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.

무료 체험 시작하기 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 코드 예제 모두 보기

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

Install-Package IronPdf

NEWInstallStart Free TrialGo Live

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

Get 30-Day Trial KeyNo credit card required

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 버전:

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

운영체제 및 프로세서:

윈도우(x64, x86)
맥(x64, ARM)
리눅스(x64)

.NET 프로젝트 유형:

웹 (Blazor 및 웹폼)
데스크톱 (WPF 및 MAUI)
콘솔 (앱 및 라이브러리)

앱 환경:

윈도우 (10+, 서버 UI 2012+, 서버 코어 2022)
리눅스 (우분투, 데비안, 센토오스 등)
맥 (macOS 10 이상)
Docker (윈도우, 리눅스, Azure)
Azure (VPS, 웹 애플리케이션, 함수)
AWS (EC2, 람다)

IDEs:

마이크로소프트 Visual Studio
JetBrains Rider & ReSharper

바이너리 인증

DigiCert 서명 바이너리

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.

지금 바로 30일 무료 체험판 키를 받으세요.

Everything you need for PDF editing in C#

PDF 생성

완벽한 PDF 디자인

PDF 전체 맞춤 설정

표준 준수

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

PDF 보기 및 인쇄

PDF 변환

다용도 PDF 변환

동적 웹 페이지를 PDF로 변환

웹 접근성

맞춤형 PDF 변환

PDF 레이아웃 다듬기

PDF 편집

PDF 개체 편집

문서 텍스트 편집

PDF 디자인 개선

PDF 파일 정리하기

PDF 구조 편집

보조 조직

PDF에 서명하고 보안을 강화하세요

진위 여부를 확인하세요

PDF 양식 관리

문서 안전

기타

웹 자산 지원

성능 및 압축

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
```
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 • 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

IronPDF에 대한 고객들의 평가는 어떨까요?

40%절약

과거에는 OCR을 위해 별도의 플러그인이나 패키지를 사용하고, PDF를 위해서는 또 다른 플러그인이나 패키지를 사용해야 했지만, 이제 모든 기능이 하나의 저렴한 패키지에 통합되어 있어서 정말 좋았습니다.

데이비드 존스수석 소프트웨어 엔지니어사례 연구를 읽어보세요

그린2뷰 savings chart 절약20%

Green2view는 20%의 비용 절감, 30%의 문서 처리 시간 단축, 그리고 100% 규정 준수를 달성했습니다.

사례 연구를 읽어보세요

윌란 savings chart 관리 업무 감소40%

이 기능은 완벽하게 작동합니다. 자동 PDF 생성 기능을 통해 매번 픽셀 단위까지 완벽한 재무 보고서를 받아볼 수 있습니다.

사례 연구를 읽어보세요

전 세계 수백만 명의 엔지니어가 신뢰하는

개발자들이 매번 묻는 모든 질문에, 예! 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

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