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.

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

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Install-Package IronPdf

Nächster Schritt: Kostenlose Testversion starten

Vollständig funktionsfähig ohne Wasserzeichen

30-Tage-Testversion - keine Kreditkarte erforderlich

Nächster Schritt: Kostenlose Testversion starten

Vollständig funktionsfähig ohne Wasserzeichen

30-Tage-Testversion - keine Kreditkarte erforderlich

Install

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

Start Free Trial

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

No credit card required

Go Live

See your PDF workflow
running in a live
production project.

PM > Install-Package IronPdf

IronPDF

See what’s new:

Reduced memory growth by ~97%

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 Versionen:

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

Betriebssystem & Prozessoren:

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

.NET-Projekttypen:

Web (Blazor & WebForms)
Desktop (WPF & MAUI)
Konsole (App & Bibliothek)

App-Umgebungen:

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

IDEs:

Microsoft Visual Studio
JetBrains Rider & ReSharper

Binärzertifizierung

DigiCert signierte Binärdateien

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.

Erhalten Sie sofort Ihren kostenlosen 30-Tage-Testschlüssel.

Ihr Testschlüssel sollte in der E-Mail sein.
Wenn nicht, kontaktieren Sie bitte
support@ironsoftware.com

Everything you need for PDF editing in C#

View Full Features Set

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

40%EINSPARUNGEN

Wo wir in der Vergangenheit ein Plug-in oder ein Paket für OCR verwenden mussten und ein anderes für PDFs, war es für uns wirklich großartig, alles in einem kostengünstigen Paket integriert zu haben.

David Jones Leitender Software-Ingenieur Lesen Sie die Fallstudie

Bg Chart Green related to Edit PDF in C#
Inside the Page, Not Just the Page Order EINSPARUNGEN20%

Green2View erzielte 20 % Einsparungen, 30 % schnellere Dokumentenbearbeitung und 100 % Compliance.

Lesen Sie die Fallstudie

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Inside the Page, Not Just the Page Order WENIGER ADMIN-ARBEIT40%

Es funktioniert einfach - die automatisierte PDF-Erstellung liefert jedes Mal pixelgenaue Finanzberichte.

Lesen Sie die Fallstudie

Das Vertrauen von Millionen von Ingenieuren weltweit

Jedes Mal, wenn Entwickler fragen, lautet die Antwort JA! vonIronPDF

switch(faqQuestions)
{ 
    case "Can I deploy my application using the library to Linux, macOS, or Windows, including Docker containers?": return "YES";
    case "Can I render pixel-perfect PDFs from complex HTML5, CSS3, and JavaScript?": return "YES";
    case "Is the library thread-safe for use in highly concurrent, multi-threaded server applications and APIs?": return "YES";
    case "Can I set custom viewport dimensions and print media CSS to control responsive layouts?": return "YES";
    case "Is IronPDF compatible with Azure Functions?": return "YES";
    case "Can I permanently redact sensitive text and images from PDF documents?": return "YES";
    case "Can I generate a PDF from a URL that requires authentication via custom headers, cookies, or form logins?": return "YES";
    case "Can I access PDF DOM through ObjectModel property?": return "YES";
    case "Can I programmatically fill, read, and flatten interactive AcroForm?": return "YES";
    case "Does it support generating PDF/A and PDF/UA compliant documents for archiving and accessibility standards?": return "YES";
    case "Can I secure a document with 256-bit AES password encryption and set user permissions?": return "YES";
    case "Can I apply and verify digital signatures on a PDF using X.509 certificates?": return "YES";
    case "Can I test IronPDF in my live project for free now?": return "YES, click here to start your 30-day free trial";
}

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

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Inside the Page, Not Just the Page Order

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

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