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一个体面且简单的PDF操作工具可以简化创建和编辑PDF文档所涉及的许多任务和过程。 在 .NET 生态系统中,有两个流行的库– IronPDF 和 iText– 它们允许生成 PDF 而无需任何 Adobe 依赖。 他们都具有多种功能,如创建、编辑、转换等,但本文将侧重于根据三个标准比较这些库:他们所提供的功能的能力、他们提供的文档质量、这些公司采用的产品使用定价政策。
IronPDF是一个杰出的.NET PDF库,它使程序员能够轻松创建、修改和与PDF文档进行交互。 它可以用于不同的 .NET 环境,包括 Core、8、7、6 和 Framework,这使得它非常灵活,适用于各种开发需求。 IronPDF的关键功能是其丰富的功能集,例如HTML到PDF转换、合并PDF、PDF加密以及应用数字签名等。 该文档的编写方式使用户可以轻松理解,同时库本身具有强大的技术支持。
iText 是最流行的 PDF 库之一,适用于 Java 和 .NET (C#)。 iText Core 8 提供了一个企业级可编程解决方案,用于创建和操作 PDF 文件。 iText 提供多种不同功能的支持,并以开源(AGPL)许可证和商业许可证发布。 这意味着由于其多功能性,它能够在数字化转型项目中覆盖广泛的用例。
IronPDF和iText兼容各种平台; 他们可以在多种不同的系统以及在.NET框架内处理PDF文件。 因此,我们将在下面比较每个产品支持的框架和平台。
IronPDF 支持平台概览 支持广泛的平台和环境,确保在各种系统中的无缝集成和部署:
.NET 版本:
(C#, VB.NET, F#)
.NET Core(8、7、6、5 和 3.1+)
.NET 版本:
.NET Core(2.x,3.x)
IronPDF 关键功能列表和 iText 都提供了一系列可用于处理 PDF 文件的功能和工具; 接下来的部分将重点介绍这些功能的一些内容,并比较两个库在执行不同的PDF相关任务时的表现。
PDF 盖章:使用 IronPDF 在您的 PDF 文档上盖上图像和文本。
有关 IronPDF 所提供的广泛功能集的更多信息,请访问 IronPDF 功能页面。
使用 IronPDF 将HTML 内容转换为 PDF是许多办公室和工作场所中进行的一项非常简单的任务。 以下是比较IronPDF和iText如何处理此过程的代码示例。
IronPDF
using IronPdf;
// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;
// Instantiate Renderer
var renderer = new ChromePdfRenderer();
// Create a PDF from an HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");
pdf.SaveAs("output.pdf");
// Advanced Example with HTML Assets
// Load external html assets: images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");
using IronPdf;
// Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = true;
// Instantiate Renderer
var renderer = new ChromePdfRenderer();
// Create a PDF from an HTML string using C#
var pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>");
pdf.SaveAs("output.pdf");
// Advanced Example with HTML Assets
// Load external html assets: images, CSS and JavaScript.
// An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
var myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", @"C:\site\assets\");
myAdvancedPdf.SaveAs("html-with-assets.pdf");
Imports IronPdf
' Disable local disk access or cross-origin requests
Installation.EnableWebSecurity = True
' Instantiate Renderer
Dim renderer = New ChromePdfRenderer()
' Create a PDF from an HTML string using C#
Dim pdf = renderer.RenderHtmlAsPdf("<h1>Hello World</h1>")
pdf.SaveAs("output.pdf")
' Advanced Example with HTML Assets
' Load external html assets: images, CSS and JavaScript.
' An optional BasePath 'C:\site\assets\' is set as the file location to load assets from
Dim myAdvancedPdf = renderer.RenderHtmlAsPdf("<img src='icons/iron.png'>", "C:\site\assets\")
myAdvancedPdf.SaveAs("html-with-assets.pdf")
iText
using iText.Html2pdf;
static void Main(string[] args)
{
using (FileStream htmlSource = File.Open("input.html", FileMode.Open))
using (FileStream pdfDest = File.Open("output.pdf", FileMode.Create))
{
ConverterProperties converterProperties = new ConverterProperties();
HtmlConverter.ConvertToPdf(htmlSource, pdfDest, converterProperties);
}
}
using iText.Html2pdf;
static void Main(string[] args)
{
using (FileStream htmlSource = File.Open("input.html", FileMode.Open))
using (FileStream pdfDest = File.Open("output.pdf", FileMode.Create))
{
ConverterProperties converterProperties = new ConverterProperties();
HtmlConverter.ConvertToPdf(htmlSource, pdfDest, converterProperties);
}
}
Imports iText.Html2pdf
Shared Sub Main(ByVal args() As String)
Using htmlSource As FileStream = File.Open("input.html", FileMode.Open)
Using pdfDest As FileStream = File.Open("output.pdf", FileMode.Create)
Dim converterProperties As New ConverterProperties()
HtmlConverter.ConvertToPdf(htmlSource, pdfDest, converterProperties)
End Using
End Using
End Sub
当将HTML转换为PDF时,IronPDF提供了一个简洁且方便的工具来执行此任务。 使用 ChromePdfRenderer 将 HTML 内容转换为 PDF,IronPDF 在提供像素完美的 PDF 文档方面表现卓越。 用户可以直接从HTML字符串创建PDF,如第一个示例所示,或者包含外部资源,如图像,并附带一个可选的基本路径,如高级示例中所演示的。 iText,采用基本的方法,使用其HtmlConverter类从HTML文件创建PDF文档。
使用IronPDF加密PDF文件以及PDF文档的解密在许多工作场所非常重要。 要轻松处理这项任务,就必须有一个便捷的工具。 在下面的代码中,我们将看到iText和IronPDF如何处理PDF的加密。
IronPDF
using IronPdf;
using System;
// Open an Encrypted File, alternatively create a new PDF from Html
var pdf = PdfDocument.FromFile("encrypted.pdf", "password");
// Edit file metadata
pdf.MetaData.Author = "Satoshi Nakamoto";
pdf.MetaData.Keywords = "SEO, Friendly";
pdf.MetaData.ModifiedDate = DateTime.Now;
// Edit file security settings
// The following code makes a PDF read only and will disallow copy & paste and printing
pdf.SecuritySettings.RemovePasswordsAndEncryption();
pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key");
pdf.SecuritySettings.AllowUserAnnotations = false;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;
pdf.SecuritySettings.AllowUserFormData = false;
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
// change or set the document encryption password
pdf.Password = "my-password";
pdf.SaveAs("secured.pdf");
using IronPdf;
using System;
// Open an Encrypted File, alternatively create a new PDF from Html
var pdf = PdfDocument.FromFile("encrypted.pdf", "password");
// Edit file metadata
pdf.MetaData.Author = "Satoshi Nakamoto";
pdf.MetaData.Keywords = "SEO, Friendly";
pdf.MetaData.ModifiedDate = DateTime.Now;
// Edit file security settings
// The following code makes a PDF read only and will disallow copy & paste and printing
pdf.SecuritySettings.RemovePasswordsAndEncryption();
pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key");
pdf.SecuritySettings.AllowUserAnnotations = false;
pdf.SecuritySettings.AllowUserCopyPasteContent = false;
pdf.SecuritySettings.AllowUserFormData = false;
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights;
// change or set the document encryption password
pdf.Password = "my-password";
pdf.SaveAs("secured.pdf");
Imports IronPdf
Imports System
' Open an Encrypted File, alternatively create a new PDF from Html
Private pdf = PdfDocument.FromFile("encrypted.pdf", "password")
' Edit file metadata
pdf.MetaData.Author = "Satoshi Nakamoto"
pdf.MetaData.Keywords = "SEO, Friendly"
pdf.MetaData.ModifiedDate = DateTime.Now
' Edit file security settings
' The following code makes a PDF read only and will disallow copy & paste and printing
pdf.SecuritySettings.RemovePasswordsAndEncryption()
pdf.SecuritySettings.MakePdfDocumentReadOnly("secret-key")
pdf.SecuritySettings.AllowUserAnnotations = False
pdf.SecuritySettings.AllowUserCopyPasteContent = False
pdf.SecuritySettings.AllowUserFormData = False
pdf.SecuritySettings.AllowUserPrinting = IronPdf.Security.PdfPrintSecurity.FullPrintRights
' change or set the document encryption password
pdf.Password = "my-password"
pdf.SaveAs("secured.pdf")
iText
using System;
using System.IO;
using System.Text;
using iText.Kernel.Pdf;
public class EncryptPdf
{
public static readonly String DEST = "results/sandbox/security/encrypt_pdf.pdf";
public static readonly String SRC = "../../../resources/pdfs/hello.pdf";
public static readonly String OWNER_PASSWORD = "World";
public static readonly String USER_PASSWORD = "Hello";
public static void Main(String[] args)
{
FileInfo file = new FileInfo(DEST);
file.Directory.Create();
new EncryptPdf().ManipulatePdf(DEST);
}
protected void ManipulatePdf(String dest)
{
PdfDocument document = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest,
new WriterProperties().SetStandardEncryption(
Encoding.UTF8.GetBytes(USER_PASSWORD),
Encoding.UTF8.GetBytes(OWNER_PASSWORD),
EncryptionConstants.ALLOW_PRINTING,
EncryptionConstants.ENCRYPTION_AES_128
EncryptionConstants.DO_NOT_ENCRYPT_METADATA
)));
document.Close();
}
}
using System;
using System.IO;
using System.Text;
using iText.Kernel.Pdf;
public class EncryptPdf
{
public static readonly String DEST = "results/sandbox/security/encrypt_pdf.pdf";
public static readonly String SRC = "../../../resources/pdfs/hello.pdf";
public static readonly String OWNER_PASSWORD = "World";
public static readonly String USER_PASSWORD = "Hello";
public static void Main(String[] args)
{
FileInfo file = new FileInfo(DEST);
file.Directory.Create();
new EncryptPdf().ManipulatePdf(DEST);
}
protected void ManipulatePdf(String dest)
{
PdfDocument document = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest,
new WriterProperties().SetStandardEncryption(
Encoding.UTF8.GetBytes(USER_PASSWORD),
Encoding.UTF8.GetBytes(OWNER_PASSWORD),
EncryptionConstants.ALLOW_PRINTING,
EncryptionConstants.ENCRYPTION_AES_128
EncryptionConstants.DO_NOT_ENCRYPT_METADATA
)));
document.Close();
}
}
IRON VB CONVERTER ERROR developers@ironsoftware.com
IronPDF 为用户提供了一种简单的方法来加密 PDF 文件,同时也为用户在过程中提供了大量的控制,包括编辑元数据和调整安全设置,如将文档设为只读或限制用户操作(如复制和粘贴)。 另一方面,iText 采用较低层次且较长的方法,在文档创建过程中应用PDF加密,指定拥有者和用户密码以及利用AES-128等加密标准的打印权限。
偶尔,在处理机密或私人信息时,可能需要在PDF文件中使用IronPDF编辑文本。下面的代码示例将演示如何使用IronPDF与iText进行文本编辑。
IronPDF
using IronPdf;
PdfDocument pdf = PdfDocument.FromFile("novel.pdf");
// Redact 'are' phrase from all pages
pdf.RedactTextOnAllPages("are");
pdf.SaveAs("redacted.pdf");
using IronPdf;
PdfDocument pdf = PdfDocument.FromFile("novel.pdf");
// Redact 'are' phrase from all pages
pdf.RedactTextOnAllPages("are");
pdf.SaveAs("redacted.pdf");
Imports IronPdf
Private pdf As PdfDocument = PdfDocument.FromFile("novel.pdf")
' Redact 'are' phrase from all pages
pdf.RedactTextOnAllPages("are")
pdf.SaveAs("redacted.pdf")
iText
using System;
using System.IO;
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Properties;
using iText.Kernel.Colors;
string src = "input.pdf";
string dest = "output_redacted.pdf";
using (PdfReader reader = new PdfReader(src))
{
using (PdfWriter writer = new PdfWriter(dest))
{
using (PdfDocument pdfDoc = new PdfDocument(reader, writer))
{
// Iterate through each page
for (int pageNum = 1; pageNum <= pdfDoc.GetNumberOfPages(); pageNum++)
{
PdfPage page = pdfDoc.GetPage(pageNum);
PdfCanvas canvas = new PdfCanvas(page);
Rectangle[] rectanglesToRedact = { new Rectangle(100, 100, 200, 50) }; // Example: Define rectangles to redact
// Overlay black rectangles to simulate redaction
foreach (Rectangle rect in rectanglesToRedact)
{
canvas.SetFillColor(ColorConstants.BLACK)
.Rectangle(rect.GetX(), rect.GetY(), rect.GetWidth(), rect.GetHeight())
.Fill();
}
}
}
}
using System;
using System.IO;
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Properties;
using iText.Kernel.Colors;
string src = "input.pdf";
string dest = "output_redacted.pdf";
using (PdfReader reader = new PdfReader(src))
{
using (PdfWriter writer = new PdfWriter(dest))
{
using (PdfDocument pdfDoc = new PdfDocument(reader, writer))
{
// Iterate through each page
for (int pageNum = 1; pageNum <= pdfDoc.GetNumberOfPages(); pageNum++)
{
PdfPage page = pdfDoc.GetPage(pageNum);
PdfCanvas canvas = new PdfCanvas(page);
Rectangle[] rectanglesToRedact = { new Rectangle(100, 100, 200, 50) }; // Example: Define rectangles to redact
// Overlay black rectangles to simulate redaction
foreach (Rectangle rect in rectanglesToRedact)
{
canvas.SetFillColor(ColorConstants.BLACK)
.Rectangle(rect.GetX(), rect.GetY(), rect.GetWidth(), rect.GetHeight())
.Fill();
}
}
}
}
Imports System
Imports System.IO
Imports iText.Kernel.Pdf
Imports iText.Layout
Imports iText.Layout.Element
Imports iText.Layout.Properties
Imports iText.Kernel.Colors
Private src As String = "input.pdf"
Private dest As String = "output_redacted.pdf"
Using reader As New PdfReader(src)
Using writer As New PdfWriter(dest)
Using pdfDoc As New PdfDocument(reader, writer)
' Iterate through each page
Dim pageNum As Integer = 1
Do While pageNum <= pdfDoc.GetNumberOfPages()
Dim page As PdfPage = pdfDoc.GetPage(pageNum)
Dim canvas As New PdfCanvas(page)
Dim rectanglesToRedact() As Rectangle = { New Rectangle(100, 100, 200, 50) } ' Example: Define rectangles to redact
' Overlay black rectangles to simulate redaction
For Each rect As Rectangle In rectanglesToRedact
canvas.SetFillColor(ColorConstants.BLACK).Rectangle(rect.GetX(), rect.GetY(), rect.GetWidth(), rect.GetHeight()).Fill()
Next rect
pageNum += 1
Loop
End Using
End Using
IronPDF的编辑工具简洁且易于使用,只需几行代码即可精简编辑过程。 这有助于提高PDF编辑任务的效率,并为用户提供一种简单的方式来保护他们的敏感和私人数据安全。
iText,另一方面,未像IronPDF那样提供内置的编辑工具。 但是,它仍然可以使用上面显示的方法来覆盖用户希望编辑的内容中的敏感数据。 这可能会导致问题,因为这些矩形并没有实际删除或正确涂改文本,这意味着其他人可能还能复制和粘贴试图被涂改的数据。
能够使用IronPDF对PDF文档进行数字签名,例如PDF文件,然后使其成为自动化过程可以节省时间。 以下是一些代码片段,将比较IronPDF与iText在执行文档数字签名方面的不同。
IronPDF
using IronPdf;
using IronPdf.Signing;
using System.Security.Cryptography.X509Certificates;
// Create X509Certificate2 object with X509KeyStorageFlags set to Exportable
X509Certificate2 cert = new X509Certificate2("IronSoftware.pfx", "123456", X509KeyStorageFlags.Exportable);
// Create PdfSignature object
var sig = new PdfSignature(cert);
// Sign PDF document
PdfDocument pdf = PdfDocument.FromFile("document.pdf");
pdf.Sign(sig);
pdf.SaveAs("signed.pdf");
using IronPdf;
using IronPdf.Signing;
using System.Security.Cryptography.X509Certificates;
// Create X509Certificate2 object with X509KeyStorageFlags set to Exportable
X509Certificate2 cert = new X509Certificate2("IronSoftware.pfx", "123456", X509KeyStorageFlags.Exportable);
// Create PdfSignature object
var sig = new PdfSignature(cert);
// Sign PDF document
PdfDocument pdf = PdfDocument.FromFile("document.pdf");
pdf.Sign(sig);
pdf.SaveAs("signed.pdf");
Imports IronPdf
Imports IronPdf.Signing
Imports System.Security.Cryptography.X509Certificates
' Create X509Certificate2 object with X509KeyStorageFlags set to Exportable
Private cert As New X509Certificate2("IronSoftware.pfx", "123456", X509KeyStorageFlags.Exportable)
' Create PdfSignature object
Private sig = New PdfSignature(cert)
' Sign PDF document
Private pdf As PdfDocument = PdfDocument.FromFile("document.pdf")
pdf.Sign(sig)
pdf.SaveAs("signed.pdf")
iText
using System;
using System.IO;
using iText.Kernel.Pdf;
using iText.Signatures;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.X509;
class Program
{
static void Main(string[] args)
{
string src = "input.pdf";
string dest = "output_signed.pdf";
string pfxFile = "your_certificate.pfx";
string pfxPassword = "your_password";
try
{
// Load your certificate
Pkcs12Store ks = new Pkcs12Store(new FileStream(pfxFile, FileMode.Open), pfxPassword.ToCharArray());
string alias = null;
foreach (string al in ks.Aliases)
{
if (ks.IsKeyEntry(al))
{
alias = al;
break;
}
}
ICipherParameters pk = ks.GetKey(alias).Key;
X509CertificateEntry[] chain = ks.GetCertificateChain(alias);
X509Certificate2 cert = new X509Certificate2(chain[0].Certificate.GetEncoded());
// Create output PDF with signed content
using (PdfReader reader = new PdfReader(src))
{
using (PdfWriter writer = new PdfWriter(dest))
{
using (PdfDocument pdfDoc = new PdfDocument(reader, writer))
{
// Create the signer
PdfSigner signer = new PdfSigner(pdfDoc, writer, new StampingProperties().UseAppendMode());
// Configure signature appearance
PdfSignatureAppearance appearance = signer.GetSignatureAppearance();
appearance.SetReason("Digital Signature");
appearance.SetLocation("Your Location");
appearance.SetContact("Your Contact");
// Create signature
IExternalSignature pks = new PrivateKeySignature(pk, "SHA-256");
signer.SignDetached(pks, chain, null, null, null, 0, PdfSigner.CryptoStandard.CMS);
}
}
}
Console.WriteLine($"PDF digitally signed successfully: {dest}");
}
catch (Exception ex)
{
Console.WriteLine($"Error signing PDF: {ex.Message}");
}
}
}
using System;
using System.IO;
using iText.Kernel.Pdf;
using iText.Signatures;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.X509;
class Program
{
static void Main(string[] args)
{
string src = "input.pdf";
string dest = "output_signed.pdf";
string pfxFile = "your_certificate.pfx";
string pfxPassword = "your_password";
try
{
// Load your certificate
Pkcs12Store ks = new Pkcs12Store(new FileStream(pfxFile, FileMode.Open), pfxPassword.ToCharArray());
string alias = null;
foreach (string al in ks.Aliases)
{
if (ks.IsKeyEntry(al))
{
alias = al;
break;
}
}
ICipherParameters pk = ks.GetKey(alias).Key;
X509CertificateEntry[] chain = ks.GetCertificateChain(alias);
X509Certificate2 cert = new X509Certificate2(chain[0].Certificate.GetEncoded());
// Create output PDF with signed content
using (PdfReader reader = new PdfReader(src))
{
using (PdfWriter writer = new PdfWriter(dest))
{
using (PdfDocument pdfDoc = new PdfDocument(reader, writer))
{
// Create the signer
PdfSigner signer = new PdfSigner(pdfDoc, writer, new StampingProperties().UseAppendMode());
// Configure signature appearance
PdfSignatureAppearance appearance = signer.GetSignatureAppearance();
appearance.SetReason("Digital Signature");
appearance.SetLocation("Your Location");
appearance.SetContact("Your Contact");
// Create signature
IExternalSignature pks = new PrivateKeySignature(pk, "SHA-256");
signer.SignDetached(pks, chain, null, null, null, 0, PdfSigner.CryptoStandard.CMS);
}
}
}
Console.WriteLine($"PDF digitally signed successfully: {dest}");
}
catch (Exception ex)
{
Console.WriteLine($"Error signing PDF: {ex.Message}");
}
}
}
Imports System
Imports System.IO
Imports iText.Kernel.Pdf
Imports iText.Signatures
Imports Org.BouncyCastle.Crypto
Imports Org.BouncyCastle.Pkcs
Imports Org.BouncyCastle.X509
Friend Class Program
Shared Sub Main(ByVal args() As String)
Dim src As String = "input.pdf"
Dim dest As String = "output_signed.pdf"
Dim pfxFile As String = "your_certificate.pfx"
Dim pfxPassword As String = "your_password"
Try
' Load your certificate
Dim ks As New Pkcs12Store(New FileStream(pfxFile, FileMode.Open), pfxPassword.ToCharArray())
Dim [alias] As String = Nothing
For Each al As String In ks.Aliases
If ks.IsKeyEntry(al) Then
[alias] = al
Exit For
End If
Next al
Dim pk As ICipherParameters = ks.GetKey([alias]).Key
Dim chain() As X509CertificateEntry = ks.GetCertificateChain([alias])
Dim cert As New X509Certificate2(chain(0).Certificate.GetEncoded())
' Create output PDF with signed content
Using reader As New PdfReader(src)
Using writer As New PdfWriter(dest)
Using pdfDoc As New PdfDocument(reader, writer)
' Create the signer
Dim signer As New PdfSigner(pdfDoc, writer, (New StampingProperties()).UseAppendMode())
' Configure signature appearance
Dim appearance As PdfSignatureAppearance = signer.GetSignatureAppearance()
appearance.SetReason("Digital Signature")
appearance.SetLocation("Your Location")
appearance.SetContact("Your Contact")
' Create signature
Dim pks As IExternalSignature = New PrivateKeySignature(pk, "SHA-256")
signer.SignDetached(pks, chain, Nothing, Nothing, Nothing, 0, PdfSigner.CryptoStandard.CMS)
End Using
End Using
End Using
Console.WriteLine($"PDF digitally signed successfully: {dest}")
Catch ex As Exception
Console.WriteLine($"Error signing PDF: {ex.Message}")
End Try
End Sub
End Class
在以数字方式对PDF文件应用签名时,IronPDF 提供了一个简洁而强大的工具来完成此过程。 其简便性使得这一过程能够迅速进行,为实施此签名需求的开发者节省时间。 iText 需要一个更长、更复杂的过程来为PDF文件应用数字签名,虽然他们使用不同接口选项和密钥的能力为用户提供了更多的控制,但该工具执行此任务的复杂性可能会阻碍它。
通过软件使用IronPDF在PDF上添加和个性化水印的能力可以大大帮助处理保密性、版权保护、品牌推广或其他涉及敏感信息的任务。 以下是IronPDF和iText如何在PDF文件上应用水印的比较。
IronPDF
using IronPdf;
// Stamps a Watermark onto a new or existing PDF
var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");
pdf.ApplyWatermark("<h2 style='color:red'>SAMPLE</h2>", 30, IronPdf.Editing.VerticalAlignment.Middle, IronPdf.Editing.HorizontalAlignment.Center);
pdf.SaveAs(@"C:\Path\To\Watermarked.pdf");
using IronPdf;
// Stamps a Watermark onto a new or existing PDF
var renderer = new ChromePdfRenderer();
var pdf = renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf");
pdf.ApplyWatermark("<h2 style='color:red'>SAMPLE</h2>", 30, IronPdf.Editing.VerticalAlignment.Middle, IronPdf.Editing.HorizontalAlignment.Center);
pdf.SaveAs(@"C:\Path\To\Watermarked.pdf");
Imports IronPdf
' Stamps a Watermark onto a new or existing PDF
Private renderer = New ChromePdfRenderer()
Private pdf = renderer.RenderUrlAsPdf("https://www.nuget.org/packages/IronPdf")
pdf.ApplyWatermark("<h2 style='color:red'>SAMPLE</h2>", 30, IronPdf.Editing.VerticalAlignment.Middle, IronPdf.Editing.HorizontalAlignment.Center)
pdf.SaveAs("C:\Path\To\Watermarked.pdf")
iText
using iText.IO.Font;
using iText.IO.Font.Constants;
using iText.Kernel.Colors;
using iText.Kernel.Font;
using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Canvas;
using iText.Kernel.Pdf.Extgstate;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Properties;
public class TransparentWatermark
{
public static readonly String DEST = "results/sandbox/stamper/transparent_watermark.pdf";
public static readonly String SRC = "../../../resources/pdfs/hero.pdf";
public static void Main(String[] args)
{
FileInfo file = new FileInfo(DEST);
file.Directory.Create();
new TransparentWatermark().ManipulatePdf(DEST);
}
protected void ManipulatePdf(String dest)
{
PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest));
PdfCanvas under = new PdfCanvas(pdfDoc.GetFirstPage().NewContentStreamBefore(), new PdfResources(), pdfDoc);
PdfFont font = PdfFontFactory.CreateFont(FontProgramFactory.CreateFont(StandardFonts.HELVETICA));
Paragraph paragraph = new Paragraph("This watermark is added UNDER the existing content")
.SetFont(font)
.SetFontSize(15);
Canvas canvasWatermark1 = new Canvas(under, pdfDoc.GetDefaultPageSize())
.ShowTextAligned(paragraph, 297, 550, 1, TextAlignment.CENTER, VerticalAlignment.TOP, 0);
canvasWatermark1.Close();
PdfCanvas over = new PdfCanvas(pdfDoc.GetFirstPage());
over.SetFillColor(ColorConstants.BLACK);
paragraph = new Paragraph("This watermark is added ON TOP OF the existing content")
.SetFont(font)
.SetFontSize(15);
Canvas canvasWatermark2 = new Canvas(over, pdfDoc.GetDefaultPageSize())
.ShowTextAligned(paragraph, 297, 500, 1, TextAlignment.CENTER, VerticalAlignment.TOP, 0);
canvasWatermark2.Close();
paragraph = new Paragraph("This TRANSPARENT watermark is added ON TOP OF the existing content")
.SetFont(font)
.SetFontSize(15);
over.SaveState();
// Creating a dictionary that maps resource names to graphics state parameter dictionaries
PdfExtGState gs1 = new PdfExtGState();
gs1.SetFillOpacity(0.5f);
over.SetExtGState(gs1);
Canvas canvasWatermark3 = new Canvas(over, pdfDoc.GetDefaultPageSize())
.ShowTextAligned(paragraph, 297, 450, 1, TextAlignment.CENTER, VerticalAlignment.TOP, 0);
canvasWatermark3.Close();
over.RestoreState();
pdfDoc.Close();
}
}
using iText.IO.Font;
using iText.IO.Font.Constants;
using iText.Kernel.Colors;
using iText.Kernel.Font;
using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Canvas;
using iText.Kernel.Pdf.Extgstate;
using iText.Layout;
using iText.Layout.Element;
using iText.Layout.Properties;
public class TransparentWatermark
{
public static readonly String DEST = "results/sandbox/stamper/transparent_watermark.pdf";
public static readonly String SRC = "../../../resources/pdfs/hero.pdf";
public static void Main(String[] args)
{
FileInfo file = new FileInfo(DEST);
file.Directory.Create();
new TransparentWatermark().ManipulatePdf(DEST);
}
protected void ManipulatePdf(String dest)
{
PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest));
PdfCanvas under = new PdfCanvas(pdfDoc.GetFirstPage().NewContentStreamBefore(), new PdfResources(), pdfDoc);
PdfFont font = PdfFontFactory.CreateFont(FontProgramFactory.CreateFont(StandardFonts.HELVETICA));
Paragraph paragraph = new Paragraph("This watermark is added UNDER the existing content")
.SetFont(font)
.SetFontSize(15);
Canvas canvasWatermark1 = new Canvas(under, pdfDoc.GetDefaultPageSize())
.ShowTextAligned(paragraph, 297, 550, 1, TextAlignment.CENTER, VerticalAlignment.TOP, 0);
canvasWatermark1.Close();
PdfCanvas over = new PdfCanvas(pdfDoc.GetFirstPage());
over.SetFillColor(ColorConstants.BLACK);
paragraph = new Paragraph("This watermark is added ON TOP OF the existing content")
.SetFont(font)
.SetFontSize(15);
Canvas canvasWatermark2 = new Canvas(over, pdfDoc.GetDefaultPageSize())
.ShowTextAligned(paragraph, 297, 500, 1, TextAlignment.CENTER, VerticalAlignment.TOP, 0);
canvasWatermark2.Close();
paragraph = new Paragraph("This TRANSPARENT watermark is added ON TOP OF the existing content")
.SetFont(font)
.SetFontSize(15);
over.SaveState();
// Creating a dictionary that maps resource names to graphics state parameter dictionaries
PdfExtGState gs1 = new PdfExtGState();
gs1.SetFillOpacity(0.5f);
over.SetExtGState(gs1);
Canvas canvasWatermark3 = new Canvas(over, pdfDoc.GetDefaultPageSize())
.ShowTextAligned(paragraph, 297, 450, 1, TextAlignment.CENTER, VerticalAlignment.TOP, 0);
canvasWatermark3.Close();
over.RestoreState();
pdfDoc.Close();
}
}
Imports iText.IO.Font
Imports iText.IO.Font.Constants
Imports iText.Kernel.Colors
Imports iText.Kernel.Font
Imports iText.Kernel.Pdf
Imports iText.Kernel.Pdf.Canvas
Imports iText.Kernel.Pdf.Extgstate
Imports iText.Layout
Imports iText.Layout.Element
Imports iText.Layout.Properties
Public Class TransparentWatermark
Public Shared ReadOnly DEST As String = "results/sandbox/stamper/transparent_watermark.pdf"
Public Shared ReadOnly SRC As String = "../../../resources/pdfs/hero.pdf"
Public Shared Sub Main(ByVal args() As String)
Dim file As New FileInfo(DEST)
file.Directory.Create()
Call (New TransparentWatermark()).ManipulatePdf(DEST)
End Sub
Protected Sub ManipulatePdf(ByVal dest As String)
Dim pdfDoc As New PdfDocument(New PdfReader(SRC), New PdfWriter(dest))
Dim under As New PdfCanvas(pdfDoc.GetFirstPage().NewContentStreamBefore(), New PdfResources(), pdfDoc)
Dim font As PdfFont = PdfFontFactory.CreateFont(FontProgramFactory.CreateFont(StandardFonts.HELVETICA))
Dim paragraph As Paragraph = (New Paragraph("This watermark is added UNDER the existing content")).SetFont(font).SetFontSize(15)
Dim canvasWatermark1 As Canvas = (New Canvas(under, pdfDoc.GetDefaultPageSize())).ShowTextAligned(paragraph, 297, 550, 1, TextAlignment.CENTER, VerticalAlignment.TOP, 0)
canvasWatermark1.Close()
Dim over As New PdfCanvas(pdfDoc.GetFirstPage())
over.SetFillColor(ColorConstants.BLACK)
paragraph = (New Paragraph("This watermark is added ON TOP OF the existing content")).SetFont(font).SetFontSize(15)
Dim canvasWatermark2 As Canvas = (New Canvas(over, pdfDoc.GetDefaultPageSize())).ShowTextAligned(paragraph, 297, 500, 1, TextAlignment.CENTER, VerticalAlignment.TOP, 0)
canvasWatermark2.Close()
paragraph = (New Paragraph("This TRANSPARENT watermark is added ON TOP OF the existing content")).SetFont(font).SetFontSize(15)
over.SaveState()
' Creating a dictionary that maps resource names to graphics state parameter dictionaries
Dim gs1 As New PdfExtGState()
gs1.SetFillOpacity(0.5F)
over.SetExtGState(gs1)
Dim canvasWatermark3 As Canvas = (New Canvas(over, pdfDoc.GetDefaultPageSize())).ShowTextAligned(paragraph, 297, 450, 1, TextAlignment.CENTER, VerticalAlignment.TOP, 0)
canvasWatermark3.Close()
over.RestoreState()
pdfDoc.Close()
End Sub
End Class
IronPDF 简单直观的 API 让用户可以快速地为 PDF 文件应用自定义水印,同时让他们对过程拥有完全控制权。 它使用 HTML/CSS 进一步简化了过程,同时不失对自定义的控制。 iText在PDF中添加水印的方法需要更多的手动工作来完成任务,这可能会减慢进程。
有些时候需要在PDF页面上(加盖文本或图像),就像可能需要在PDF文件上应用水印一样。 我们现在将比较IronPDF和iText在PDF文档上盖章内容的表现。
IronPDF
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");
// Create image stamper
ImageStamper imageStamper = new ImageStamper(new Uri("https://ironpdf.com/img/svgs/iron-pdf-logo.svg"))
{
VerticalAlignment = VerticalAlignment.Top,
};
// Stamp the image stamper
pdf.ApplyStamp(imageStamper, 0);
pdf.SaveAs("stampImage.pdf");
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");
// Create image stamper
ImageStamper imageStamper = new ImageStamper(new Uri("https://ironpdf.com/img/svgs/iron-pdf-logo.svg"))
{
VerticalAlignment = VerticalAlignment.Top,
};
// Stamp the image stamper
pdf.ApplyStamp(imageStamper, 0);
pdf.SaveAs("stampImage.pdf");
Imports IronPdf
Imports IronPdf.Editing
Private renderer As New ChromePdfRenderer()
Private pdf As PdfDocument = renderer.RenderHtmlAsPdf("<h1>Example HTML Document!</h1>")
' Create text stamper
Private 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")
' Create image stamper
Dim imageStamper As New ImageStamper(New Uri("https://ironpdf.com/img/svgs/iron-pdf-logo.svg")) With {.VerticalAlignment = VerticalAlignment.Top}
' Stamp the image stamper
pdf.ApplyStamp(imageStamper, 0)
pdf.SaveAs("stampImage.pdf")
iText
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
public void StampPDF(string inputPdfPath, string outputPdfPath, string stampText)
{
PdfDocument pdfDoc = new PdfDocument(new PdfReader(inputPdfPath), new PdfWriter(outputPdfPath));
Document doc = new Document(pdfDoc);
// Add stamp (text) to each page
int numPages = pdfDoc.GetNumberOfPages();
for (int i = 1; i <= numPages; i++)
{
doc.ShowTextAligned(new Paragraph(stampText),
36, 36, i, iText.Layout.Properties.TextAlignment.LEFT,
iText.Layout.Properties.VerticalAlignment.TOP, 0);
}
doc.Close();
}
using iText.Kernel.Pdf;
using iText.Layout;
using iText.Layout.Element;
public void StampPDF(string inputPdfPath, string outputPdfPath, string stampText)
{
PdfDocument pdfDoc = new PdfDocument(new PdfReader(inputPdfPath), new PdfWriter(outputPdfPath));
Document doc = new Document(pdfDoc);
// Add stamp (text) to each page
int numPages = pdfDoc.GetNumberOfPages();
for (int i = 1; i <= numPages; i++)
{
doc.ShowTextAligned(new Paragraph(stampText),
36, 36, i, iText.Layout.Properties.TextAlignment.LEFT,
iText.Layout.Properties.VerticalAlignment.TOP, 0);
}
doc.Close();
}
Imports iText.Kernel.Pdf
Imports iText.Layout
Imports iText.Layout.Element
Public Sub StampPDF(ByVal inputPdfPath As String, ByVal outputPdfPath As String, ByVal stampText As String)
Dim pdfDoc As New PdfDocument(New PdfReader(inputPdfPath), New PdfWriter(outputPdfPath))
Dim doc As New Document(pdfDoc)
' Add stamp (text) to each page
Dim numPages As Integer = pdfDoc.GetNumberOfPages()
For i As Integer = 1 To numPages
doc.ShowTextAligned(New Paragraph(stampText), 36, 36, i, iText.Layout.Properties.TextAlignment.LEFT, iText.Layout.Properties.VerticalAlignment.TOP, 0)
Next i
doc.Close()
End Sub
IronPDF 能帮助您将文本或图像添加到PDF中,并提供高度灵活和可自定义的方式。 它让您完全掌控。 操作 API 非常简单易懂,特别是对于熟悉 HTML/CSS 的开发者来说。 iText 利用其图像和文本盖章工具,给予用户对其 PDF 文件中显示内容的更多控制,尽管该过程可能更偏向于手动操作。
有时候,您可能需要将PDF文件从一种格式转换为另一种格式。 在这种情况下,我们正在查看使用IronPDF进行DOCX到PDF的转换,并比较IronPDF和iText如何以不同方式处理此过程。
IronPDF
using IronPdf;
// Instantiate Renderer
DocxToPdfRenderer renderer = new DocxToPdfRenderer();
// Render from DOCX file
PdfDocument pdf = renderer.RenderDocxAsPdf("Modern-chronological-resume.docx");
// Save the PDF
pdf.SaveAs("pdfFromDocx.pdf");
using IronPdf;
// Instantiate Renderer
DocxToPdfRenderer renderer = new DocxToPdfRenderer();
// Render from DOCX file
PdfDocument pdf = renderer.RenderDocxAsPdf("Modern-chronological-resume.docx");
// Save the PDF
pdf.SaveAs("pdfFromDocx.pdf");
Imports IronPdf
' Instantiate Renderer
Private renderer As New DocxToPdfRenderer()
' Render from DOCX file
Private pdf As PdfDocument = renderer.RenderDocxAsPdf("Modern-chronological-resume.docx")
' Save the PDF
pdf.SaveAs("pdfFromDocx.pdf")
iText
iText本身无法处理DOCX到PDF的转换; 相反,它依赖于外部库,如DocX或Aspose.Words。
IronPDF 为开发人员提供了一种简单明了的工具,用于处理 DOCX 到 PDF 的转换任务,使得在不需要外部库的情况下,轻松将 DOCX 文件转换为 PDF 格式。 iText,另一方面,依赖外部库来执行此任务。
有关更详细的示例,请访问IronPDF 从 HTML 创建 PDF 的示例。
IronPDF 许可选项 具有不同级别和附加功能用于购买许可证。 开发者还可以购买Iron Suite,它以两个产品的价格提供Iron Software所有产品的访问权限。 如果您还没准备好购买许可证,IronPDF 提供 免费试用版,有效期为 30 天。
Iron Suite:价格为 $1,498,您可以访问所有 Iron Software 产品,包括 IronPDF, IronOCR, IronWord, IronXL, IronBarcode, IronQR, IronZIP, IronPrint 和 IronWebScraper。
更新:iText 提供定期更新和改进。
有关IronPDF文档和支持的更多信息,请访问IronPDF文档和Iron Software YouTube频道。
在.NET的PDF操作工具领域中,IronPDF和iText都提供了针对各种开发需求的强大功能。 IronPDF在多个平台(包括.NET Core、Framework 和 Standard)上的简单集成上脱颖而出,还包括诸如HTML到PDF转换和高级安全选项等全面功能。 另一方面,以其Java传统著称的iText提供强大的PDF生成和操作工具,支持开源和商业许可证,强调多功能性和可定制性。
在这些工具之间的选择最终取决于项目需求、许可偏好和所需的技术支持水平。 无论是选择 IronPDF 的简单灵活性还是选择开源 PDF 库 iText 的广泛功能集,开发人员都有充足的资源来有效地简化其应用中的 PDF 工作流程。
您可以尝试30天免费试用以查看他们提供的功能。