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).
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(())
}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 | PDFluent | IronPDF |
|---|---|---|
| Language / runtime | Rust, no runtime | C# / .NET + Chromium |
| Binary size | WASM: 3.8 MB Brotli, 15.3 MB unpacked (1.0.0, B07, 2026-09-16) | Ships a full Chromium binary |
| Cold start | No 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 |
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.
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 or WASM. PDFluent handles native PDF read/write workloads without a browser runtime.
Free under the AGPLv3, or a commercial licence if you would rather not publish your own source.