronPdf
Imports System

Module Program
    Sub Main()
        Dim htmlContent As String = "<h1>Hello World</h1><p>This is a test document.</p>"

        ' Create a PDF from HTML string
        Dim renderer As New ChromePdfRenderer()
        Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(htmlContent)

        ' Save the PDF
        pdf.SaveAs("output.pdf")

        Console.WriteLine("PDF created successfully!")
    End Sub
End Module

This is the largest capability gap. PDFium does not parse HTML, so PdfiumViewer has no HTML-to-PDF path — you would generate the PDF with another tool first and then use PdfiumViewer to display or rasterize it.

IronPDF provides native HTML to PDF conversion through ChromePdfRenderer, which uses a Chromium engine internally for HTML, CSS, and JavaScript rendering. RenderHtmlAsPdf() converts HTML strings, RenderUrlAsPdf() captures URLs, and RenderHtmlFileAsPdf() reads HTML files. See the HTML to PDF documentation for comprehensive examples.

Example 3: PDF to Image Conversion

Before (PdfiumViewer):

// NuGet: Install-Package PdfiumViewer
using PdfiumViewer;
using System;
using System.Drawing;
using System.Drawing.Imaging;

string pdfPath = "document.pdf";
string outputImage = "page1.png";

// PDFiumViewer excels at rendering PDFs to images
using (var document = PdfDocument.Load(pdfPath))
{
    // Render first page at 300 DPI
    int dpi = 300;
    using (var image = document.Render(0, dpi, dpi, true))
    {
        // Save as PNG
        image.Save(outputImage, ImageFormat.Png);
        Console.WriteLine($"Page rendered to {outputImage}");
    }

    // Render all pages
    for (int i = 0; i < document.PageCount; i++)
    {
        using (var pageImage = document.Render(i, 150, 150, true))
        {
            pageImage.Save($"page_{i + 1}.png", ImageFormat.Png);
        }
    }
}

// NuGet: Install-Package PdfiumViewer
using PdfiumViewer;
using System;
using System.Drawing;
using System.Drawing.Imaging;

string pdfPath = "document.pdf";
string outputImage = "page1.png";

// PDFiumViewer excels at rendering PDFs to images
using (var document = PdfDocument.Load(pdfPath))
{
    // Render first page at 300 DPI
    int dpi = 300;
    using (var image = document.Render(0, dpi, dpi, true))
    {
        // Save as PNG
        image.Save(outputImage, ImageFormat.Png);
        Console.WriteLine($"Page rendered to {outputImage}");
    }

    // Render all pages
    for (int i = 0; i < document.PageCount; i++)
    {
        using (var pageImage = document.Render(i, 150, 150, true))
        {
            pageImage.Save($"page_{i + 1}.png", ImageFormat.Png);
        }
    }
}

Imports PdfiumViewer
Imports System
Imports System.Drawing
Imports System.Drawing.Imaging

Module Module1
    Sub Main()
        Dim pdfPath As String = "document.pdf"
        Dim outputImage As String = "page1.png"

        ' PDFiumViewer excels at rendering PDFs to images
        Using document = PdfDocument.Load(pdfPath)
            ' Render first page at 300 DPI
            Dim dpi As Integer = 300
            Using image = document.Render(0, dpi, dpi, True)
                ' Save as PNG
                image.Save(outputImage, ImageFormat.Png)
                Console.WriteLine($"Page rendered to {outputImage}")
            End Using

            ' Render all pages
            For i As Integer = 0 To document.PageCount - 1
                Using pageImage = document.Render(i, 150, 150, True)
                    pageImage.Save($"page_{i + 1}.png", ImageFormat.Png)
                End Using
            Next
        End Using
    End Sub
End Module

After (IronPDF):

// NuGet: Install-Package IronPdf
using IronPdf;
using System;
using System.Linq;

string pdfPath = "document.pdf";
string outputImage = "page1.png";

// Open PDF and convert to images
PdfDocument pdf = PdfDocument.FromFile(pdfPath);

// Convert first page to image
var firstPageImage = pdf.ToBitmap(0);
firstPageImage[0].Save(outputImage);
Console.WriteLine($"Page rendered to {outputImage}");

// Convert all pages to images
var allPageImages = pdf.ToBitmap();
for (int i = 0; i < allPageImages.Length; i++)
{
    allPageImages[i].Save($"page_{i + 1}.png");
    Console.WriteLine($"Saved page {i + 1}");
}

Console.WriteLine($"Total pages converted: {pdf.PageCount}");

// NuGet: Install-Package IronPdf
using IronPdf;
using System;
using System.Linq;

string pdfPath = "document.pdf";
string outputImage = "page1.png";

// Open PDF and convert to images
PdfDocument pdf = PdfDocument.FromFile(pdfPath);

// Convert first page to image
var firstPageImage = pdf.ToBitmap(0);
firstPageImage[0].Save(outputImage);
Console.WriteLine($"Page rendered to {outputImage}");

// Convert all pages to images
var allPageImages = pdf.ToBitmap();
for (int i = 0; i < allPageImages.Length; i++)
{
    allPageImages[i].Save($"page_{i + 1}.png");
    Console.WriteLine($"Saved page {i + 1}");
}

Console.WriteLine($"Total pages converted: {pdf.PageCount}");

Imports IronPdf
Imports System
Imports System.Linq

Module Module1
    Sub Main()
        Dim pdfPath As String = "document.pdf"
        Dim outputImage As String = "page1.png"

        ' Open PDF and convert to images
        Dim pdf As PdfDocument = PdfDocument.FromFile(pdfPath)

        ' Convert first page to image
        Dim firstPageImage = pdf.ToBitmap(0)
        firstPageImage(0).Save(outputImage)
        Console.WriteLine($"Page rendered to {outputImage}")

        ' Convert all pages to images
        Dim allPageImages = pdf.ToBitmap()
        For i As Integer = 0 To allPageImages.Length - 1
            allPageImages(i).Save($"page_{i + 1}.png")
            Console.WriteLine($"Saved page {i + 1}")
        Next

        Console.WriteLine($"Total pages converted: {pdf.PageCount}")
    End Sub
End Module

This is one area where PdfiumViewer excels—PDF rendering to images is its primary strength. Both libraries handle this task effectively, but with different patterns.

PdfiumViewer uses document.Render(pageIndex, dpiX, dpiY, forPrinting) with nested using statements for proper disposal. You need to import System.Drawing and System.Drawing.Imaging for the ImageFormat enum.

IronPDF uses pdf.ToBitmap(pageIndex) which returns a bitmap array. The pattern is simpler without nested disposal requirements. For batch operations, ToBitmap() without parameters returns all pages. You can also use RasterizeToImageFiles() for direct file output. See the PDF to image documentation for additional rendering options.

Before (PdfiumViewer) - Complex Deployment

MyApp/
├── bin/
│   ├── MyApp.dll
│   ├── PdfiumViewer.dll
│   ├── x86/
│   │   └── pdfium.dll
│   └── x64/
│       └── pdfium.dll

After (IronPDF) - Clean Deployment

MyApp/
├── bin/
│   ├── MyApp.dll
│   └── IronPdf.dll  # Everything included

Remove Native Binary References

# Delete native PDFium binaries
rm -rf x86/ x64/ runtimes/

# Remove from .csproj native package references
# <PackageReference Include="PdfiumViewer.Native.x86.v8-xfa" />
# <PackageReference Include="PdfiumViewer.Native.x64.v8-xfa" />

# Delete native PDFium binaries
rm -rf x86/ x64/ runtimes/

# Remove from .csproj native package references
# <PackageReference Include="PdfiumViewer.Native.x86.v8-xfa" />
# <PackageReference Include="PdfiumViewer.Native.x64.v8-xfa" />

No Built-in Viewer Control

IronPDF is backend-focused and does not include a visual PDF viewer control:

// PdfiumViewer: Built-in viewer control
pdfViewer.Document = document;

// IronPDF: Use external viewer or web-based approach
pdf.SaveAs(tempPath);
Process.Start(new ProcessStartInfo(tempPath) { UseShellExecute = true });

// PdfiumViewer: Built-in viewer control
pdfViewer.Document = document;

// IronPDF: Use external viewer or web-based approach
pdf.SaveAs(tempPath);
Process.Start(new ProcessStartInfo(tempPath) { UseShellExecute = true });

' PdfiumViewer: Built-in viewer control
pdfViewer.Document = document

' IronPDF: Use external viewer or web-based approach
pdf.SaveAs(tempPath)
Process.Start(New ProcessStartInfo(tempPath) With {.UseShellExecute = True})

For viewing needs, consider using Process.Start() to open in the default PDF viewer, a WebBrowser control with the PDF path, or third-party viewer controls like Syncfusion, DevExpress, or Telerik.

Document Loading Method Change

// PdfiumViewer
PdfDocument.Load(path)

// IronPDF
PdfDocument.FromFile(path)

// PdfiumViewer
PdfDocument.Load(path)

// IronPDF
PdfDocument.FromFile(path)

' PdfiumViewer
PdfDocument.Load(path)

' IronPDF
PdfDocument.FromFile(path)

Save Method Change

// PdfiumViewer
document.Save(path)

// IronPDF
pdf.SaveAs(path)

// PdfiumViewer
document.Save(path)

// IronPDF
pdf.SaveAs(path)

Render Method Change

// PdfiumViewer: Returns image with nested using
using (var image = document.Render(0, 150, 150, true))
{
    image.Save("page.png", ImageFormat.Png);
}

// IronPDF: Returns bitmap array
var images = pdf.ToBitmap(0);
images[0].Save("page.png");

// PdfiumViewer: Returns image with nested using
using (var image = document.Render(0, 150, 150, true))
{
    image.Save("page.png", ImageFormat.Png);
}

// IronPDF: Returns bitmap array
var images = pdf.ToBitmap(0);
images[0].Save("page.png");

Imports System.Drawing.Imaging

' PdfiumViewer: Returns image with nested using
Using image = document.Render(0, 150, 150, True)
    image.Save("page.png", ImageFormat.Png)
End Using

' IronPDF: Returns bitmap array
Dim images = pdf.ToBitmap(0)
images(0).Save("page.png")

Page Size Access Change

// PdfiumViewer
var size = document.PageSizes[index];
Console.WriteLine($"{size.Width} x {size.Height}");

// IronPDF
var page = pdf.Pages[index];
Console.WriteLine($"{page.Width} x {page.Height}");

// PdfiumViewer
var size = document.PageSizes[index];
Console.WriteLine($"{size.Width} x {size.Height}");

// IronPDF
var page = pdf.Pages[index];
Console.WriteLine($"{page.Width} x {page.Height}");

' PdfiumViewer
Dim size = document.PageSizes(index)
Console.WriteLine($"{size.Width} x {size.Height}")

' IronPDF
Dim page = pdf.Pages(index)
Console.WriteLine($"{page.Width} x {page.Height}")

Pre-Migration

• Identify all PdfiumViewer usage in codebase
• List WinForms using PdfViewer control
• Document current rendering DPI settings
• Check for native binary references
• Identify print functionality usage
• Plan viewer control replacement strategy
• Obtain IronPDF license key

Package Changes

• Remove PdfiumViewer NuGet package
• Remove PdfiumViewer.Native.x86.v8-xfa package
• Remove PdfiumViewer.Native.x86_64.v8-xfa package
• Delete native pdfium.dll binaries from x86/ and x64/ folders
• Install IronPdf NuGet package: dotnet add package IronPdf

Code Changes

• Add license key configuration at startup
• Replace PdfDocument.Load() with PdfDocument.FromFile()
• Replace document.Save() with pdf.SaveAs()
• Replace document.Render() with pdf.ToBitmap() or RasterizeToImageFiles()
• Replace document.PageSizes[i] with pdf.Pages[i].Width/Height
• Replace PdfViewer control with external viewer or Process.Start()
• Add new capabilities (text extraction, HTML to PDF, etc.)

Post-Migration

• Test rendering output quality
• Test printing functionality
• Test on target platforms
• Add new features (HTML to PDF, merging, watermarks, security)
• Update documentation