Edit PDF in C#
Inside the Page, Not Just the Page Order

Open a PDF that already exists and change what is actually on it. Find and replace text, redact it permanently, stamp, watermark, annotate, draw text and bitmaps, add headers, footers and page numbers, extract text and images, and translate, scale, or remove individual objects on the page. Thirteen editing operations through one .NET API — no Acrobat automation, no Office interop, no content-stream surgery. Runs on .NET 10, 9, 8, Framework, Core, and Standard.

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Total downloads 20,389,208 Licensing

Load any existing PDF and edit it in place — find and replace text, redact, extract text and images
Move, scale, or delete individual objects on the page — content-level editing, not merge-and-split
Overlay anything: stamps, custom watermarks, annotations, drawn text and bitmaps, backgrounds and foregrounds, headers, footers, page numbers
Free 30-day trial, no watermarks, no credit card

Edit PDF

Online Demo See All Code Examples

using IronPdf;
using IronPdf.Editing;

// Start from a file that already exists — nothing is re-generated
PdfDocument pdf = PdfDocument.FromFile("contract.pdf");

// Change the text that is already in the document
pdf.ReplaceTextOnAllPages("[CLIENT_NAME]", "Northwind Traders");

// Redact — the characters are removed, not just covered over
pdf.RedactTextOnAllPages("Account No. 4417-9920");

// Overlay an approval mark on page 1
pdf.ApplyStamp(new HtmlStamper("<h2>APPROVED</h2>")
{
    HorizontalAlignment = HorizontalAlignment.Right,
    VerticalAlignment   = VerticalAlignment.Top
}, 0);

// Number every page
pdf.AddTextFooters(new TextHeaderFooter
{
    CenterText = "Page {page} of {total-pages}"
});

pdf.SaveAs("contract-final.pdf");
// No Acrobat. No Office interop. No content-stream surgery.

using IronPdf;
using IronPdf.Editing;

// Start from a file that already exists — nothing is re-generated
PdfDocument pdf = PdfDocument.FromFile("contract.pdf");

// Change the text that is already in the document
pdf.ReplaceTextOnAllPages("[CLIENT_NAME]", "Northwind Traders");

// Redact — the characters are removed, not just covered over
pdf.RedactTextOnAllPages("Account No. 4417-9920");

// Overlay an approval mark on page 1
pdf.ApplyStamp(new HtmlStamper("<h2>APPROVED</h2>")
{
    HorizontalAlignment = HorizontalAlignment.Right,
    VerticalAlignment   = VerticalAlignment.Top
}, 0);

// Number every page
pdf.AddTextFooters(new TextHeaderFooter
{
    CenterText = "Page {page} of {total-pages}"
});

pdf.SaveAs("contract-final.pdf");
// No Acrobat. No Office interop. No content-stream surgery.

PM >

Install-Package IronPdf

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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 editing API is fully managed and behaves identically everywhere — the same find-and-replace, the same redaction, the same object edits, whether the job runs on a Windows box, in a Linux container, or inside a serverless function. Nothing here depends on desktop software being installed on the machine.

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

Most .NET libraries edit pages. This one edits what is on them.

Most .NET tools that say "edit" mean merge, split, and rotate. The generation-first libraries cannot open your file at all; the low-level free ones can, but replacing a line of text means rewriting content streams by hand. IronPDF edits inside the page: find and replace, redact, extract text and images, translate, scale, or remove objects, stamp, watermark, annotate, draw, set backgrounds, and add headers, footers and page numbers — one managed .NET API, no Acrobat, no Office interop.

Get your free 30-day Trial Key instantly.

Everything you need for PDF editing in C#

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?

Edit any PDF on any server — no Acrobat licence, no Office interop, no COM objects to keep alive.

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
, then PdfDocument.FromFile("yours.pdf") — one line from editing. Replace text, redact, stamp, watermark, annotate, move or delete objects, add headers and page numbers, all named the way you would describe the task out loud.
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.

Chat With an Engineer

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 • 14M+ 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

Can I open a PDF I did not create and edit the text inside it?YES!

Does redaction actually remove the text, or just draw a black box over it?REMOVES IT

Can I move, resize, or delete individual objects on a page?YES!

Do I need Adobe Acrobat, Word, or any Office interop installed on the server?NO

Can I add headers, footers, page numbers, watermarks, stamps, and annotations to an existing file?YES!

Will editing a PDF re-flow or degrade the rest of the document?NO

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

Talk to an Expert

20 Million NuGet Installs and Only Accelerating

20M+2026

Nuget download historical chart over 12 million downloads in 2025

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Nuget Downloads 20,389,208|Version:2026.8just released