IronPDF与PDFCrowd之间的比较

IronPDF专为.NET开发者设计，提供现代的、流畅的API，遵循C#惯例。 从安装到输出的所有内容都感觉像是专为.NET生态系统量身定制的一样。

安装

IronPDF可以通过单个命令通过NuGet安装：

Install-Package IronPdf

不需要配置单独的许可证服务器或外部依赖。 它可以在Visual Studio、JetBrains Rider或任何.NET兼容的CLI中无缝工作，使其易于在本地或CI/CD环境中入门。

API设计

IronPDF的强类型API使用了一种流畅的语法，对于.NET开发者来说感觉很自然。 无论你是在渲染HTML字符串、Razor视图，还是从文件中提取内容，API方法都是可预测和一致的。

关键API优点包括：

• 流畅、可发现的方法（例如，RenderHtmlAsPdf）

• 智能默认值，没有太多的配置就能正常工作

• 为所有主要方法提供本地异步/等待支持

• 与.NET的深度集成，支持流、字节数组和文件输入

示例：渲染基本HTML

using IronPdf;

var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");
pdf.SaveAs("output.pdf");

输出

• 没有样板代码

• 完全离线工作

• 输出准备在三行完成

为可扩展应用的异步支持

using IronPdf;

var renderer = new ChromePdfRenderer();
var pdf = await renderer.RenderHtmlAsPdfAsync("<h1>Async Render</h1>");
await pdf.SaveAsAsync("async-output.pdf");

using IronPdf;

var renderer = new ChromePdfRenderer();
var pdf = await renderer.RenderHtmlAsPdfAsync("<h1>Async Render</h1>");
await pdf.SaveAsAsync("async-output.pdf");

Imports IronPdf

Private renderer = New ChromePdfRenderer()
Private pdf = await renderer.RenderHtmlAsPdfAsync("<h1>Async Render</h1>")
Await pdf.SaveAsAsync("async-output.pdf")

这对于需要非阻塞操作的现代网络应用、后台工作线程或UI线程是理想的。

从文件、流或字节数组中输入

IronPDF为不同的HTML源提供重载方法：

// From HTML file
var pdfFromFile = renderer.RenderHtmlFileAsPdf("invoice.html");

// From stream
using var stream = File.OpenRead("template.html");
var pdfFromStream = renderer.RenderHtmlAsPdf(stream);

// From byte array
byte[] htmlBytes = File.ReadAllBytes("layout.html");
var pdfFromBytes = renderer.RenderHtmlAsPdf(htmlBytes);

// From HTML file
var pdfFromFile = renderer.RenderHtmlFileAsPdf("invoice.html");

// From stream
using var stream = File.OpenRead("template.html");
var pdfFromStream = renderer.RenderHtmlAsPdf(stream);

// From byte array
byte[] htmlBytes = File.ReadAllBytes("layout.html");
var pdfFromBytes = renderer.RenderHtmlAsPdf(htmlBytes);

' From HTML file
Dim pdfFromFile = renderer.RenderHtmlFileAsPdf("invoice.html")

' From stream
Dim stream = File.OpenRead("template.html")
Dim pdfFromStream = renderer.RenderHtmlAsPdf(stream)

' From byte array
Dim htmlBytes() As Byte = File.ReadAllBytes("layout.html")
Dim pdfFromBytes = renderer.RenderHtmlAsPdf(htmlBytes)

当处理动态内容管道、模板引擎或文件上传时，这种灵活性是无价的。

文档与示例

IronPDF在文档提供方面表现出色：

• 广泛的在线文档，提供.NET 6/7/8示例

• 丰富的代码示例和教程

• 可在GitHub上获取的实际项目

• 专用的24/5开发者支持，以便于故障排除或集成协助

IDE与开发体验

IronPDF与Visual Studio深度集成：

• 完整的IntelliSense支持

• 兼容Blazor、WinForms、WPF、MVC、MAUI

• 易于在Docker、Azure DevOps和其他CI/CD环境中使用

PDFCrowd采用不同的方法，其HTTP优先模型。 它旨在成为一个快速的跨平台解决方案，而不是一个完全集成的.NET库。 然而，由于其在线的本质，它可以轻松地集成到您的网站中，通过保存为PDF链接允许访问者下载内容为PDF。

安装

技术上来说，你没有什么要安装的，除非你选择他们的C# SDK包装器。 在其核心，PDFCrowd通过REST操作：

• 需要API密钥和端点设置

• 可选的SDK包装内部使用HttpClient

• 工作在任何可以发送HTTP POST的系统上

API设计

API围绕远程请求构建。 虽然这使其高度便携，但牺牲了强类型、流畅界面的便利性和安全性。

• 配置以方法参数或POST数据的方式传递

• 没有流畅的链式或对象建模

• 最小错误处理—主要由HTTP状态码决定

• 缺乏异步/等待和强类型.NET惯例

示例：通过SDK的基本转换

pdfcrowd.HtmlToPdfClient client =
                new pdfcrowd.HtmlToPdfClient("demo", "ce544b6ea52a5621fb9d55f8b542d14d");

client.convertStringToFile("<h1>Hello World</h1>", "output.pdf");

pdfcrowd.HtmlToPdfClient client =
                new pdfcrowd.HtmlToPdfClient("demo", "ce544b6ea52a5621fb9d55f8b542d14d");

client.convertStringToFile("<h1>Hello World</h1>", "output.pdf");

Dim client As New pdfcrowd.HtmlToPdfClient("demo", "ce544b6ea52a5621fb9d55f8b542d14d")

client.convertStringToFile("<h1>Hello World</h1>", "output.pdf")

输出

• 需要远程访问和认证

• 适用于基本任务，但无法控制渲染内部

手动HTTP POST示例

using var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Post, "https://api.pdfcrowd.com/convert/")
{
    Content = new StringContent("<h1>Manual POST</h1>", Encoding.UTF8, "text/html")
};
request.Headers.Add("Authorization", "apikey username:apikey");

var response = await client.SendAsync(request);
await using var file = File.Create("manual-output.pdf");
await response.Content.CopyToAsync(file);

using var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Post, "https://api.pdfcrowd.com/convert/")
{
    Content = new StringContent("<h1>Manual POST</h1>", Encoding.UTF8, "text/html")
};
request.Headers.Add("Authorization", "apikey username:apikey");

var response = await client.SendAsync(request);
await using var file = File.Create("manual-output.pdf");
await response.Content.CopyToAsync(file);

Dim client = New HttpClient()
Dim request = New HttpRequestMessage(HttpMethod.Post, "https://api.pdfcrowd.com/convert/") With {.Content = New StringContent("<h1>Manual POST</h1>", Encoding.UTF8, "text/html")}
request.Headers.Add("Authorization", "apikey username:apikey")

Dim response = Await client.SendAsync(request)
Await var file = File.Create("manual-output.pdf")
Await response.Content.CopyToAsync(file)

这提供了更多的控制权—但也增加了复杂性，去除了.NET本地支持功能如流、异常或异步行为管理。

错误处理

try
{
    var client = new HtmlToPdfClient("username", "apikey");
    client.ConvertStringToFile("<h1>Error Test</h1>", "test.pdf");
}
catch (PdfcrowdError e)
{
    Console.WriteLine($"PDFCrowd API Error: {e.Message}");
}

try
{
    var client = new HtmlToPdfClient("username", "apikey");
    client.ConvertStringToFile("<h1>Error Test</h1>", "test.pdf");
}
catch (PdfcrowdError e)
{
    Console.WriteLine($"PDFCrowd API Error: {e.Message}");
}

Try
	Dim client = New HtmlToPdfClient("username", "apikey")
	client.ConvertStringToFile("<h1>Error Test</h1>", "test.pdf")
Catch e As PdfcrowdError
	Console.WriteLine($"PDFCrowd API Error: {e.Message}")
End Try

你必须自己管理API密钥、配额限制和连接错误，通常是在Visual Studio工作流之外。 这就是为什么PDFCrowd更适合那些不厂模板的静态HTML页面，或个人的WordPress网站。 如果你想在你的网站上使用PDFCrowd的API，你只需嵌入一段简短的html代码来添加一个简单的保存到PDF按钮或链接，让访问者能够保存你网站的内容。

文档与示例

PDFCrowd提供：

• 基础的API参考

• 简单的SDK使用示例

• 没有发现性的方法或IntelliSense支持

• 最小的实际教程或社区集成

IDE与开发体验

由于PDFCrowd运行在.NET运行时之外：

• 缺乏与Visual Studio的紧密集成

• 没有异步/等待支持，没有MemoryStream重载

• 需要更多的手动设置和错误处理

• 更适合简单的用例或快速脚本

现代网站和内部业务工具是使用响应布局、交互式JavaScript和复杂CSS构建的。 如果你的PDF工具无法处理这样的技术堆栈，你的输出将会在视觉上和功能上崩溃。

IronPDF

IronPDF利用完整的基于Chromium的渲染引擎。这意味着在浏览器中看到的就是你在PDF中得到的——没有惊喜，没有布局偏移。 它能够忠实渲染：

• JavaScript密集的应用程序，包括SPA, tab页接口和图表（Chart.js，D3等）

• 响应CSS，使用Grid、Flexbox和媒体查询

• 网页字体、内联SVG和其他动态或嵌入资产

IronPDF还允许你控制渲染时机，可通过RenderDelay和WaitForWindowStatus等选项，确保JavaScript执行在PDF生成开始前完成。 这在处理AJAX加载内容或延迟DOM操作时至关重要。

PDFCrowd

PDFCrowd的渲染引擎要更为有限。 虽能够合理地处理静态HTML和CSS，但常常难以应对：

• JavaScript渲染的组件，包括图形或客户端导航状态

• 复杂CSS布局，如Flexbox或媒体查询

• 破坏品牌一致性的字体替代问题

更糟的是，没有渲染延迟或事件生命周期的控制——所以如果你的内容是动态加载的，它可能干脆不会出现在最终的PDF中。

在批量生成PDF时——无论是发票、报告还是客户声明——您需要一个系统跟上。

IronPDF

IronPDF本地运行，这意味着没有对互联网带宽或第三方服务器的依赖。 这转化为：

• 零网络延迟

• 对并发和资源分配的完全控制

• 即使在压力下也能稳定渲染速度

凭借多线程和异步支持，IronPDF可轻松扩展到中层基础设施上每分钟100+ PDF。 它已准备好支持企业规模的批处理作业或实时文档生成管道。

PDFCrowd

PDFCrowd是一个基于云的API，这给性能引入了几个瓶颈：

• 每个请求都受网络延迟的制约

• PDF生成速度依赖于当前的服务器负载

• 你受到你的订阅级别的配额和节流限制的制约

虽然在处理偶尔的工作或原型设计时表现出色，但不太适合持续的高吞吐量操作。 由于排队和速率限制，批量处理变得麻烦。

最终，你的用户通过PDF的外观来评判它们。 A misaligned table, missing chart, or default font can compromise the document’s professionalism.

IronPDF Output:

• Layout precision that matches Chrome pixel-for-pixel

• Accurate font rendering, including custom and embedded fonts

• Consistent styling, including page-level headers, footers, and spacing

• JavaScript-executed elements like charts and dynamic sections render correctly

PDFCrowd Output:

• May default to system fonts when custom fonts are used

• Struggles with interactive content or JavaScript-loaded sections

• Headers and footers may be misaligned or omitted entirely

• Visual fidelity often degrades with complex page layouts

To support this, we’ve included benchmark visuals and performance comparisons.

Comparison of Rendering Speeds

Here, we rendered the same URL into a PDF file, and compared the time it took each library to render the PDF, and the quality of the output itself.

As you can see, not only was IronPDF faster in rendering the PDF, but it also produced a higher quality PDF that closely resembled the content on the original web page. PDFcrowd, on the other hand, couldn't even access the web page to render it.

Why did this happen? As PDFCrowd is cloud-based service for converting HTML, the request to Reddit comes from their servers, not your local browser. Reddit detects this as an automated or non-browser request and blocks or redirects it, often to a CAPTCHA or error page.

Comparison of Memory Usage

Rendering Complex PDFs

For this last test, I have created an HTML file tailored to stress test both of these libraries:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>Complex HTML Rendering PDF Test</title>

    <!-- TailwindCSS CDN -->
    <script src="https://cdn.tailwindcss.com"></script>

    <!-- Google Fonts -->
    <link href="https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@500&family=Open+Sans:wght@400;700&display=swap" rel="stylesheet" />

    <!-- Chart.js -->
    <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>

    <style>
        body {
            font-family: 'Open Sans', sans-serif;
        }
        .custom-gradient {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        @media print {
            .no-print { display: none; }
        }
    </style>
</head>
<body class="bg-gray-100 p-10 text-gray-900">

    <!-- Header with gradient -->
    <header class="custom-gradient text-white p-8 rounded-lg shadow-md text-center">
        <h1 class="text-4xl font-bold">PDF Rendering Stress Test</h1>
        <p class="mt-2 text-xl">Fonts, layout, charts, JavaScript & TailwindCSS in one document.</p>
    </header>

    <!-- Grid layout -->
    <section class="mt-10 grid grid-cols-1 md:grid-cols-2 gap-6">
        <div class="bg-white p-6 rounded shadow border">
            <h2 class="text-2xl font-semibold text-purple-700 mb-4">CSS Grid & Responsive Design</h2>
            <p class="text-gray-700 mb-2">Resize this section, and media queries adapt layout dynamically. Tailwind’s utility classes provide granular styling control.</p>
            <ul class="list-disc list-inside text-sm text-gray-600">
                <li>Flexbox & Grid</li>
                <li>Media Queries</li>
                <li>Box Shadows & Borders</li>
                <li>Web Fonts & Gradients</li>
            </ul>
        </div>

        <!-- JavaScript-rendered block -->
        <div class="bg-white p-6 rounded shadow border">
            <h2 class="text-2xl font-semibold text-green-700 mb-4">JavaScript Rendered Content</h2>
            <p class="text-gray-700 mb-2" id="js-output">[Loading dynamic content...]</p>
            <p class="text-xs text-gray-400">(This content will change on load via JavaScript)</p>
        </div>
    </section>

    <!-- Chart.js Chart -->
    <section class="mt-10 bg-white p-6 rounded shadow border">
        <h2 class="text-2xl font-semibold text-blue-600 mb-4">Real-Time Chart</h2>
        <canvas id="myChart" width="400" height="200"></canvas>
        <p class="text-sm text-gray-500 mt-2">This chart is dynamically rendered using JavaScript and Canvas.</p>
    </section>

    <!-- SVG and Icons -->
    <section class="mt-10 bg-white p-6 rounded shadow border flex flex-col md:flex-row items-center gap-6">
        <div>
            <h2 class="text-2xl font-semibold text-pink-600 mb-2">SVG Support</h2>
            <svg width="100" height="100" viewBox="0 0 100 100">
                <circle cx="50" cy="50" r="40" stroke="#f472b6" stroke-width="6" fill="#fdf2f8" />
            </svg>
        </div>
        <div>
            <h2 class="text-2xl font-semibold text-indigo-700 mb-2">Typography Test</h2>
            <p class="font-['Roboto_Slab'] text-xl">Roboto Slab – Header Style</p>
            <p class="font-['Open_Sans'] text-base mt-1">Open Sans – Body Text</p>
        </div>
    </section>

    <!-- Footer -->
    <footer class="mt-16 text-center text-sm text-gray-500 no-print">
        Rendered using TailwindCSS + JavaScript + HTML5 | © Test Suite 2025
    </footer>

    <!-- JavaScript for dynamic test and chart -->
    <script>
        // JavaScript dynamic rendering
        window.addEventListener('DOMContentLoaded', () => {
            setTimeout(() => {
                document.getElementById('js-output').textContent = 'JavaScript content successfully rendered!';
            }, 1000);
        });

        // Chart.js render
        const ctx = document.getElementById('myChart').getContext('2d');
        const myChart = new Chart(ctx, {
            type: 'bar',
            data: {
                labels: ['IronPDF', 'PDFCrowd'],
                datasets: [{
                    label: 'Render Speed (ms)',
                    data: [300, 1200],
                    backgroundColor: ['#6366f1', '#f59e0b'],
                }]
            },
            options: {
                scales: {
                    y: { beginAtZero: true }
                }
            }
        });
    </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8" />
    <title>Complex HTML Rendering PDF Test</title>

    <!-- TailwindCSS CDN -->
    <script src="https://cdn.tailwindcss.com"></script>

    <!-- Google Fonts -->
    <link href="https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@500&family=Open+Sans:wght@400;700&display=swap" rel="stylesheet" />

    <!-- Chart.js -->
    <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>

    <style>
        body {
            font-family: 'Open Sans', sans-serif;
        }
        .custom-gradient {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        @media print {
            .no-print { display: none; }
        }
    </style>
</head>
<body class="bg-gray-100 p-10 text-gray-900">

    <!-- Header with gradient -->
    <header class="custom-gradient text-white p-8 rounded-lg shadow-md text-center">
        <h1 class="text-4xl font-bold">PDF Rendering Stress Test</h1>
        <p class="mt-2 text-xl">Fonts, layout, charts, JavaScript & TailwindCSS in one document.</p>
    </header>

    <!-- Grid layout -->
    <section class="mt-10 grid grid-cols-1 md:grid-cols-2 gap-6">
        <div class="bg-white p-6 rounded shadow border">
            <h2 class="text-2xl font-semibold text-purple-700 mb-4">CSS Grid & Responsive Design</h2>
            <p class="text-gray-700 mb-2">Resize this section, and media queries adapt layout dynamically. Tailwind’s utility classes provide granular styling control.</p>
            <ul class="list-disc list-inside text-sm text-gray-600">
                <li>Flexbox & Grid</li>
                <li>Media Queries</li>
                <li>Box Shadows & Borders</li>
                <li>Web Fonts & Gradients</li>
            </ul>
        </div>

        <!-- JavaScript-rendered block -->
        <div class="bg-white p-6 rounded shadow border">
            <h2 class="text-2xl font-semibold text-green-700 mb-4">JavaScript Rendered Content</h2>
            <p class="text-gray-700 mb-2" id="js-output">[Loading dynamic content...]</p>
            <p class="text-xs text-gray-400">(This content will change on load via JavaScript)</p>
        </div>
    </section>

    <!-- Chart.js Chart -->
    <section class="mt-10 bg-white p-6 rounded shadow border">
        <h2 class="text-2xl font-semibold text-blue-600 mb-4">Real-Time Chart</h2>
        <canvas id="myChart" width="400" height="200"></canvas>
        <p class="text-sm text-gray-500 mt-2">This chart is dynamically rendered using JavaScript and Canvas.</p>
    </section>

    <!-- SVG and Icons -->
    <section class="mt-10 bg-white p-6 rounded shadow border flex flex-col md:flex-row items-center gap-6">
        <div>
            <h2 class="text-2xl font-semibold text-pink-600 mb-2">SVG Support</h2>
            <svg width="100" height="100" viewBox="0 0 100 100">
                <circle cx="50" cy="50" r="40" stroke="#f472b6" stroke-width="6" fill="#fdf2f8" />
            </svg>
        </div>
        <div>
            <h2 class="text-2xl font-semibold text-indigo-700 mb-2">Typography Test</h2>
            <p class="font-['Roboto_Slab'] text-xl">Roboto Slab – Header Style</p>
            <p class="font-['Open_Sans'] text-base mt-1">Open Sans – Body Text</p>
        </div>
    </section>

    <!-- Footer -->
    <footer class="mt-16 text-center text-sm text-gray-500 no-print">
        Rendered using TailwindCSS + JavaScript + HTML5 | © Test Suite 2025
    </footer>

    <!-- JavaScript for dynamic test and chart -->
    <script>
        // JavaScript dynamic rendering
        window.addEventListener('DOMContentLoaded', () => {
            setTimeout(() => {
                document.getElementById('js-output').textContent = 'JavaScript content successfully rendered!';
            }, 1000);
        });

        // Chart.js render
        const ctx = document.getElementById('myChart').getContext('2d');
        const myChart = new Chart(ctx, {
            type: 'bar',
            data: {
                labels: ['IronPDF', 'PDFCrowd'],
                datasets: [{
                    label: 'Render Speed (ms)',
                    data: [300, 1200],
                    backgroundColor: ['#6366f1', '#f59e0b'],
                }]
            },
            options: {
                scales: {
                    y: { beginAtZero: true }
                }
            }
        });
    </script>
</body>
</html>

This file aims to test how IronPDF and PDFcrowd handle:

• Google Fonts (multiple styles)
• Gradients, shadows, complex layout
• TailwindCSS utility classes
• Dynamic JavaScript rendering
• Chart.js embedded charts
• SVGs and web icons
• Responsive design with media queries

Results

Output Comparison

IronPDF makes it effortless to convert this HTML into a professional-grade PDF document with minimal setup. Here's how:

• Accepts raw HTML strings, files, or Razor views
• Supports dynamic placeholders using @model, string interpolation, or templating engines
• Automatically paginates content across multiple pages
• Provides full support for CSS styling, headers/footers, and JavaScript execution
• Offers output as file, byte array, or HTTP stream—ideal for both web apps and background services

IronPDF Code Example

using IronPdf;

var html = File.ReadAllText("invoice_template.html");

// Inject dynamic values
html = html.Replace("{{InvoiceNumber}}", "INV-1001")
           .Replace("{{InvoiceDate}}", DateTime.Now.ToShortDateString())
           .Replace("{{DueDate}}", DateTime.Now.AddDays(30).ToShortDateString())
           .Replace("{{CustomerName}}", "Jane Doe")
           .Replace("{{CustomerAddress}}", "1234 Elm St, Springfield, IL")
           .Replace("{{LineItems}}", @"
               <tr><td>Consulting</td><td>10</td><td>100</td><td>1,000</td></tr>
               <tr><td>Development</td><td>15</td><td>100</td><td>1,500</td></tr>")
           .Replace("{{Subtotal}}", "2,500")
           .Replace("{{Tax}}", "250")
           .Replace("{{Total}}", "2,750");

var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs("filled-invoice.pdf");

using IronPdf;

var html = File.ReadAllText("invoice_template.html");

// Inject dynamic values
html = html.Replace("{{InvoiceNumber}}", "INV-1001")
           .Replace("{{InvoiceDate}}", DateTime.Now.ToShortDateString())
           .Replace("{{DueDate}}", DateTime.Now.AddDays(30).ToShortDateString())
           .Replace("{{CustomerName}}", "Jane Doe")
           .Replace("{{CustomerAddress}}", "1234 Elm St, Springfield, IL")
           .Replace("{{LineItems}}", @"
               <tr><td>Consulting</td><td>10</td><td>100</td><td>1,000</td></tr>
               <tr><td>Development</td><td>15</td><td>100</td><td>1,500</td></tr>")
           .Replace("{{Subtotal}}", "2,500")
           .Replace("{{Tax}}", "250")
           .Replace("{{Total}}", "2,750");

var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderHtmlAsPdf(html);
pdf.SaveAs("filled-invoice.pdf");

Imports IronPdf

Private html = File.ReadAllText("invoice_template.html")

' Inject dynamic values
html = html.Replace("{{InvoiceNumber}}", "INV-1001").Replace("{{InvoiceDate}}", DateTime.Now.ToShortDateString()).Replace("{{DueDate}}", DateTime.Now.AddDays(30).ToShortDateString()).Replace("{{CustomerName}}", "Jane Doe").Replace("{{CustomerAddress}}", "1234 Elm St, Springfield, IL").Replace("{{LineItems}}", "
               <tr><td>Consulting</td><td>10</td><td>100</td><td>1,000</td></tr>
               <tr><td>Development</td><td>15</td><td>100</td><td>1,500</td></tr>").Replace("{{Subtotal}}", "2,500").Replace("{{Tax}}", "250").Replace("{{Total}}", "2,750")

Dim renderer = New ChromePdfRenderer()
Dim pdf = renderer.RenderHtmlAsPdf(html)
pdf.SaveAs("filled-invoice.pdf")

输出

Stream the PDF in a Web API:

var pdfStream = pdf.Stream;
return File(pdfStream, "application/pdf", "invoice.pdf");

var pdfStream = pdf.Stream;
return File(pdfStream, "application/pdf", "invoice.pdf");

Dim pdfStream = pdf.Stream
Return File(pdfStream, "application/pdf", "invoice.pdf")

Whether you're serving this in an MVC controller or inside an API endpoint, IronPDF’s rendering engine ensures the PDF looks exactly as intended, with responsive layout and accurate page breaks.

PDFCrowd uses a cloud-based rendering engine and requires either a static HTML file or an inline HTML string. It’s more limited, especially when dealing with long or dynamic documents.

• Requires building full HTML content manually as a string
• Pagination support is CSS-only with no dynamic layout management
• Header and footer elements are static and inconsistent across pages
• JavaScript execution has limitations (short delays only, no multi-pass execution)
• No Razor view rendering support

PDFCrowd Code Example

using pdfcrowd;

string html = $@"
<!DOCTYPE html>
<html>
<head>
  <meta charset='UTF-8'>
  <title>Invoice</title>
  <style>
    body {{ font-family: Arial; font-size: 12pt; }}
    .header, .footer {{ text-align: center; margin: 10px 0; }}
    table {{ width: 100%; border-collapse: collapse; margin-top: 20px; }}
    th, td {{ padding: 8px; border: 1px solid #ccc; }}
    th {{ background-color: #f4f4f4; }}
    .total-row {{ font-weight: bold; }}
  </style>
</head>
<body>
  <div class='header'>
    <h1>INVOICE</h1>
    <p><strong>Invoice #: </strong>INV-1001<br>
       <strong>Invoice Date: </strong>{DateTime.Now.ToShortDateString()}<br>
       <strong>Due Date: </strong>{DateTime.Now.AddDays(30).ToShortDateString()}</p>
  </div>

  <p><strong>Billed To:</strong><br>Jane Doe<br>1234 Elm St, Springfield, IL</p>

  <table>
    <thead>
      <tr>
        <th>Description</th><th>Hours</th><th>Rate</th><th>Amount</th>
      </tr>
    </thead>
    <tbody>
      <tr><td>Consulting</td><td>10</td><td>100</td><td>1,000</td></tr>
      <tr><td>Development</td><td>15</td><td>100</td><td>1,500</td></tr>
    </tbody>
  </table>

  <p class='total-row'>Subtotal: 2,500<br>
  Tax (10%): 250<br>
  <strong>Total: 2,750</strong></p>

  <div class='footer'>Thank you for your business!</div>
</body>
</html>";

pdfcrowd.HtmlToPdfClient client =
                new pdfcrowd.HtmlToPdfClient("demo", "ce544b6ea52a5621fb9d55f8b542d14d");

client.convertStringToFile(html, "filled-invoice.pdf");

using pdfcrowd;

string html = $@"
<!DOCTYPE html>
<html>
<head>
  <meta charset='UTF-8'>
  <title>Invoice</title>
  <style>
    body {{ font-family: Arial; font-size: 12pt; }}
    .header, .footer {{ text-align: center; margin: 10px 0; }}
    table {{ width: 100%; border-collapse: collapse; margin-top: 20px; }}
    th, td {{ padding: 8px; border: 1px solid #ccc; }}
    th {{ background-color: #f4f4f4; }}
    .total-row {{ font-weight: bold; }}
  </style>
</head>
<body>
  <div class='header'>
    <h1>INVOICE</h1>
    <p><strong>Invoice #: </strong>INV-1001<br>
       <strong>Invoice Date: </strong>{DateTime.Now.ToShortDateString()}<br>
       <strong>Due Date: </strong>{DateTime.Now.AddDays(30).ToShortDateString()}</p>
  </div>

  <p><strong>Billed To:</strong><br>Jane Doe<br>1234 Elm St, Springfield, IL</p>

  <table>
    <thead>
      <tr>
        <th>Description</th><th>Hours</th><th>Rate</th><th>Amount</th>
      </tr>
    </thead>
    <tbody>
      <tr><td>Consulting</td><td>10</td><td>100</td><td>1,000</td></tr>
      <tr><td>Development</td><td>15</td><td>100</td><td>1,500</td></tr>
    </tbody>
  </table>

  <p class='total-row'>Subtotal: 2,500<br>
  Tax (10%): 250<br>
  <strong>Total: 2,750</strong></p>

  <div class='footer'>Thank you for your business!</div>
</body>
</html>";

pdfcrowd.HtmlToPdfClient client =
                new pdfcrowd.HtmlToPdfClient("demo", "ce544b6ea52a5621fb9d55f8b542d14d");

client.convertStringToFile(html, "filled-invoice.pdf");

Imports pdfcrowd

Private html As String = $"
<!DOCTYPE html>
<html>
<head>
  <meta charset='UTF-8'>
  <title>Invoice</title>
  <style>
    body {{ font-family: Arial; font-size: 12pt; }}
    .header, .footer {{ text-align: center; margin: 10px 0; }}
    table {{ width: 100%; border-collapse: collapse; margin-top: 20px; }}
    th, td {{ padding: 8px; border: 1px solid #ccc; }}
    th {{ background-color: #f4f4f4; }}
    .total-row {{ font-weight: bold; }}
  </style>
</head>
<body>
  <div class='header'>
    <h1>INVOICE</h1>
    <p><strong>Invoice #: </strong>INV-1001<br>
       <strong>Invoice Date: </strong>{DateTime.Now.ToShortDateString()}<br>
       <strong>Due Date: </strong>{DateTime.Now.AddDays(30).ToShortDateString()}</p>
  </div>

  <p><strong>Billed To:</strong><br>Jane Doe<br>1234 Elm St, Springfield, IL</p>

  <table>
    <thead>
      <tr>
        <th>Description</th><th>Hours</th><th>Rate</th><th>Amount</th>
      </tr>
    </thead>
    <tbody>
      <tr><td>Consulting</td><td>10</td><td>100</td><td>1,000</td></tr>
      <tr><td>Development</td><td>15</td><td>100</td><td>1,500</td></tr>
    </tbody>
  </table>

  <p class='total-row'>Subtotal: 2,500<br>
  Tax (10%): 250<br>
  <strong>Total: 2,750</strong></p>

  <div class='footer'>Thank you for your business!</div>
</body>
</html>"

Private client As New pdfcrowd.HtmlToPdfClient("demo", "ce544b6ea52a5621fb9d55f8b542d14d")

client.convertStringToFile(html, "filled-invoice.pdf")

输出

While simple and quick for small documents, PDFCrowd’s lack of intelligent layout management and dynamic templating makes it harder to scale for real-world invoice scenarios.

IronPDF follows a perpetual licensing model that emphasizes ownership and operational freedom. Rather than charging you per document or monthly usage, IronPDF gives you a one-time license that unlocks full functionality, with options to expand or extend support as needed.

License Types & Pricing

• Offers multiple tiers: Lite, Plus, and Professional, each with increasing levels of features and redistribution rights.

• Pricing starts at $799 USD for a developer license and scales based on:

  • Number of developers

  • Deployment locations or projects

  • Redistributable rights (included in Plus and above)
• Also available as part of the Iron Suite, which bundles all 9 Iron Software libraries (OCR, Barcode, Excel, etc.) for full-stack document automation.

Updates and Support

• Every license includes:

  • 1 year of updates (feature upgrades, security patches)

  • 24/5 developer support for implementation or troubleshooting
• After the first year, you can optionally renew support and updates starting at around $249–$1,199/year, depending on your tier.

Flexibility & Deployment Rights

• No runtime dependencies, no telemetry, and no call-home behavior

• Licenses are valid across development, staging, and production environments

• You can deploy to:

  • On-prem servers

  • Docker containers

  • CI/CD pipelines

  • Offline or air-gapped systems

Best Fit For

• Development teams that prefer one-time purchases over subscriptions

• ISVs and OEMs building SaaS apps or distributable desktop tools

• Enterprises with stringent procurement, IP, or compliance requirements

PDFCrowd takes a cloud-first, subscription-based API model that’s easy to get started with—but comes with trade-offs in scalability and long-term cost control.

License Types & Pricing

• Offers API access tiers based on monthly usage:

  • Free tier includes watermarked output and request limits

  • Paid tiers start at $9/month for 100 conversions

  • Usage measured by:

  • Number of pages

  • File size (MB)

  • API requests
• Quota overages are billed separately, which can increase costs under heavy load or burst traffic.

Restrictions and Deployment Limitations

• Cannot be deployed on-premises or redistributed
• Output generation only occurs in the cloud (via HTTP API)
• No installation or offline rendering option
• API keys must remain active and funded for continued functionality

Best Fit For:

• Low-volume or early-stage projects needing quick HTML-to-PDF conversion
• Teams prioritizing OPEX and cloud-based infrastructure
• One-off or short-term PDF generation needs

The Problem with PDFCrowd:

PDFCrowd is a cloud-only service. All document conversions must be sent over the internet via its API. This can be a dealbreaker in situations where:

• Your app runs in air-gapped or offline environments (e.g., secure government, defense, or financial systems)

• You’re restricted by data privacy regulations (GDPR, HIPAA)

• You're deploying to CI/CD pipelines without guaranteed internet access

• Your company policies prohibit third-party cloud dependencies

Even temporary outages or latency can impact reliability, testing, or delivery timelines.

IronPDF’s Advantage:

IronPDF runs fully offline, with no dependency on external servers or call-home behavior. It’s deployable to:

• Local development environments

• Secure intranets and firewalled production servers

• Docker containers or Kubernetes clusters

• CI/CD pipelines on GitHub Actions, Azure DevOps, and more

IronPDF puts you in full control—so your documents never leave your infrastructure.

The Problem with PDFCrowd:

Because PDFCrowd uses its own custom rendering engine—not Chromium—it struggles with complex layouts and modern front-end technologies. Common complaints include:

• Missing fonts, incorrect text rendering

• Broken layouts on responsive pages

• Unsupported CSS/JavaScript features

• Inconsistent handling of media queries, @font-face, or dynamic DOM changes

For developers generating brand-sensitive documents like invoices, proposals, or marketing material, this can result in off-brand or unusable PDFs.

IronPDF’s Advantage:

IronPDF uses a Chromium-based rendering engine, the same core used by the Chrome browser. This ensures:

• Pixel-perfect output that mirrors what you see in the browser

• Full support for JavaScript, CSS3, web fonts, and even animations

• Accurate rendering of dashboards, dynamic content, and single-page apps (SPAs)

If it works in Chrome, it works in IronPDF. That’s a promise many devs rely on for consistent, production-ready documents.

The Problem with PDFCrowd:

PDFCrowd’s usage-based pricing model may look affordable at first—but can quickly balloon as usage grows:

• API quotas are capped based on pages/month or MB/month

• Overages are charged separately, often at a higher rate

• There’s no "unlimited" tier—meaning you’re always budgeting based on estimates

This becomes especially problematic when you're:

• Scaling a SaaS platform with fluctuating workloads

• Running batch operations for internal reporting or archiving

• Supporting multi-tenant systems or multiple clients

Budgeting becomes a game of guesswork, and usage spikes can catch teams off-guard.

IronPDF’s Advantage:

IronPDF uses a fixed-cost perpetual license, which includes:

• Unlimited document generation

• No runtime metering or hidden costs

• Scalability across multiple servers or containers (with appropriate licensing)

You pay once—and can scale with confidence. Whether you’re printing one invoice or 10,000 reports, IronPDF’s cost stays the same.

The Problem with PDFCrowd:

PDFCrowd’s layout customization is limited and not developer-friendly:

• Headers and footers are static HTML only—no page numbers, no date injection

• Page breaks are difficult to control, often splitting content mid-paragraph

• No support for custom page size, orientation, or dynamic layout logic

This lack of control creates frustration for developers building:

• Legal documents with formal pagination

• Financial reports with grouped summaries

• Branded templates with precise layout needs

IronPDF’s Advantage:

IronPDF offers full programmatic control over layout and pagination:

• Add dynamic headers/footers with page numbers, titles, dates, and custom variables

• Use CSS page breaks (break-before, page-break-inside) to control flow

• Customize:

  • Page size and orientation

  • Margins, spacing, and bleed

  • First-page or last-page layout logic

It’s ideal for generating reports, statements, e-books, or any multi-page professional document—with full fidelity and flexibility.