Compare/IronPDF

PDFluent vs IronPDF

IronPDF bundles a headless Chromium instance to render HTML to PDF. That makes the package large, slow to start, and unsuitable for WASM or serverless.

IronPDF is a .NET library that converts HTML to PDF by driving a headless Chromium browser. It works well for HTML-to-PDF workflows. The tradeoff is package size (~150 MB), a slow cold start, and no support for WASM or low-memory environments. PDFluent is a native Rust library with a ~6 MB WASM binary (~2 MB Brotli-compressed) and a <30 ms cold start.

Side-by-side

PDFluent (Rust)
use pdfluent::Document;

fn main() -> pdfluent::Result<()> {
    let doc = Document::open("report.pdf")?;

    let page_count = doc.page_count();
    println!("Pages: {}", page_count);

    // Extract text from all pages
    for i in 0..page_count {
        let text = doc.page(i)?.extract_text()?;
        println!("--- Page {} ---
{}", i + 1, text);
    }

    Ok(())
}
IronPDF (C#)
using IronPdf;

class Program {
    static void Main(string[] args) {
        // IronPDF requires a Chromium binary on first run (~150 MB download)
        var renderer = new ChromePdfRenderer();

        // Convert HTML to PDF (IronPDF's primary use case)
        var pdf = renderer.RenderHtmlAsPdf("<h1>Report</h1><p>Content here</p>");
        pdf.SaveAs("report.pdf");

        // Open existing PDF
        var doc = PdfDocument.FromFile("report.pdf");
        Console.WriteLine($"Pages: {doc.PageCount}");

        // Text extraction is limited compared to native PDF libraries
        var text = doc.ExtractAllText();
        Console.WriteLine(text);
    }
}

Feature comparison

FeaturePDFluentIronPDF
Language / runtimeRust, no runtimeC# / .NET + Chromium
Binary size~6 MB WASM (~2 MB Brotli)~150 MB (includes Chromium)
Cold start< 10 ms2–5 s (Chromium launch)
WASM / browser support
Serverless / Docker friendly
Native PDF parsing (no browser)
PDF/A validation
Published pricing

Pros and cons

PDFluent
  • ~6 MB binary (~2 MB Brotli) vs ~150 MB IronPDF (with Chromium)
  • No browser process to manage or license
  • Works in AWS Lambda without custom layers
  • Native PDF parsing — not limited by what Chromium can render
  • PDF/A validation and digital signatures natively supported
  • No built-in HTML-to-PDF — PDFluent focuses on native PDF operations
  • C# developers need to use bindings or switch language
  • Younger product with less third-party integration documentation
IronPDF
  • Excellent HTML-to-PDF fidelity via Chromium rendering
  • Well-documented .NET API
  • Active community and many Stack Overflow answers
  • Includes a full Chromium binary (~150 MB) in every deployment
  • 2-5 second cold start due to Chromium launch
  • Cannot run in standard Lambda (package size limits)
  • Limited native PDF manipulation compared to pure PDF libraries
  • Per-developer annual licensing

When to use each

Choose PDFluent

PDFluent is the right pick when you need to read, edit, sign, or extract data from existing PDFs at scale. It runs anywhere — Lambda, Docker, Cloudflare Workers, or the browser via WASM — with a tiny deployment footprint.

Choose IronPDF

IronPDF is a strong choice when your primary workflow is converting HTML documents (invoices, reports, dashboards) to PDF inside a .NET application where cold start time and binary size are not constraints.

Bottom line

IronPDF is a reasonable pick if your workflow is HTML-to-PDF in a .NET monolith where startup time and image size are not concerns. It is a poor fit for serverless, WASM, or any environment where a 150 MB Chromium dependency is a problem. PDFluent handles native PDF read/write workloads without a browser runtime.

Frequently asked questions

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