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Wie man einen ASP.NET Core PDF-Viewer erstellt

Veröffentlicht:November 10, 2025

Building an ASP.NET Core PDF viewer shouldn't require complex JavaScript libraries or third-party browser plugins. Modern web applications need a reliable way to display PDF files directly in the browser, whether for invoices, reports, or interactive PDF documents. IronPDF simplifies this process by leveraging your browser's built-in PDF viewer capabilities while generating pixel-perfect PDFs on the server side.

In this article, we'll walk you through how to generate and view PDF documents within your ASP.NET Core projects, showing how to create PDF viewer applications that can display any PDF.

What Is an ASP.NET Core PDF Viewer?

An ASP.NET Core PDF viewer enables users to view PDF documents directly within web applications without downloading files to their device. Instead of wrestling with JavaScript-based document viewer components, IronPDF takes a refreshingly simple approach: it generates high-quality PDF files server-side using Chrome's rendering engine, then serves them with the correct headers so browsers automatically display PDF files inline.

This server-side approach means your ASP.NET Core PDF viewer works consistently across all browsers without additional plugins like Adobe Acrobat Reader. Since IronPDF uses the same Chrome engine that powers millions of browsers, your PDF documents render exactly as intended, preserving CSS styles, JavaScript interactions, and complex layouts. The ASP.NET Core PDF integration handles everything from HTML to PDF conversion to secure document delivery with long-term support.

How Do You Install IronPDF in Your Web Application?

Installing IronPDF in your .NET Core web application requires just one NuGet Package Manager command. Open your Package Manager Console in Visual Studio and run:

Install-Package IronPdf

After installation, configure IronPDF in your Program.cs file to set up your license key:

IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY"; // Start with a free trial key

IronPdf.License.LicenseKey = "YOUR-LICENSE-KEY"; // Start with a free trial key

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This simple setup gives you access to IronPDF's complete .NET Core PDF viewer functionality. The library automatically handles Chrome engine deployment and provides a clean API for generating and displaying PDF files in your ASP.NET Core applications.

How Can You Create a Basic PDF Document Viewer?

Creating your first ASP.NET Core PDF viewer requires minimal code. Here's a controller that converts HTML content into a viewable PDF document:

using IronPdf;
using Microsoft.AspNetCore.Mvc;

public class PdfController : Controller
{
    public IActionResult ViewDocument()
    {
        var renderer = new ChromePdfRenderer();

        // Create PDF from HTML string
        var html = @"
            <html>
                <body style='font-family: Arial; padding: 20px;'>
                    <h1>Invoice #2024-001</h1>
                    <p>This PDF document is displayed directly in your browser.</p>
                    <table style='width: 100%; border-collapse: collapse;'>
                        <tr>
                            <td style='border: 1px solid #ddd; padding: 8px;'>Item</td>
                            <td style='border: 1px solid #ddd; padding: 8px;'>Price</td>
                        </tr>
                        <tr>
                            <td style='border: 1px solid #ddd; padding: 8px;'>Service</td>
                            <td style='border: 1px solid #ddd; padding: 8px;'>$99.00</td>
                        </tr>
                    </table>
                </body>
            </html>";
        var pdf = renderer.RenderHtmlAsPdf(html);

        // Return PDF for inline viewing
        Response.Headers.Add("Content-Disposition", "inline; filename=invoice.pdf");
        return File(pdf.BinaryData, "application/pdf");
    }
}

using IronPdf;
using Microsoft.AspNetCore.Mvc;

public class PdfController : Controller
{
    public IActionResult ViewDocument()
    {
        var renderer = new ChromePdfRenderer();

        // Create PDF from HTML string
        var html = @"
            <html>
                <body style='font-family: Arial; padding: 20px;'>
                    <h1>Invoice #2024-001</h1>
                    <p>This PDF document is displayed directly in your browser.</p>
                    <table style='width: 100%; border-collapse: collapse;'>
                        <tr>
                            <td style='border: 1px solid #ddd; padding: 8px;'>Item</td>
                            <td style='border: 1px solid #ddd; padding: 8px;'>Price</td>
                        </tr>
                        <tr>
                            <td style='border: 1px solid #ddd; padding: 8px;'>Service</td>
                            <td style='border: 1px solid #ddd; padding: 8px;'>$99.00</td>
                        </tr>
                    </table>
                </body>
            </html>";
        var pdf = renderer.RenderHtmlAsPdf(html);

        // Return PDF for inline viewing
        Response.Headers.Add("Content-Disposition", "inline; filename=invoice.pdf");
        return File(pdf.BinaryData, "application/pdf");
    }
}

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The ChromePdfRenderer class handles the conversion processing, transforming your HTML into a PDF document. Setting the Content-Disposition header to "inline" tells the browser to display the PDF rather than download it, creating a seamless PDF viewer experience where users can view PDF files directly in their web application.

Output PDF Document in Browser Viewer

How to Create an ASP.NET Core PDF Viewer: Figure 1 - PDF in our browser PDF viewer

How Do You Display PDF Files from Different Sources?

Your ASP.NET Core PDF viewer can generate PDF files from multiple package sources. Here's how to convert a URL into a viewable PDF:

public IActionResult ViewFromUrl(string websiteUrl)
{
    var renderer = new ChromePdfRenderer();

    // Configure rendering options
    renderer.RenderingOptions.EnableJavaScript = true;
    renderer.RenderingOptions.WaitFor.RenderDelay = 2000; // Wait for content to load
    var pdf = renderer.RenderUrlAsPdf(websiteUrl);
    Response.Headers.Add("Content-Disposition", "inline");
    return File(pdf.BinaryData, "application/pdf");
}

public IActionResult ViewFromUrl(string websiteUrl)
{
    var renderer = new ChromePdfRenderer();

    // Configure rendering options
    renderer.RenderingOptions.EnableJavaScript = true;
    renderer.RenderingOptions.WaitFor.RenderDelay = 2000; // Wait for content to load
    var pdf = renderer.RenderUrlAsPdf(websiteUrl);
    Response.Headers.Add("Content-Disposition", "inline");
    return File(pdf.BinaryData, "application/pdf");
}

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Output

How to Create an ASP.NET Core PDF Viewer: Figure 2 - PDF rendered from URL and displayed in our PDF viewer program

For existing PDF files stored on the server, you can load and display them easily. This sample code shows how to work with files in your wwwroot folder:

public IActionResult ViewExistingPdf(string fileName)
{
    // Load PDF from wwwroot folder
    var pdfPath = Path.Combine(_webHostEnvironment.WebRootPath, "documents", fileName);
    var pdf = PdfDocument.FromFile(pdfPath);   
    // Optional: Add modifications like watermarks
    pdf.ApplyWatermark("<h2 style='color: red; opacity: 0.5;'>CONFIDENTIAL</h2>");
    return File(pdf.BinaryData, "application/pdf");
}

public IActionResult ViewExistingPdf(string fileName)
{
    // Load PDF from wwwroot folder
    var pdfPath = Path.Combine(_webHostEnvironment.WebRootPath, "documents", fileName);
    var pdf = PdfDocument.FromFile(pdfPath);   
    // Optional: Add modifications like watermarks
    pdf.ApplyWatermark("<h2 style='color: red; opacity: 0.5;'>CONFIDENTIAL</h2>");
    return File(pdf.BinaryData, "application/pdf");
}

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How to Create an ASP.NET Core PDF Viewer: Figure 3 - Viewing an Existing PDF (With our added watermark)

This flexibility means your PDF viewer can handle both dynamically generated content and existing PDF documents stored in your wwwroot folder or database. The component seamlessly integrates with your ASP.NET Core architecture.

How Can You Add Advanced PDF Viewer Features?

IronPDF transforms your basic PDF viewer into a powerful document viewer with advanced capabilities. Adding forms to your PDF files enables interactive functionality that users can fill directly:

public IActionResult CreateFormPdf()
{
    var html = @"
        <html>
            <body>
                <h2>Application Form</h2>
                <form>
                    Name: 
                    <br><br>
                    Email: 
                    <br><br>
                    <input type='checkbox'> I agree to terms
                </form>
            </body>
        </html>";
    var renderer = new ChromePdfRenderer();
    renderer.RenderingOptions.CreatePdfFormsFromHtml = true; // Enable form fields
    var pdf = renderer.RenderHtmlAsPdf(html);
    return File(pdf.BinaryData, "application/pdf");
}

public IActionResult CreateFormPdf()
{
    var html = @"
        <html>
            <body>
                <h2>Application Form</h2>
                <form>
                    Name: 
                    <br><br>
                    Email: 
                    <br><br>
                    <input type='checkbox'> I agree to terms
                </form>
            </body>
        </html>";
    var renderer = new ChromePdfRenderer();
    renderer.RenderingOptions.CreatePdfFormsFromHtml = true; // Enable form fields
    var pdf = renderer.RenderHtmlAsPdf(html);
    return File(pdf.BinaryData, "application/pdf");
}

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Output with Fillable Form

How to Create an ASP.NET Core PDF Viewer: Figure 4

When users open this PDF in their browser, they can fill out the forms directly without needing external tools. You can also edit PDF files by adding headers, footers, page numbers, or digital signatures. The tag helper approach makes it easy to add these features:

// Add headers and page numbers
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter()
{
    HtmlFragment = "<div style='text-align: center;'>Company Report</div>",
    MaxHeight = 25
};
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
{
    HtmlFragment = "<div style='text-align: center;'>Page {page} of {total-pages}</div>",
    MaxHeight = 25
};

// Add headers and page numbers
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter()
{
    HtmlFragment = "<div style='text-align: center;'>Company Report</div>",
    MaxHeight = 25
};
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter()
{
    HtmlFragment = "<div style='text-align: center;'>Page {page} of {total-pages}</div>",
    MaxHeight = 25
};

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These features transform your ASP.NET PDF viewer into a comprehensive solution for document management, supporting everything from simple display to complex editing operations, including text selection and print functionality. You can even work with other formats like Excel, Word, DOCX files, and PowerPoint through IronPDF's conversion capabilities.

Conclusion

Creating an ASP.NET Core PDF viewer with IronPDF eliminates the complexity of JavaScript-based solutions while providing professional-grade PDF document handling. By leveraging the browser's native capabilities and Chrome's rendering engine, you can create, display, and manage PDF files with just a few lines of code—no default configurations or complex setup required.

The combination of server-side generation and browser-based viewing provides the perfect balance of support, performance, and user experience for your web applications. Whether you need to display PDF files, handle forms, edit existing documents, or print PDFs, IronPDF's straightforward API makes implementation simple. The library is frequently updated to ensure compatibility with the latest .NET frameworks and Windows environments.

Ready to build your own PDF viewer in your ASP.NET Core project? Start with a free trial to find the right plan. Need help getting started? Check out this detailed tutorial or browse the complete documentation for more examples.

Häufig gestellte Fragen

Was ist der Zweck eines ASP.NET Core PDF-Viewers?

Ein ASP.NET Core PDF-Viewer ermöglicht es Ihnen, PDF-Dateien direkt im Browser anzuzeigen, sodass Benutzer Dokumente wie Rechnungen, Berichte oder interaktive PDFs ohne externe Plugins einfach anzeigen können.

Wie vereinfacht IronPDF die Erstellung eines PDF-Viewers in ASP.NET Core?

IronPDF vereinfacht den Prozess, indem es die integrierten PDF-Viewer-Fähigkeiten des Browsers nutzt und pixelgenaue PDFs auf der Serverseite erstellt, wodurch die Notwendigkeit komplexer JavaScript-Bibliotheken oder Drittanbieter-Plugins entfällt.

Kann IronPDF interaktive PDF-Dokumente verwalten?

Ja, IronPDF kann interaktive PDF-Dokumente verwalten, sodass Benutzer Formulare ausfüllen und direkt im Browser mit PDF-Inhalten interagieren können.

Was sind die Vorteile der Verwendung von IronPDF für die Anzeige von PDFs in Webanwendungen?

IronPDF bietet eine zuverlässige, effiziente Möglichkeit, PDFs in Webanwendungen anzuzeigen, mit Funktionen wie serverseitiger PDF-Erstellung und nahtloser Integration mit ASP.NET Core-Anwendungen.

Ist es notwendig, Drittanbieter-Browser-Plugins mit IronPDF zu verwenden?

Nein, IronPDF nutzt die integrierten PDF-Viewer-Fähigkeiten des Browsers, sodass keine Drittanbieter-Browser-Plugins erforderlich sind, um PDF-Dateien anzuzeigen.

Welche Arten von PDF-Dokumenten können mit einem ASP.NET Core PDF-Viewer angezeigt werden?

Ein ASP.NET Core PDF-Viewer kann verschiedene Arten von PDF-Dokumenten wie Rechnungen, Berichte und interaktive Formulare direkt im Browser anzeigen.

Unterstützt IronPDF die serverseitige PDF-Erstellung?

Ja, IronPDF unterstützt die serverseitige PDF-Erstellung und sorgt dafür, dass Dokumente vor der Anzeige im Browser genau und effizient gerendert werden.

Wie stellt IronPDF sicher, dass PDF-Darstellungen pixelgenau sind?

IronPDF sorgt für pixelgenaue PDF-Darstellung durch die Verwendung fortschrittlicher Algorithmen und Techniken zur getreuen Reproduktion des auf der Serverseite erstellten Erscheinungsbildes von Dokumenten.

Welche Programmiersprache wird verwendet, um mit IronPDF einen ASP.NET Core PDF-Viewer zu erstellen?

Der ASP.NET Core PDF-Viewer wird mit C# und dem ASP.NET Core-Framework erstellt, wobei IronPDF zur PDF-Verarbeitung und -Anzeige verwendet wird.

Curtis Chau

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Technischer Autor

Curtis Chau hat einen Bachelor-Abschluss in Informatik von der Carleton University und ist spezialisiert auf Frontend-Entwicklung mit Expertise in Node.js, TypeScript, JavaScript und React. Leidenschaftlich widmet er sich der Erstellung intuitiver und ästhetisch ansprechender Benutzerschnittstellen und arbeitet gerne mit modernen Frameworks sowie der Erstellung gut strukturierter, optisch ansprechender ...