The Complete .NET PDF Library —
Without the Free-Package Tax

Generate PDFs from HTML, then edit, merge, watermark, sign, and secure them — from one library, one API, one licence. No fluent layout code to hand-write, no AGPL obligations, no stitching together three free packages that were never meant to work as a set. Runs on .NET 10, 9, 8, Framework, Core, and Standard.

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One library for generate, edit, merge, watermark, sign, and secure — not three free packages bolted together
Generate from HTML, CSS3, and JS with a Chromium engine — no fluent layout code to hand-write
A commercial licence with no copyleft strings and 24/5 engineer support
Free 30-day trial, no watermarks, no credit card

.NET PDF Library

Online Demo See All Code Examples

using IronPdf;

// One .NET library: generate, then edit, merge, and sign
var renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Report</h1>");
PdfDocument cover = PdfDocument.FromFile("cover.pdf");

PdfDocument merged = PdfDocument.Merge(cover, pdf);
merged.SecuritySettings.OwnerPassword = "secret";
merged.SaveAs("final.pdf");

// No second package for the merge. No third for the password.

using IronPdf;

// One .NET library: generate, then edit, merge, and sign
var renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Report</h1>");
PdfDocument cover = PdfDocument.FromFile("cover.pdf");

PdfDocument merged = PdfDocument.Merge(cover, pdf);
merged.SecuritySettings.OwnerPassword = "secret";
merged.SaveAs("final.pdf");

// No second package for the merge. No third for the password.

Imports IronPdf

' One .NET library: generate, then edit, merge, and sign
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Report</h1>")
Dim cover As PdfDocument = PdfDocument.FromFile("cover.pdf")

Dim merged As PdfDocument = PdfDocument.Merge(cover, pdf)
merged.SecuritySettings.OwnerPassword = "secret"
merged.SaveAs("final.pdf")

' No second package for the merge. No third for the password.

PM >Install-Package IronPdf

Install-Package IronPdf

NEWInstallStart Free TrialGo Live

Install

Copy the NuGet
command above - ready
in about 5 minutes.

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Test in production without watermarks and 30 days fully
functional product. 24/5 technical support during trial

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Go Live

See your PDF workflow
running in a live
production project.

See what’s new:PDF Optional Content Groups

Cross Platform Support

The same single library runs identically on every supported platform — one dependency to test, deploy, and support, whether you ship to Windows, a Linux container, or a serverless function.

Designed for C#, F#, & VB.NET running on .NET 10, 9, 8, 7, 6, 5, Core, Standard, or Framework
Available for .NET, Java, Node.js, and Python.

.NET Versions:

C#, VB.NET, F# Languages
.NET Core (10, 9, 8, 7, 6, 5, and 3.1+)
.NET Standard (2.0+)
.NET Framework (4.6.2+)

OS & Processors:

Windows (x64, x86)
Mac (x64, ARM)
Linux (x64)

.NET Project Types:

Web (Blazor & WebForms)
Desktop (WPF & MAUI)
Console (App & Library)

App Environments:

Windows (10+, Server UI 2012+, Server Core 2022)
Linux (Ubuntu, Debian, CentOS, etc.)
Mac (macOS 10+)
Docker (Windows, Linux, Azure)
Azure (VPS, WebApp, Function)
AWS (EC2, Lambda)

IDEs:

Microsoft Visual Studio
JetBrains Rider & ReSharper

Binary Certification

DigiCert Signed Binaries

A free PDF library is rarely one library

Building a real PDF feature on free packages usually means assembling a stack: one library to render your HTML, another to edit or merge the result, a third to handle signatures or encryption. Each brings its own API to learn, its own licence to check, and its own maintenance risk — and they were never designed to work together. Some ask you to rebuild layout in C# by hand; some ship under copyleft licences that reach into your own source; some stopped being maintained years ago. IronPDF is one supported library that generates, edits, merges, signs, and secures behind a single clean .NET API, with a commercial licence and an engineer on the other end of the ticket.

Get your free 30-day Trial Key instantly.

Create PDFs

Design Perfect PDFs

Full PDF Customization

Standards Compliance

PDF Versions (1.2 - 1.7)
PDF/UA (PDF/UA-1)
PDF/A (1-3 b/a)

PDF Viewing and Printing

Convert PDFs

Versatile PDF Conversion

Dynamic Web Page to PDFs

Web Accessibility

Tailored PDF Conversion

Refine PDF Layout

Edit PDFs

Edit PDF Objects

Edit Document Text

Enhance PDF Design

Organize PDFs

Edit PDF Structure

Supplementary Organization

Sign and Secure PDFs

Ensure Authenticity

PDF Form Management

Document Safety

Others

Support Web Assets

Performance and Compression

Why IronPDF?

One library, one licence, one support desk — instead of a stack of free packages you assemble and maintain yourself.

Pixel-perfect rendering

Chromium-grade HTML/CSS/JS ➝ what you see in the browser is what’s in the PDF.
Fonts, SVGs, image, complex layouts - consistent across environment.
Handles header/footers, page number, margins, and pagination edge cases.

Outcome: Ship PDFs that match designs, not “close enough”.

Up & running in 5 mins

PM > Install-Package IronPdf
```
Install-Package IronPdf
```
and one dependency covers generate, edit, merge, watermark, sign, and secure
No second package to add, no third licence to reconcile, no glue code between libraries that disagree.
Instant licence key, full API access, and a commercial licence with no copyleft strings attached.

Outcome: One library installed, every PDF task covered.

Cross-platform

.NET 10, 9, 8 LTS, Framework 4.62+
OS: Windows, Linux, macOS.
Cloud/containers: Azure, AWS, Docker/Kubernetes, serverless.

Outcome: Works with your stack today and when you scale.

Great documentation

Copy-paste your first PDF
Task-based examples for HTML ➝ PDF, merge/split, stamping, forms, signing.
Troubleshooting for fonts, page breaks, headless/ cloud deploys.

Open Quickstart Docs

Perpetual license & 24/5 support

Perpetual license - buy once, use forever. Optional updates and renewals.
24/5 engineer support (24/7 in Premium) Real humans, median chat response <1 min
30-day money-back guarantee Not the right fit? Full refund, no questions.

30 days, fully-functional product

For builders

Features you'll actually use:
- merge/split
- TOC/bookmarks
- headers/footers/margins
- watermarks/stamps
- forms (fill/extract)
- attachments
- images
- permissions
- compressing
- digital signing
Works everywhere: Windows, Linux, macOS, Docker, Azure, AWS, cloud.

30 days, fully-functional product

For buyers

Trusted by 2M+ engineers • 20M+ NuGet installs.
Teams report 40% dev-time saved vs DIY/OSS wrappers.
Redistribution/SaaS options available.
Procurement-friendly: perpetual license, optional renewals, invoice available, multiple payment options (including local).
30-day money-back guarantee.

See Licensing

What our Customers say about IronPDF?

40%SAVING

Where in the past we might have to go out and use one plug-in or one package for OCR, and another one for PDF, having them all integrated into one low-cost package was really great for us.

David JonesLead Software EngineerRead the case study

Green2View savings chart SAVING20%

Green2view achieved 20% savings, 30% faster document turnaround, and 100% compliance.

Read the case study

WILLAN savings chart LESS ADMIN WORK40%

It just works—automated PDF generation delivers pixel-perfect financial reports every time.

Read the case study

Trusted by millions of engineers worldwide

Every time developers ask, it's a YES! from IronPDF

Does one IronPDF package cover generating, editing, merging, and signing, or do I need add-ons?ONE PACKAGE

Can I generate PDFs from HTML, CSS3, and JavaScript with browser-grade accuracy?YES!

Can I edit, merge, split, watermark, and encrypt existing PDFs with the same library?YES!

Will IronPDF's licence force me to open-source my application, the way AGPL libraries do?NO

Do I have to stitch together several free NuGet packages to get a full PDF workflow?NO

Is the library supported, with an engineer I can reach when something breaks?YES!

Can I render pixel-perfect PDFs from complex HTML5, CSS3, and JavaScript?YES!

Can I convert an HTML string to PDF in one line of C# code?YES!

Can I convert a URL to PDF with authentication, cookies, and custom headers?YES!

Can I generate a PDF from Razor, CSHTML, or ASPX views?YES!

Can I add custom headers, footers, page numbers, and watermarks during conversion?YES!

Can I run HTML to PDF conversion in Docker, Azure Functions, or AWS Lambda?YES!

Can I deploy my application using the library to Linux, macOS, or Windows, including Docker containers?YES!

Is the library thread-safe for use in highly concurrent, multi-threaded server applications and APIs?YES!

Can I set custom viewport dimensions and print media CSS to control responsive layouts?YES!

Is IronPDF compatible with Azure Functions?YES!

Can I permanently redact sensitive text and images from PDF documents?YES!

Can I generate a PDF from a URL that requires authentication via custom headers, cookies, or form logins?YES!

Can I access PDF DOM through ObjectModel property?YES!

Can I programmatically fill, read, and flatten interactive AcroForm?YES!

Does it support generating PDF/A and PDF/UA compliant documents for archiving and accessibility standards?YES!

Can I secure a document with 256-bit AES password encryption and set user permissions?YES!

Can I apply and verify digital signatures on a PDF using X.509 certificates?YES!

Can I test IronPDF in my live project for free now?YES! Click here to start your 30-day free trial

World-Class Engineering,
24-Hour Support

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20M+ NuGet Installs and Only Accelerating

20M+2026

20MillionNuGet Downloads

NuGet download historical chart over 20 million downloads in 2026

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Nuget Downloads 20,878,335|Version:2026.9just released

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Total downloads: 20,878,335

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