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.
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(())
}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 | PDFluent | IronPDF |
|---|---|---|
| Language / runtime | Rust, no runtime | C# / .NET + Chromium |
| Binary size | ~6 MB WASM (~2 MB Brotli) | ~150 MB (includes Chromium) |
| Cold start | < 10 ms | 2–5 s (Chromium launch) |
| WASM / browser support | ||
| Serverless / Docker friendly | ||
| Native PDF parsing (no browser) | ||
| PDF/A validation | ||
| Published pricing |
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.
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.
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.
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