PDFluent vs IronPDF

IronPDF bundles a headless Chromium instance to render HTML to PDF. That makes it 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 and no support for WASM or low-memory environments. PDFluent is a native Rust library with a WASM package: @pdfluent/sdk-wasm 1.0.0 is 3.8 MB with Brotli (measured 2026-09-16).

Side-by-side

PDFluent
Rust
use pdfluent::PdfDocument;

fn main() -> pdfluent::Result<()> {
    let doc = PdfDocument::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)?.text()?;
        println!("--- Page {} ---
{}", i + 1, text);
    }

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

class Program {
    static void Main(string[] args) {
        // IronPDF requires a Chromium binary (downloaded on first run)
        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 sizeWASM: 3.8 MB Brotli, 15.3 MB unpacked (1.0.0, B07, 2026-09-16)Ships a full Chromium binary
Cold startNo runtime to start; opening a file: 1.7 ms median on one MacBook (A22, 2026-08-24)Chromium launch precedes the first render
WASM / browser support
Serverless / Docker friendly
Native PDF parsing (no browser)
PDF/A validation
Published pricing

Pros and cons

PDFluent

  • 3.8 MB Brotli WASM engine (1.0.0, 2026-09-16) against a deployment that carries 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
  • Bundles a full Chromium binary in every deployment
  • Cold starts are slower because Chromium must 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 on Lambda, Docker, Cloudflare Workers, or in the browser via WASM.

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 or WASM. PDFluent handles native PDF read/write workloads without a browser runtime.

Frequently asked questions

Why does IronPDF use Chromium?
IronPDF renders HTML to PDF by driving a headless Chrome instance. This gives accurate HTML/CSS rendering but means the package includes the full Chromium binary and requires a compatible OS environment.
Can IronPDF run in AWS Lambda?
It is difficult. The Chromium binary requires specific Linux libraries, and the package size exceeds Lambda layer limits without custom container images. PDFluent has no native dependencies and fits in a standard Lambda deployment.
Does PDFluent support HTML to PDF?
PDFluent focuses on native PDF operations: reading, writing, forms, annotations, and text. HTML-to-PDF conversion is not in scope for the core library.
How does pricing compare?
IronPDF uses per-developer annual licensing. PDFluent never counts developers: €999 a year covers a whole organisation, and OEM use is priced per product. The AGPL build is free and complete.
SDK · Install

Try it on your own files.

Free under the AGPLv3, or a commercial licence if you would rather not publish your own source.