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

Name: IronPDF
Brand: Iron Software
Availability: InStock
Rating: 4.87 (307 reviews)

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.

Free NuGet Download

Total downloads 20,809,720 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 すべてのコード例を見る

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 バージョン:

C#、VB.NET、F#言語
.NET Core (10, 9, 8, 7, 6, 5, および 3.1+)
.NET Standard (2.0+)
.NETフレームワーク (4.6.2+)

OS & プロセッサ:

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

.NET プロジェクトタイプ:

Web (Blazor & WebForms)
デスクトップ (WPF & MAUI)
コンソール (アプリ & ライブラリ)

アプリ環境:

Windows (10+, Server UI 2012+, Server Core 2022)
Linux (Ubuntu、Debian、CentOS など)
Mac (macOS 10+)
Docker (Windows, Linux, Azure)
Azure (VPS, WebApp, ファンクション)
AWS (EC2, Lambda)

IDE について:

Microsoft Visual Studio
JetBrains Rider & ReSharper

バイナリー認証

DigiCert署名済みバイナリ

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.

あなたの無料30日間の試用キーをすぐに入手。

Everything you need for PDF editing in C#

PDFを作成

完璧なPDFをデザイン

完全なPDFカスタマイズ

標準準拠

PDFバージョン (1.2 - 1.7)
PDF/UA (PDF/UA-1)
PDF/A (1-3 b/a)

PDF表示と印刷

PDFを変換

多用途なPDF変換

動的ウェブページをPDFへ

ウェブアクセシビリティ

カスタマイズされたPDF変換

PDFレイアウトを改善

PDFを編集

PDFオブジェクトを編集

ドキュメントテキストを編集

PDFデザインを強化

PDFを整理する

PDF構造を編集

補足組織

PDFに署名して安全性を確保する

真正性を保証

PDFフォーム管理

ドキュメントの安全性

その他

ウェブアセットをサポート

パフォーマンスと圧縮

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

IronPDF についてお客様は何と言っていますか？

40%節約

過去にはOCR用のプラグインやPDF用のパッケージを別々に使わなければならなかったところ、一つの低コストパッケージに統合されていることは本当に素晴らしかったです。

David Jonesリードソフトウェアエンジニアケーススタディを読む

Green2View savings chart 節約20%

Green2view は20%の費用削減、30%の迅速な書類処理、100%のコンプライアンスを達成しました。

ケーススタディを読む

WILLAN savings chart 管理作業の軽減40%

それはただ機能します—自動PDF生成は毎回ピクセルパーフェクトな財務報告書を提供します。

ケーススタディを読む

世界中の数百万人のエンジニアに信頼されています。

開発者が尋ねるたびに、YES! Iron Softwareから 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

世界クラスのエンジニアリング、
24時間サポート

専門家に相談

20M+のNuGetインストール、ますます加速中

20M+2026

2025年に1200万回のダウンロードを超えるNuGetダウンロード履歴チャート

準備はできましたか？

Nuget Downloads 20,809,720|バージョン:2026.9リリースされたばかり

NuGet 無料ダウンロード

総ダウンロード数: 20,809,720

ライセンスを見る

30日間無料トライアルを開始