编辑 PDF
利用我们无数的功能来构建现有的 PDF 文件，将它们最终处理成完美的输出文件。
精确编辑 PDF 对象
1
移动 PDF 对象
精确移动和定位 PDF 对象（如图片、文本和形状），确保元素在文档中正确对齐和放置。
了解如何：访问 PDF DOM 对象using IronPdf;
using System.Drawing;
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("Test");
// Access DOM Objects
var objects = pdf.Pages.First().ObjectModel.TextObjects.First();
// Translate by 100 points right and 100 points down
objects.Translate = new System.Drawing.PointF(100,100);Imports IronPdf
Imports System.Drawing
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("Test")
' Access DOM Objects
Dim objects = pdf.Pages.First().ObjectModel.TextObjects.First()
' Translate by 100 points right and 100 points down
objects.Translate = New System.Drawing.PointF(100, 100)2
缩放 PDF 对象
调整 PDF 对象的大小以满足您的设计要求。缩放图片、文本或其他元素以实现所需的外观而不丢失质量。
了解如何：缩放 PDF DOM 对象using IronSoftware;
using System.Drawing; // Required for PointF
// Create a PDF from a URL using a PNG image
string html = @"<img src='https://example.com/logo.png'>";
ChromePdfRenderer renderer = new ChromePdfRenderer();
// Render HTML to PDF
PdfDocument pdf = renderer.RenderHtmlAsPdf(html);
// Access the first image object on the first page
ImageObject image = pdf.Pages.First().ObjectModel.ImageObjects.FirstOrDefault();
// To scale the image to 150% of its original size uniformly
image.Scale = new System.Drawing.PointF(1.5f, 1.5f);
// Save the PDF with the scaled image
pdf.SaveAs("scaled_image.pdf");Imports IronSoftware
Imports System.Drawing ' Required for PointF
' Create a PDF from a URL using a PNG image
Dim html As String = "<img src='https://example.com/logo.png'>"
Dim renderer As New ChromePdfRenderer()
' Render HTML to PDF
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf(html)
' Access the first image object on the first page
Dim image As ImageObject = pdf.Pages.First().ObjectModel.ImageObjects.FirstOrDefault()
' To scale the image to 150% of its original size uniformly
image.Scale = New System.Drawing.PointF(1.5F, 1.5F)
' Save the PDF with the scaled image
pdf.SaveAs("scaled_image.pdf")3
删除 PDF 对象
从文档中删除不必要或不需要的 PDF 对象，以清理和简化您的内容。
了解如何：删除 PDF DOM 对象using IronSoftware;
using IronSoftware.Pdfium.Dom;
using System.Linq;
// Load a PDF file
PdfDocument pdf = PdfDocument.FromFile("sampleObjectsWithImages.pdf");
// Access DOM Objects
IPdfPageObjectModel objects = pdf.Pages.First().ObjectModel;
// Remove first image
objects.ImageObjects.RemoveAt(0);Imports IronSoftware
Imports IronSoftware.Pdfium.Dom
Imports System.Linq
' Load a PDF file
Dim pdf As PdfDocument = PdfDocument.FromFile("sampleObjectsWithImages.pdf")
' Access DOM Objects
Dim objects As IPdfPageObjectModel = pdf.Pages.First().ObjectModel
' Remove first image
objects.ImageObjects.RemoveAt(0)一次修改多个文本片段
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提取 PDF 文本和图像
从您的 PDF 文件中提取文本和图片，使内容易于重复使用或重新利用于其他文档或应用程序。
了解如何：提取文本和图像using IronPdf;
using System.IO;
PdfDocument pdf = PdfDocument.FromFile("sample.pdf");
// Extract text
string text = pdf.ExtractAllText();
// Export the extracted text to a text file
File.WriteAllText("extractedText.txt", text);Imports IronPdf
Imports System.IO
Dim pdf As PdfDocument = PdfDocument.FromFile("sample.pdf")
' Extract text
Dim text As String = pdf.ExtractAllText()
' Export the extracted text to a text file
File.WriteAllText("extractedText.txt", text)2
编辑文本
通过在您的 PDF 中编辑文本来保护敏感信息。永久性移除或遮盖文字以维护文档的机密性。
学习如何：编辑文本using IronPdf;
PdfDocument pdf = PdfDocument.FromFile("novel.pdf");
// Redact 'Alaric' phrase from all pages
pdf.RedactTextOnAllPages("Alaric");
pdf.SaveAs("redacted.pdf");Imports IronPdf
Dim pdf As PdfDocument = PdfDocument.FromFile("novel.pdf")
' Redact 'Alaric' phrase from all pages
pdf.RedactTextOnAllPages("Alaric")
pdf.SaveAs("redacted.pdf")3
查找和替换文本
快速在您的整个 PDF 文档中查找和替换文本，使内容更新和改正高效且准确无误。
了解如何：查找并替换文本using IronPdf;
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>.NET6</h1>");
string oldText = ".NET6";
string newText = ".NET7";
// Replace text on all pages
pdf.ReplaceTextOnAllPages(oldText, newText);
pdf.SaveAs("replaceText.pdf");Imports IronPdf
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>.NET6</h1>")
Dim oldText As String = ".NET6"
Dim newText As String = ".NET7"
' Replace text on all pages
pdf.ReplaceTextOnAllPages(oldText, newText)
pdf.SaveAs("replaceText.pdf")支持强大的 PDF 设计增强功能
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注释
将注释添加到您的 PDF 文件中，例如评论、突出显示或笔记，以提供额外的内容或强调特定部分。
了解如何：控制 PDF 注释using IronPdf;
using IronPdf.Annotations;
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Annotation</h1>");
// Create a PDF annotation object on a specified page index
TextAnnotation annotation = new TextAnnotation(0)
{
Title = "This is the title",
Contents = "This is the long 'sticky note' comment content...",
X = 50,
Y = 700,
};
// Add the annotation
pdf.Annotations.Add(annotation);
pdf.SaveAs("annotation.pdf");Imports IronPdf
Imports IronPdf.Annotations
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Annotation</h1>")
' Create a PDF annotation object on a specified page index
Dim annotation As New TextAnnotation(0) With {
.Title = "This is the title",
.Contents = "This is the long 'sticky note' comment content...",
.X = 50,
.Y = 700
}
' Add the annotation
pdf.Annotations.Add(annotation)
pdf.SaveAs("annotation.pdf")2
标记文本和图片
将自定义文本或图片标记应用到您的 PDF 中以用于品牌化、审批或特殊标记，增强文档的专业性和清晰度。
了解如何：添加文本和图像图章using IronPdf;
using IronPdf.Editing;
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>");
// Create text stamper
TextStamper textStamper = new TextStamper()
{
Text = "Text Stamper!",
FontFamily = "Bungee Spice",
UseGoogleFont = true,
FontSize = 30,
IsBold = true,
IsItalic = true,
VerticalAlignment = VerticalAlignment.Top,
};
// Stamp the text stamper
pdf.ApplyStamp(textStamper);
pdf.SaveAs("stampText.pdf");Imports IronPdf
Imports IronPdf.Editing
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>")
' Create text stamper
Dim textStamper As New TextStamper() With {
.Text = "Text Stamper!",
.FontFamily = "Bungee Spice",
.UseGoogleFont = True,
.FontSize = 30,
.IsBold = True,
.IsItalic = True,
.VerticalAlignment = VerticalAlignment.Top
}
' Stamp the text stamper
pdf.ApplyStamp(textStamper)
pdf.SaveAs("stampText.pdf")3
自定义水印
在您的 PDF 文档上创建并应用自定义水印以标记草稿、保密或添加品牌元素。
学习如何创建水印using IronPdf;
string watermarkHtml = @"
<img src='https://ironsoftware.com/img/products/ironpdf-logo-text-dotnet.svg'>
";
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Watermark</h1>");
// Apply watermark
pdf.ApplyWatermark(watermarkHtml);
pdf.SaveAs("watermark.pdf");Imports IronPdf
Dim watermarkHtml As String = "
<img src='https://ironsoftware.com/img/products/ironpdf-logo-text-dotnet.svg'>
"
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Watermark</h1>")
' Apply watermark
pdf.ApplyWatermark(watermarkHtml)
pdf.SaveAs("watermark.pdf")4
绘制文本和位图
将自定义文本和位图图片添加到您的 PDF 中，让您自由地包含根据文档需求定制的独特内容元素。
了解如何：绘制文本和位图using IronPdf;
using IronSoftware.Drawing;
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>testing</h1>");
// Draw text on PDF
pdf.DrawText("Some text", FontTypes.TimesNewRoman.Name, FontSize: 12, PageIndex: 0, X: 100, Y: 100, Color.Black, Rotation: 0);
// Open the image from file
AnyBitmap bitmap = AnyBitmap.FromFile("ironSoftware.png");
// Draw the bitmp on PDF
pdf.DrawBitmap(bitmap, 0, 50, 250, 500, 300);Imports IronPdf
Imports IronSoftware.Drawing
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>testing</h1>")
' Draw text on PDF
pdf.DrawText("Some text", FontTypes.TimesNewRoman.Name, 12, 0, 100, 100, Color.Black, 0)
' Open the image from file
Dim bitmap As AnyBitmap = AnyBitmap.FromFile("ironSoftware.png")
' Draw the bitmap on PDF
pdf.DrawBitmap(bitmap, 0, 50, 250, 500, 300)5
绘制线条和矩形
在您的 PDF 中插入线条和矩形以结构化内容、强调部分或创建图表。
学习如何：转换矩形using IronPdf;
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>testing</h1>");
// Configure the required parameters
int pageIndex = 0;
var start = new IronSoftware.Drawing.PointF(200,150);
var end = new IronSoftware.Drawing.PointF(1000,150);
int width = 10;
var color = new IronSoftware.Drawing.Color("#000000");
// Draw line on PDF
pdf.DrawLine(pageIndex, start, end, width, color);
pdf.SaveAs("drawLine.pdf");Imports IronPdf
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>testing</h1>")
' Configure the required parameters
Dim pageIndex As Integer = 0
Dim start = New IronSoftware.Drawing.PointF(200, 150)
Dim [end] = New IronSoftware.Drawing.PointF(1000, 150)
Dim width As Integer = 10
Dim color = New IronSoftware.Drawing.Color("#000000")
' Draw line on PDF
pdf.DrawLine(pageIndex, start, [end], width, color)
pdf.SaveAs("drawLine.pdf")6
添加页眉/页脚
将自定义的页眉和页脚与文本、图片或 HTML 元素结合到您的 PDF 中，创造一个一致而专业的外观。
了解如何：添加页眉/页脚using IronPdf;
// Instantiate renderer and create PDF
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Hello World!</h1>");
// Create text header
TextHeaderFooter textHeader = new TextHeaderFooter
{
CenterText = "This is the header!",
};
// Add text header to the PDF
pdf.AddTextHeaders(textHeader);
pdf.SaveAs("addTextHeaderFooter.pdf");Imports IronPdf
' Instantiate renderer and create PDF
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Hello World!</h1>")
' Create text header
Dim textHeader As New TextHeaderFooter With {
.CenterText = "This is the header!"
}
' Add text header to the PDF
pdf.AddTextHeaders(textHeader)
pdf.SaveAs("addTextHeaderFooter.pdf")7
增加页码
将页码插入您的 PDF，根据您的格式首选项定位它们，以保持文档结构的有序性。
了解如何：添加页码using IronPdf;
// Create text header
TextHeaderFooter textHeader = new TextHeaderFooter()
{
CenterText = "{page} of {total-pages}"
};
// Render a new PDF
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Hello World!</h1>");
// Add header and footer
pdf.AddTextHeaders(textHeader);
pdf.SaveAs("pdfWithPageNumber.pdf");Imports IronPdf
' Create text header
Dim textHeader As New TextHeaderFooter() With {
.CenterText = "{page} of {total-pages}"
}
' Render a new PDF
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Hello World!</h1>")
' Add header and footer
pdf.AddTextHeaders(textHeader)
pdf.SaveAs("pdfWithPageNumber.pdf")8
背景和前景
控制 PDF 中的背景和前景元素，以突出特定内容，提高可读性或增加视觉吸引力。
了解如何：添加背景和前景using IronPdf;
ChromePdfRenderer renderer = new ChromePdfRenderer();
PdfDocument pdf = renderer.RenderHtmlAsPdf("<h1>Main HTML content</h1>");
// Render background
PdfDocument background = renderer.RenderHtmlAsPdf("<body style='background-color: cyan;'></body>");
// Render foreground
PdfDocument foreground = renderer.RenderHtmlAsPdf("<h1 style='transform: rotate(-45deg); opacity: 50%;'>Overlay Watermark</h1>");
// Add background
pdf.AddBackgroundPdf(background);
// Overlay foreground
pdf.AddForegroundOverlayPdf(foreground);Imports IronPdf
Dim renderer As New ChromePdfRenderer()
Dim pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Main HTML content</h1>")
' Render background
Dim background As PdfDocument = renderer.RenderHtmlAsPdf("<body style='background-color: cyan;'></body>")
' Render foreground
Dim foreground As PdfDocument = renderer.RenderHtmlAsPdf("<h1 style='transform: rotate(-45deg); opacity: 50%;'>Overlay Watermark</h1>")
' Add background
pdf.AddBackgroundPdf(background)
' Overlay foreground
pdf.AddForegroundOverlayPdf(foreground)准备开始了吗？
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