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USING IRONPDF

Creating a .NET Core PDF Generator with IronPDF

What Makes a Reliable .NET Core PDF Generator?

A reliable .NET Core PDF generator should offer Chrome-based rendering for precise HTML to PDF conversion, support cross-platform deployment without native dependencies, and provide complete APIs for creating, editing, and manipulating PDF documents in containerized environments.

IronPDF provides a Chrome-based .NET Core PDF library that converts HTML to PDF with zero native dependencies, enabling smooth Docker deployment and cross-platform compatibility for engineers building containerized applications.

Building PDF documents in .NET Core applications requires a PDF library that handles HTML content, maintains formatting, and supports cross-platform deployment. If you're developing ASP.NET Core web APIs or console applications, a reliable .NET Core PDF generator simplifies the entire process of creating documents from various sources. It's a massive time-saver.

Start your free trial and discover why developers choose IronPDF for mission-critical PDF generation in production environments.

IronPDF stands out as a complete .NET Core PDF library. It uses a Chrome rendering engine to create PDF documents with pixel-perfect accuracy. This approach means you don't need to learn complex PDF APIs or struggle with layout issues; you can use your existing HTML and CSS skills to generate PDF files. The library's extensive documentation and code examples make implementation straightforward.

Why is Chrome-Based Rendering Important for PDF Generation?

What Cross-Platform Deployment Options Are Supported?

How Does IronPDF Compare to Other .NET PDF Libraries?

How Does IronPDF Simplify Generating PDF Documents in .NET Core?

IronPDF transforms the traditionally complex task of PDF generation into straightforward code that any .NET developer can implement. The library uses the ChromePdfRenderer class to convert HTML strings, files, or URLs directly into PDF format. This fluent API approach provides extensive customization options while maintaining high performance across different platforms.

The real power lies in how IronPDF handles converting HTML content into professional PDF files. Instead of manually positioning or drawing elements, you write standard HTML with CSS styling, and the library handles the conversion smoothly. The resulting PDF files aren't mere images of text; they're fully-featured documents where users can select and search for text.

Beyond basic PDF generation, you can use IronPDF's advanced editing tools to edit PDF documents. With these, you can merge documents, add watermarks, annotations, and more. Check out the related tutorial to see more example source code for these tools.

What Code Patterns Does IronPDF Use for PDF Creation?

Why Choose HTML to PDF Conversion Over Traditional PDF APIs?

How Do You Handle Complex Document Layouts and Styling?

How Do You Install IronPDF via the NuGet Package Manager?

Getting started with IronPDF in Visual Studio requires just one NuGet package installation. Open the NuGet Package Manager Console, ensure your project name is selected in the 'Default project' dropdown, and run the following command:

Install-Package IronPdf
Install-Package IronPdf
SHELL

This single NuGet package provides all the functionality needed to create, edit, and generate PDF files in your .NET Core applications. The installation automatically configures your project for PDF generation across Windows, Linux, and Docker environments. It also offers support for various .NET versions including .NET Framework 4.6.2+, .NET Core 3.1+, and .NET Standard 2.0+.

What Are the System Requirements for IronPDF?

How Do You Verify the Installation Was Successful?

What Additional Dependencies Might Be Required?

How Can You Create Your First PDF Document from HTML?

Let's create PDF documents using a practical invoice document example. This demonstrates how to generate PDF files from HTML content with proper formatting and data binding:

using IronPdf;
using System.IO;
using System.Text;

// Initialize the Chrome renderer for HTML to PDF conversion
var renderer = new ChromePdfRenderer();

// Configure rendering options for professional output
renderer.RenderingOptions.MarginTop = 25;
renderer.RenderingOptions.MarginBottom = 25;
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;

// Build HTML content dynamically using StringBuilder for performance
var htmlBuilder = new StringBuilder();
htmlBuilder.Append(@"
    <html>
    <head>
        <style>
            body { font-family: Arial, sans-serif; font-size: 14px; }
            .invoice-header { background: #f0f0f0; padding: 20px; }
            table { width: 100%; border-collapse: collapse; }
            th, td { padding: 10px; text-align: left; border-bottom: 1px solid #ddd; }
        </style>
    </head>
    <body>
        <div class='invoice-header'>
            <h1>Invoice #INV-2024-001</h1>
            <p>Date: " + DateTime.Now.ToString("MM/dd/yyyy") + @"</p>
        </div>
        <table>
            <tr><th>Item</th><th>Quantity</th><th>Price</th></tr>");

// Dynamically populate invoice line items
for (int i = 0; i < 3; i++)
{
    htmlBuilder.Append($"<tr><td>Product #{i + 1}</td><td>{i + 1}</td><td>$25.00</td></tr>");
}

htmlBuilder.Append(@"
        </table>
        <p><strong>This is a new paragraph with a summary.</strong></p>
    </body>
    </html>");

// Convert HTML string to PDF document
PdfDocument pdfObject = renderer.RenderHtmlAsPdf(htmlBuilder.ToString());

// Save the generated PDF to disk
pdfObject.SaveAs("invoice.pdf");
using IronPdf;
using System.IO;
using System.Text;

// Initialize the Chrome renderer for HTML to PDF conversion
var renderer = new ChromePdfRenderer();

// Configure rendering options for professional output
renderer.RenderingOptions.MarginTop = 25;
renderer.RenderingOptions.MarginBottom = 25;
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;

// Build HTML content dynamically using StringBuilder for performance
var htmlBuilder = new StringBuilder();
htmlBuilder.Append(@"
    <html>
    <head>
        <style>
            body { font-family: Arial, sans-serif; font-size: 14px; }
            .invoice-header { background: #f0f0f0; padding: 20px; }
            table { width: 100%; border-collapse: collapse; }
            th, td { padding: 10px; text-align: left; border-bottom: 1px solid #ddd; }
        </style>
    </head>
    <body>
        <div class='invoice-header'>
            <h1>Invoice #INV-2024-001</h1>
            <p>Date: " + DateTime.Now.ToString("MM/dd/yyyy") + @"</p>
        </div>
        <table>
            <tr><th>Item</th><th>Quantity</th><th>Price</th></tr>");

// Dynamically populate invoice line items
for (int i = 0; i < 3; i++)
{
    htmlBuilder.Append($"<tr><td>Product #{i + 1}</td><td>{i + 1}</td><td>$25.00</td></tr>");
}

htmlBuilder.Append(@"
        </table>
        <p><strong>This is a new paragraph with a summary.</strong></p>
    </body>
    </html>");

// Convert HTML string to PDF document
PdfDocument pdfObject = renderer.RenderHtmlAsPdf(htmlBuilder.ToString());

// Save the generated PDF to disk
pdfObject.SaveAs("invoice.pdf");
Imports IronPdf
Imports System.IO
Imports System.Text

' Initialize the Chrome renderer for HTML to PDF conversion
Dim renderer = New ChromePdfRenderer()

' Configure rendering options for professional output
renderer.RenderingOptions.MarginTop = 25
renderer.RenderingOptions.MarginBottom = 25
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4

' Build HTML content dynamically using StringBuilder for performance
Dim htmlBuilder = New StringBuilder()
htmlBuilder.Append("
    <html>
    <head>
        <style>
            body { font-family: Arial, sans-serif; font-size: 14px; }
            .invoice-header { background: #f0f0f0; padding: 20px; }
            table { width: 100%; border-collapse: collapse; }
            th, td { padding: 10px; text-align: left; border-bottom: 1px solid #ddd; }
        </style>
    </head>
    <body>
        <div class='invoice-header'>
            <h1>Invoice #INV-2024-001</h1>
            <p>Date: " & DateTime.Now.ToString("MM/dd/yyyy") & "</p>
        </div>
        <table>
            <tr><th>Item</th><th>Quantity</th><th>Price</th></tr>")

' Dynamically populate invoice line items
For i As Integer = 0 To 2
    htmlBuilder.Append($"<tr><td>Product #{i + 1}</td><td>{i + 1}</td><td>$25.00</td></tr>")
Next

htmlBuilder.Append("
        </table>
        <p><strong>This is a new paragraph with a summary.</strong></p>
    </body>
    </html>")

' Convert HTML string to PDF document
Dim pdfObject As PdfDocument = renderer.RenderHtmlAsPdf(htmlBuilder.ToString())

' Save the generated PDF to disk
pdfObject.SaveAs("invoice.pdf")
$vbLabelText   $csharpLabel

This code creates a professional invoice document by combining HTML markup with dynamic data. Note how we added a custom font size in the CSS and dynamically generated table rows using a for loop. We also included a new paragraph element (<p>). The RenderHtmlAsPdf method returns a PdfDocument object, which gives you full control over the generated file. For more advanced HTML to PDF scenarios, explore the HTML to PDF tutorial. You can also learn about custom margins and paper sizes to further customize your PDFs.

What Does the Generated PDF Look Like?

The screenshot below shows our example invoice perfectly rendered into a PDF document format.

Professional PDF invoice displaying Invoice #INV-2024-001 with date 10/15/2025, featuring a light gray header section, organized product table showing three items with quantities and $25 unit prices, including company branding elements and a summary paragraph at the bottom

How Do You Handle Dynamic Data and Templates?

What Are Common Rendering Options You Should Configure?

How Can You Debug HTML Rendering Issues?

How Do You Generate PDF Files from URLs and Web Pages?

IronPDF excels at converting existing web pages into PDF files. This capability proves invaluable when generating PDF documents from reporting dashboards or web-based forms:

// Create a new ChromePdfRenderer instance for URL conversion
var renderer = new ChromePdfRenderer();

// Configure page layout and rendering options
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
renderer.RenderingOptions.PrintHtmlBackgrounds = true;
renderer.RenderingOptions.EnableJavaScript = true;
renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;

// Add render delay to ensure all assets load
renderer.RenderingOptions.WaitFor.RenderDelay(1000);

// Convert a public URL to PDF document
PdfDocument pdfDocument = renderer.RenderUrlAsPdf("___PROTECTED_URL_94___");

// Save PDF to application directory
string filePath = Path.Combine(Directory.GetCurrentDirectory(), "webpage.pdf");
pdfDocument.SaveAs(filePath);
// Create a new ChromePdfRenderer instance for URL conversion
var renderer = new ChromePdfRenderer();

// Configure page layout and rendering options
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4;
renderer.RenderingOptions.PrintHtmlBackgrounds = true;
renderer.RenderingOptions.EnableJavaScript = true;
renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;

// Add render delay to ensure all assets load
renderer.RenderingOptions.WaitFor.RenderDelay(1000);

// Convert a public URL to PDF document
PdfDocument pdfDocument = renderer.RenderUrlAsPdf("___PROTECTED_URL_94___");

// Save PDF to application directory
string filePath = Path.Combine(Directory.GetCurrentDirectory(), "webpage.pdf");
pdfDocument.SaveAs(filePath);
' Create a new ChromePdfRenderer instance for URL conversion
Dim renderer As New ChromePdfRenderer()

' Configure page layout and rendering options
renderer.RenderingOptions.PaperSize = IronPdf.Rendering.PdfPaperSize.A4
renderer.RenderingOptions.PrintHtmlBackgrounds = True
renderer.RenderingOptions.EnableJavaScript = True
renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print

' Add render delay to ensure all assets load
renderer.RenderingOptions.WaitFor.RenderDelay(1000)

' Convert a public URL to PDF document
Dim pdfDocument As PdfDocument = renderer.RenderUrlAsPdf("___PROTECTED_URL_94___")

' Save PDF to application directory
Dim filePath As String = Path.Combine(Directory.GetCurrentDirectory(), "webpage.pdf")
pdfDocument.SaveAs(filePath)
$vbLabelText   $csharpLabel

The library handles JavaScript execution, loads external resources like images and stylesheets, and maintains responsive layout during conversion. This makes it perfect for creating reports from existing web applications. Learn more about converting URLs to PDF in the detailed guide. You can also configure HTTP request headers for authentication and handle cookies for session-based content.

Wikipedia's main page converted to PDF format, preserving the complete layout including Jozo Tomasevich biography article, news section with current events, historical 'On this day' content for October 15, demonstrating IronPDF's capability to maintain complex multi-column layouts, images, and Wikipedia's characteristic design elements

How Do You Handle Authentication for Protected URLs?

What JavaScript Rendering Options Should You Consider?

When Should You Use URL Conversion vs HTML String Conversion?

What Advanced PDF Features Are Available for Complex Reports?

Professional PDF documents often require additional elements beyond basic content. IronPDF provides methods to improve your PDF documents with headers, footers, and watermarks. The headers and footers API offers complete control over document presentation:

// Create renderer with advanced configuration
var renderer = new ChromePdfRenderer();

// Configure professional headers with company branding
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
{
    MaxHeight = 25,
    HtmlFragment = "<div style='text-align:center'>Company Report</div>"
};

// Add footers with automatic page numbering
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
{
    MaxHeight = 25,
    HtmlFragment = "<div>Page {page} of {total-pages}</div>"
};

// Enable interactive form field generation
renderer.RenderingOptions.CreatePdfFormsFromHtml = true;

// Define HTML form structure
string formHtml = @"
    <form>
        <label>Name:</label>
        <input type='text' name='name' placeholder='Enter your name'/>
        <label>Email:</label>
        <input type='email' name='email' placeholder='email@example.com'/>
        <button type='submit'>Submit</button>
    </form>";

// Generate PDF with interactive form fields
PdfDocument formDocument = renderer.RenderHtmlAsPdf(formHtml);
// Create renderer with advanced configuration
var renderer = new ChromePdfRenderer();

// Configure professional headers with company branding
renderer.RenderingOptions.HtmlHeader = new HtmlHeaderFooter
{
    MaxHeight = 25,
    HtmlFragment = "<div style='text-align:center'>Company Report</div>"
};

// Add footers with automatic page numbering
renderer.RenderingOptions.HtmlFooter = new HtmlHeaderFooter
{
    MaxHeight = 25,
    HtmlFragment = "<div>Page {page} of {total-pages}</div>"
};

// Enable interactive form field generation
renderer.RenderingOptions.CreatePdfFormsFromHtml = true;

// Define HTML form structure
string formHtml = @"
    <form>
        <label>Name:</label>
        <input type='text' name='name' placeholder='Enter your name'/>
        <label>Email:</label>
        <input type='email' name='email' placeholder='email@example.com'/>
        <button type='submit'>Submit</button>
    </form>";

// Generate PDF with interactive form fields
PdfDocument formDocument = renderer.RenderHtmlAsPdf(formHtml);
' Create renderer with advanced configuration
Dim renderer As New ChromePdfRenderer()

' Configure professional headers with company branding
renderer.RenderingOptions.HtmlHeader = New HtmlHeaderFooter With {
    .MaxHeight = 25,
    .HtmlFragment = "<div style='text-align:center'>Company Report</div>"
}

' Add footers with automatic page numbering
renderer.RenderingOptions.HtmlFooter = New HtmlHeaderFooter With {
    .MaxHeight = 25,
    .HtmlFragment = "<div>Page {page} of {total-pages}</div>"
}

' Enable interactive form field generation
renderer.RenderingOptions.CreatePdfFormsFromHtml = True

' Define HTML form structure
Dim formHtml As String = "
    <form>
        <label>Name:</label>
        <input type='text' name='name' placeholder='Enter your name'/>
        <label>Email:</label>
        <input type='email' name='email' placeholder='email@example.com'/>
        <button type='submit'>Submit</button>
    </form>"

' Generate PDF with interactive form fields
Dim formDocument As PdfDocument = renderer.RenderHtmlAsPdf(formHtml)
$vbLabelText   $csharpLabel

This example demonstrates how to add consistent headers across all pages and create interactive form fields within the PDF document. The system automatically handles page numbering and form field rendering. For complex reports, you can also implement table of contents, bookmarks, and custom page breaks.

Interactive PDF form featuring 'Company Report' header, professionally styled Name and Email input fields with visible borders and placeholder text, Submit button with hover state, demonstrating IronPDF's ability to convert HTML forms into fillable PDF documents with preserved styling and functionality

How Do You Create Multi-Page Reports with Consistent Headers?

What Interactive Elements Can You Add to PDFs?

How Do You Implement Page Breaks and Section Management?

How Can You Improve Performance with Async Operations in ASP.NET Core?

For web applications handling multiple PDF generation requests, async operations improve responsiveness:

// Async method for efficient PDF generation
public async Task<byte[]> GeneratePdfAsync(string htmlContent)
{
    var renderer = new ChromePdfRenderer();

    // Configure for optimal web performance
    renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;

    // Generate PDF asynchronously to avoid blocking
    PdfDocument PDF = await renderer.RenderHtmlAsPdfAsync(htmlContent);

    // Return binary data for API responses
    return PDF.BinaryData;
}

// ASP.NET Core controller implementation
[HttpPost]
public async Task<IActionResult> CreateInvoice([FromBody] InvoiceData data)
{
    // Build HTML from invoice data
    string HTML = BuildInvoiceHtml(data);

    // Generate PDF asynchronously
    byte[] pdfBytes = await GeneratePdfAsync(HTML);

    // Return PDF file with proper headers
    return File(pdfBytes, "application/pdf", "invoice.pdf");
}
// Async method for efficient PDF generation
public async Task<byte[]> GeneratePdfAsync(string htmlContent)
{
    var renderer = new ChromePdfRenderer();

    // Configure for optimal web performance
    renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print;

    // Generate PDF asynchronously to avoid blocking
    PdfDocument PDF = await renderer.RenderHtmlAsPdfAsync(htmlContent);

    // Return binary data for API responses
    return PDF.BinaryData;
}

// ASP.NET Core controller implementation
[HttpPost]
public async Task<IActionResult> CreateInvoice([FromBody] InvoiceData data)
{
    // Build HTML from invoice data
    string HTML = BuildInvoiceHtml(data);

    // Generate PDF asynchronously
    byte[] pdfBytes = await GeneratePdfAsync(HTML);

    // Return PDF file with proper headers
    return File(pdfBytes, "application/pdf", "invoice.pdf");
}
Imports System.Threading.Tasks
Imports IronPdf
Imports Microsoft.AspNetCore.Mvc

' Async method for efficient PDF generation
Public Async Function GeneratePdfAsync(htmlContent As String) As Task(Of Byte())
    Dim renderer As New ChromePdfRenderer()

    ' Configure for optimal web performance
    renderer.RenderingOptions.CssMediaType = IronPdf.Rendering.PdfCssMediaType.Print

    ' Generate PDF asynchronously to avoid blocking
    Dim PDF As PdfDocument = Await renderer.RenderHtmlAsPdfAsync(htmlContent)

    ' Return binary data for API responses
    Return PDF.BinaryData
End Function

' ASP.NET Core controller implementation
<HttpPost>
Public Async Function CreateInvoice(<FromBody> data As InvoiceData) As Task(Of IActionResult)
    ' Build HTML from invoice data
    Dim HTML As String = BuildInvoiceHtml(data)

    ' Generate PDF asynchronously
    Dim pdfBytes As Byte() = Await GeneratePdfAsync(HTML)

    ' Return PDF file with proper headers
    Return File(pdfBytes, "application/pdf", "invoice.pdf")
End Function
$vbLabelText   $csharpLabel

This pattern allows ASP.NET Core applications to generate PDF files efficiently without blocking threads, a massive improvement over older web technologies where file generation was often a cumbersome process. The byte array output works perfectly for API endpoints that need to return files directly to clients. For improved performance, consider using parallel processing for batch operations and memory streams to reduce disk I/O.

Notice how the File() method returns the PDF with the correct application/pdf content type, ensuring browsers handle the response correctly. When working with large PDF documents or multiple concurrent requests, this async approach maintains optimal system performance. For more insights on async patterns, consult the official ASP.NET Core documentation. You can also explore performance optimization techniques specific to IronPDF.

What Are Best Practices for Handling Concurrent PDF Generation?

How Do You Implement Proper Error Handling in Async Operations?

When Should You Use Memory Streams vs File System Storage?

What Are the Key Deployment Considerations?

IronPDF supports deployment across various environments. For Docker containers, ensure you include the necessary dependencies in your Dockerfile as outlined in the Docker deployment guide. The library works smoothly on Windows Server, Linux distributions, and cloud platforms like Azure and AWS. Each environment may require specific configuration for fonts and rendering, but the core API remains consistent. The Microsoft documentation on .NET Core deployment provides additional best practices for production environments.

For containerized deployments, consider using IronPDF as a remote container to separate PDF generation from your main application. This approach improves scalability and allows for better resource management. You can also use IronPDF.Slim for reduced deployment size in environments with package constraints. When deploying to Kubernetes environments, ensure proper configuration of health checks and resource limits.

How Do You Configure IronPDF for Docker Deployments?

What Linux-Specific Dependencies Should You Include?

How Can You Monitor PDF Generation in Production Environments?

What Security Considerations Apply to PDF Generation Services?

Ready to Start Building Your PDF Generator Today?

IronPDF transforms PDF generation in .NET Core from a complex challenge into a straightforward implementation. With support for HTML content, a rich set of features, and consistent cross-platform behavior, it's the ideal choice for developers who need to generate PDF documents reliably. The library's security features, including encryption and digital signatures, ensure your documents meet compliance requirements.

Ready to implement your own PDF document generator? Start with a free trial to explore all features without limitations. The documentation provides extensive examples and guides to help you create professional PDF files that meet your exact requirements. Whether you're building invoice systems, generating reports, or converting existing web content, IronPDF provides the tools to deliver pixel-perfect results.

For production deployments, explore licensing options that fit your project scale. The investment in a quality PDF library pays dividends through reduced development time and consistent, professional output across all your .NET applications. IronPDF's support team and complete troubleshooting guides ensure you're never stuck when implementing PDF functionality.

Frequently Asked Questions

What is the primary function of IronPDF in .NET Core?

IronPDF is primarily used to convert HTML to PDF in .NET Core applications, enabling developers to create invoices, reports, and other documents with pixel-perfect rendering.

How does IronPDF ensure pixel-perfect rendering?

IronPDF ensures pixel-perfect rendering by using advanced rendering techniques that accurately convert HTML, CSS, and JavaScript into high-quality PDF documents.

Can IronPDF be used to generate reports in .NET Core?

Yes, IronPDF is capable of generating detailed reports in .NET Core by converting HTML-based report templates into professional-grade PDF documents.

Is it possible to convert web pages to PDF using IronPDF?

Absolutely, IronPDF can convert entire web pages to PDF, preserving the layout and style specified in the original HTML and CSS.

What are some common use cases for IronPDF?

Common use cases for IronPDF include generating invoices, creating business reports, converting HTML forms to PDF, and archiving web content.

Does IronPDF support .NET Core applications?

Yes, IronPDF fully supports .NET Core applications, making it a versatile choice for developers working across different .NET platforms.

How does IronPDF handle CSS and JavaScript in HTML to PDF conversion?

IronPDF processes CSS and JavaScript during the conversion process to ensure that the visual layout and dynamic content of the HTML are accurately represented in the PDF.

Can IronPDF generate PDFs from HTML strings?

Yes, IronPDF can generate PDFs from HTML strings, allowing developers to dynamically create PDF documents from HTML content generated within their applications.

Is it possible to customize the appearance of PDFs with IronPDF?

IronPDF provides extensive customization options, allowing developers to control the appearance of PDFs by specifying custom headers, footers, and styles using HTML and CSS.

What advantages does IronPDF offer over other .NET PDF libraries?

IronPDF offers several advantages, including ease of integration with .NET Core, high-quality rendering, support for complex document layouts, and robust handling of HTML, CSS, and JavaScript.

Curtis Chau
Technical Writer

Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.

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