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Published September 27, 2021

Aspose PDF Converter Tutorial and Comparison

In this article I will examine how to work with the Aspose PDF converter in .NET by comparing its programming structure, provided functions, licensing and pricing packages. Follow the step-by-step tutorials and use the code examples to see for yourself which library is best for working with PDFs in your C# project.

Convert your webpages into PDF documents quickly and easily using the IronPDF library for C# and Java. IronPDF supports all forms of HTML content and renders them with pixel-perfect precision. No fuss. No stress. This library just simply works.

Read more about IronPDF for C# below; refer to the product webpage for more information about IronPDF for Java.

Compare Aspose PDF Functions

• Compare Pricing & Licensing options
• Convert HTML String to PDF
• Convert HTML File to PDF document
• Add headers, footers, and styling
• Add a watermark and more functions

About Aspose PDF API

Aspose API provider is a file format component provider company. The specialized component Aspose PDF DLL is used to deal with PDF files. It allows developers to create and manipulate PDF files programmatically. You can convert PDF file to different file formats. We can also use it to add Watermarks, Text Stamps, Bookmarks, compress PDF files, digitally sign PDF documents, convert PDF documents, print PDF documents, decrypt PDF documents and manage PDF forms in PDF document without using Adobe Acrobat.

About IronPDF

IronPDF C# Library is provided by Iron Software for generating, editing, and manipulating PDF files in .NET projects. It is known well because it requires only a few lines of code with a simple programming structure to get the required PDF files. By using it, we can easily generate PDF files from many sources (such as HTML String, HTML Files, or URLs), and then set its properties (such as Page Number, Headers, Page Margins or Watermarks and more). PDF processing capabilities of IronPDF are at extreme level. It supports custom font handling. To add PDF processing capabilities in a Java application, IronPDF is the best choice.

IronPDF is also available for Java.

1. Aspose.PDF Licensing and Pricing

When we need to purchase APIs for our project, pricing and licensing packages can play a very important role in the selection.

Here we compare the main 4 perpetual licenses provided by Aspose PDF to their IronPDF counterparts.

While Aspose offers multiple tiers of support pricing, IronPDF offers more affordable licenses, customizable options, and free support for all coverage.
Aspose PDF Supported Platforms

Let's look at the supported framework and platforms of Aspose.PDF.

Aspose PDF Supported Frameworks

• .NET Framework 2.0 or above
• .NET Core 2.0
• .NET Core 2.1

Aspose PDF Supported Platforms

• Windows
• macOS
• Linux
• Azure

Aspose PDF Dependencies

If we want to use the Aspose.PDF component in our project, then we need to make sure that we fulfill the dependencies in our Visual Studio Project:

Aspose PDF for .NET Framework 4.0

• No dependencies.

Aspose PDF For .NET Standard 2.0

• Microsoft.Extensions.DependencyModel (>= 2.0.4)
• System.Diagnostics.PerformanceCounter (>= 4.5.0)
• System.Drawing.Common (>= 4.7.0)
• System.Reflection.Emit (>= 4.7.0)
• System.Security,Cryptography.Pkcs (>= 4.7.0)
• System.Security.Permissions (>= 4.5.0)
• System.Text.Encoding.CodePages (>= 4.5.0)

Aspose PDF For .NET Standard 2.1

• Microsoft.Extensions.DependencyModel (>= 2.0.4)
• System.Diagnostics.PerformanceCounter (>= 4.5.0)
• System.Drawing.Common (>= 4.7.0)
• System.Security.Cryptography.Pkcs (>= 4.7.0)
• System.Security.Permissions (>= 4.5.0)
• System.Text.Encoding.CodePages (>= 4.5.0)

IronPDF Supported Platforms

.NET framework 4.0 or above for:

• Windows
• Azure

.NET Standard 2.0 & Core 2, 3 & 5:

• Windows
• macOS
• Linux
• Azure

Cloud hosting services included:

• Microsoft Azure
• Docker
• AWS

IronPDF can be used with:

• ASP.NET MVC Application
• ASP.NET Web Forms Application
• Console Application
• Cloud Application
• Service
• Function
• Desktop Application.

IronPDF Dependencies

IronPDF for .NET Framework 4.0

Iron.Assets.Rendering.Windows (>= 20.0.0)

IronPDF for .NET Standard 2.0 or above

• Iron.Assets.Rendering.Universal (>= 20.0.0)
• System.Drawing.Common (>= 4.7.0)

Step 1 Installation

Aspose PDF Download

There are two possible ways that we can use Aspose.PDF components in our project, and there is no difference whichever one you choose.

Aspose.PDF Download via NuGet Package

Open the NuGet Package Manager of your project in Visual Studio and browse Aspose.Pdf, then install it.

PM > Install-Package Aspose.Pdf

Install with Aspose.PDF.dll

You can also download Aspose.PDF.dll and extract the downloaded file. It will create some folder and files.

• Go to Bin folder
• Go to the required .NET Framework folder, which includes Aspose.PDF.dll.
• Add the reference of this file in your Visual Studio project.

Now, you can use Aspose.PDF functions and classes using Aspose.Pdf namespace.

Install IronPDF

We can also install IronPDF in our project using two different ways.

Install IronPDF with NuGet

The easiest technique is to add IronPDF in the project.

• Go to NuGet Package Manager in Visual Studio project and browse IronPDF
• Install IronPDF

PM > Install-Package IronPdf

Download IronPDF.dll

Another option is to download IronPDF.dll, then add its reference to the project. After this, we can use IronPDF classes and provided functions from the using IronPdf namespace.

2. HTML String to PDF

Let's take the first major use case: that we want to create a PDF file by HTML string and save it in the target location. Let's compare the code required and start with IronPDF.

2.1. IronPDF Convert HTML String to PDF

var converter = new IronPdf.ChromePdfRenderer();
string HTML = "<h1>Hello IronPDF!</h1> <h2>Welcome to PDF File</h2> ";
using var PDF = converter.RenderHtmlAsPdf(HTML);
PDF.SaveAs("Sample.pdf");

var converter = new IronPdf.ChromePdfRenderer();
string HTML = "<h1>Hello IronPDF!</h1> <h2>Welcome to PDF File</h2> ";
using var PDF = converter.RenderHtmlAsPdf(HTML);
PDF.SaveAs("Sample.pdf");

Dim converter = New IronPdf.ChromePdfRenderer()
Dim HTML As String = "<h1>Hello IronPDF!</h1> <h2>Welcome to PDF File</h2> "
Dim PDF = converter.RenderHtmlAsPdf(HTML)
PDF.SaveAs("Sample.pdf")

The above code will create a PDF file Sample.pdf and save it in the target location.

Note

• If you do not give the full path and just give the file name as we do in the above example, then the PDF file will be created in the bin\Debug folder of your project.
• In the case that you want to generate the Sample.pdf file in Local Disk E then you can write: PDF.SaveAs("E:\\Sample.pdf");

Read more about how to create PDF from HTML and working with PDF files using IronPDF.

2.2. Aspose PDF Convert HTML String to PDF

using Aspose.Pdf;
static void Main(string[] args)
{
    //Create new document object
    Document doc = new Document();
    //Add a page in document object
    Page page = doc.Pages.Add();
    //Generate HTML String
    string HtmlStr = "<h1>Hello Aspose.PDF!</h1> <h2>Welcome to PDF File</h2> ";
    //Create html fragment by above HTML string
    HtmlFragment HtmlFrg= new HtmlFragment(HtmlStr);
    //Add html fragment as paragraph in document page
    page.Paragraphs.Add(HtmlFrg);        
    //Save the file on target location
    doc.Save("Sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

using Aspose.Pdf;
static void Main(string[] args)
{
    //Create new document object
    Document doc = new Document();
    //Add a page in document object
    Page page = doc.Pages.Add();
    //Generate HTML String
    string HtmlStr = "<h1>Hello Aspose.PDF!</h1> <h2>Welcome to PDF File</h2> ";
    //Create html fragment by above HTML string
    HtmlFragment HtmlFrg= new HtmlFragment(HtmlStr);
    //Add html fragment as paragraph in document page
    page.Paragraphs.Add(HtmlFrg);        
    //Save the file on target location
    doc.Save("Sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

Imports Aspose.Pdf
Shared Sub Main(ByVal args() As String)
	'Create new document object
	Dim doc As New Document()
	'Add a page in document object
	Dim page As Page = doc.Pages.Add()
	'Generate HTML String
	Dim HtmlStr As String = "<h1>Hello Aspose.PDF!</h1> <h2>Welcome to PDF File</h2> "
	'Create html fragment by above HTML string
	Dim HtmlFrg As New HtmlFragment(HtmlStr)
	'Add html fragment as paragraph in document page
	page.Paragraphs.Add(HtmlFrg)
	'Save the file on target location
	doc.Save("Sample.pdf")
	Console.WriteLine("PDF File Successfully Created....")
	Console.ReadKey()
End Sub

The above code will create a new PDF file Sample.pdf, just like we created using IronPDF.

2.3. Difference between Aspose and IronPDF

Using Aspose.PDF, we first need to create a new Page, HtmlFragment, and add it into the page paragraph, and then save it to the target location. IronPDF has no such type of coding structure and provides a way with many fewer lines of code.

Read more about how to Convert PDF with Aspose PDF DLL and working with Aspose.PDF in .NET applications.

3. HTML File to PDF

Now, let's take another use case: create a PDF file from an existing HTML file.

Note: Assume that we have an HTML file MyHtmlFile.html which exists in the bin\Debug folder of the project, and we want to create a PDF file from it.

3.1. IronPDF Convert HTML File to PDF

var converter = new IronPdf.ChromePdfRenderer();
using var PDF = converter.RenderHTMLFileAsPdf("MyHtmlFile.html");
PDF.SaveAs("Sample.pdf");

var converter = new IronPdf.ChromePdfRenderer();
using var PDF = converter.RenderHTMLFileAsPdf("MyHtmlFile.html");
PDF.SaveAs("Sample.pdf");

Dim converter = New IronPdf.ChromePdfRenderer()
Dim PDF = converter.RenderHTMLFileAsPdf("MyHtmlFile.html")
PDF.SaveAs("Sample.pdf")

The above code will create a new PDF file Sample.pdf from the MyHtmlFile.html file.

3.2. Aspose PDF Convert HTML File to PDF

using Aspose.Pdf;
static void Main(string[] args)
{
    //create HTML load option object 
    HtmlLoadOptions options = new HtmlLoadOptions();
    //load HTML file in document object
    Document pdfDocument = new Document("MyHtmlFile.html", options);
    //save to the target location
    pdfDocument.Save("Sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

using Aspose.Pdf;
static void Main(string[] args)
{
    //create HTML load option object 
    HtmlLoadOptions options = new HtmlLoadOptions();
    //load HTML file in document object
    Document pdfDocument = new Document("MyHtmlFile.html", options);
    //save to the target location
    pdfDocument.Save("Sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

Imports Aspose.Pdf
Shared Sub Main(ByVal args() As String)
	'create HTML load option object 
	Dim options As New HtmlLoadOptions()
	'load HTML file in document object
	Dim pdfDocument As New Document("MyHtmlFile.html", options)
	'save to the target location
	pdfDocument.Save("Sample.pdf")
	Console.WriteLine("PDF File Successfully Created....")
	Console.ReadKey()
End Sub

The above code will also create a new PDF file Sample.pdf from MyHtmlFile.html, but here we need to specify HtmlLoadOptions.

Another Comparison of IronPDF and Aspose.PDF

This is the practical URL to PDF conversion comparison using C# .NET APIs IronPDF and Aspose.PDF.

IronPDF

Aspose.PDF

Comparison

Aspose.PDF for .NET is a library used to manipulate PDFs and manage conversions to, and from, PDF to different formats. Aspose.PDF is a similar product to IronPDF, but it has fewer features. In this article we convert a website named medium.com using both IronPDF and Aspose.PDF. Above are the screenshots of the output of both APIs.

Interface design

IronPDF made a nearly pixel-perfect copy of the webpage and rendered all the sidebars and images with high accuracy. On the other hand Aspose.PDF did not perform well based on the fact it left details and images out of the output file.

CSS and JavaScript

IronPDF utilized and rendered all the CSS and JavaScript of the webpage without error. To compare, we found Aspose.PDF misses practically all the medium.com webpage's CSS and JavaScript files. Aspose.PDF was unable to make icons and images appear accurately.

Navigation and Side Bars

Aspose.PDF does not render navigation bars, or sidebars, as shown in the above images. On the other side IronPDF rendered these clearly and did a great job showcasing its abilities to convert URL to HTML.

Images

In this step we review the accuracy of image placement. As we all know, placing images incorrectly can change the meaning of a webpage; and in some cases make the whole purpose of an exercise like this pointless if the result is not accurate. The verdict: Images are in the wrong places in the output generated by Aspose.PDF. In contrast, IronPDF places images with great accuracy.

Conclusion

Aspose.PDF takes nearly 10 times more time than IronPDF but still creates a very low quality PDF from the URL. The Aspose.PDF rendering engine is too slow and of low quality. IronPDF creates high quality PDF from URL in just a few seconds.

4. Work with Headers and Footers

It is a common requirement that we need to add Headers and Footers on PDF pages for different purposes such as including the document name, page numbers, references, date and time, or other similar functions. Both components provide different types of functions to accomplish these:

4.1. IronPDF Headers and Footers Functions

IronPDF has the following properties by which we can easily set Headers and Footers of newly created PDF file pages.

• LeftText to write text on the left side of the Header or Footer.
• RightText to write text on the right side of the Header or Footer.
• CenterText to write text in the center of the Header or Footer.
• FontSize to specify the font size of the text of the Header of Footer.
• FontFamily to specify the font family of the Header or Footer.
• DrawDividerLine to draw a line that separates page content and the Header or Footer.
• Spacing to specify the space between page content and the Header or Footer.

The following example showcases how to use the above properties.

/**
Header Footer Style Functions
anchor-ironpdf-headers-and-footers-functions
**/
using IronPdf;
static void Main(string[] args)
{
    //Create HTML to PDF converter
    var converter = new IronPdf.ChromePdfRenderer();
    //Add Header
    converter.RenderingOptions.TextHeader = new TextHeaderFooter()
    {
        LeftText = "Header Text",
        RightText = "{date} {time}",
    };
    //Add Footer
    converter.RenderingOptions.TextFooter = new TextHeaderFooter()
    {
        RightText = "Footer Text"
        };
    //Add Page Content
    using var PDF = converter.RenderHtmlAsPdf("<h1>Page Content</h2>");
    //save to target location
    PDF.SaveAs("Sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

/**
Header Footer Style Functions
anchor-ironpdf-headers-and-footers-functions
**/
using IronPdf;
static void Main(string[] args)
{
    //Create HTML to PDF converter
    var converter = new IronPdf.ChromePdfRenderer();
    //Add Header
    converter.RenderingOptions.TextHeader = new TextHeaderFooter()
    {
        LeftText = "Header Text",
        RightText = "{date} {time}",
    };
    //Add Footer
    converter.RenderingOptions.TextFooter = new TextHeaderFooter()
    {
        RightText = "Footer Text"
        };
    //Add Page Content
    using var PDF = converter.RenderHtmlAsPdf("<h1>Page Content</h2>");
    //save to target location
    PDF.SaveAs("Sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

'''
'''Header Footer Style Functions
'''anchor-ironpdf-headers-and-footers-functions
'''*
Imports IronPdf
Shared Sub Main(ByVal args() As String)
	'Create HTML to PDF converter
	Dim converter = New IronPdf.ChromePdfRenderer()
	'Add Header
	converter.RenderingOptions.TextHeader = New TextHeaderFooter() With {
		.LeftText = "Header Text",
		.RightText = "{date} {time}"
	}
	'Add Footer
	converter.RenderingOptions.TextFooter = New TextHeaderFooter() With {.RightText = "Footer Text"}
	'Add Page Content
	Dim PDF = converter.RenderHtmlAsPdf("<h1>Page Content</h2>")
	'save to target location
	PDF.SaveAs("Sample.pdf")
	Console.WriteLine("PDF File Successfully Created....")
	Console.ReadKey()
End Sub

The above code will create a PDF file, Sample.pdf, and print Header Text on the left side of the Header, Date Time on the right side of the Header, and Footer Text on the right side of the Footer.

Read more about how to Add Header and Footers in an HTML to PDF conversion with full list of functions provided by IronPDF.

4.2. Aspose PDF Headers and Footers Functions

To deal with Headers and Footers, Aspose.PDF introduced the TextStamp class. By using it, we can easily add Headers and Footers on PDF file pages and set their properties. There are many subclasses of TextStamp, but here we will discuss the basic three classes and their properties which are commonly used in our daily work.

VerticalAlignment (used to set the vertical alignment of TextStamp and has the following properties)

• _None_ for no vertical alignment.
• _Top_ sets the vertical alignment to the top.
• _Center_ sets vertical alignment in the center.
• _Bottom_ sets vertical alignment the bottom. HorizontalAlignment (used to set the horizontal alignment of TextStamp and has the following properties)
• _None_ for no horizontal alignment.
• _Left_ sets horizontal alignment to left.
• _Right_ sets horizontal alignment to right.
• _Center_ sets horizontal alignment in the center.
• _Justify_ Text will be aligned on both left and right margins.
• _FullJustify_ all lines will be left-aligned and right-aligned TextState (used to set the properties of the text, and has some basic properties)
• _Font_ sets the font of the text
• _FontStyles_ sets the font style of the text.
• _FontSize_ sets the font size of the text.
• _Color_ sets the color of the text.
• _Underline_ sets the underline for the text.
• _StrikeOut_ sets the strikeout style for the text.

See the following example for how to use the above properties to set Header and Footer.

using Aspose.Pdf;
static void Main(string[] args)
{
    Document doc = new Document();
    Page page = doc.Pages.Add();
    HtmlFragment html = new HtmlFragment("<h1>Page Content</h2>");
    page.Paragraphs.Add(html);

    //Add Header text
    TextStamp title = new TextStamp("Header Text");
    title.VerticalAlignment = VerticalAlignment.Top;
    title.HorizontalAlignment = HorizontalAlignment.Left;
    title.TextState.FontSize = 20;
    doc.Pages[1].AddStamp(title);

    //Add Header Datetime
    TextStamp datetime = new TextStamp(System.DateTime.Now.ToString());
    datetime.VerticalAlignment = VerticalAlignment.Top;
    datetime.HorizontalAlignment = HorizontalAlignment.Right;
    datetime.TextState.FontSize = 20;
    doc.Pages[1].AddStamp(datetime);

    //Add Footer text
    TextStamp footer = new TextStamp("Footer Text");
    footer.VerticalAlignment = VerticalAlignment.Bottom;
    footer.HorizontalAlignment = HorizontalAlignment.Right;
    footer.TextState.FontSize = 20;
    doc.Pages[1].AddStamp(footer);

    doc.Save("Sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

using Aspose.Pdf;
static void Main(string[] args)
{
    Document doc = new Document();
    Page page = doc.Pages.Add();
    HtmlFragment html = new HtmlFragment("<h1>Page Content</h2>");
    page.Paragraphs.Add(html);

    //Add Header text
    TextStamp title = new TextStamp("Header Text");
    title.VerticalAlignment = VerticalAlignment.Top;
    title.HorizontalAlignment = HorizontalAlignment.Left;
    title.TextState.FontSize = 20;
    doc.Pages[1].AddStamp(title);

    //Add Header Datetime
    TextStamp datetime = new TextStamp(System.DateTime.Now.ToString());
    datetime.VerticalAlignment = VerticalAlignment.Top;
    datetime.HorizontalAlignment = HorizontalAlignment.Right;
    datetime.TextState.FontSize = 20;
    doc.Pages[1].AddStamp(datetime);

    //Add Footer text
    TextStamp footer = new TextStamp("Footer Text");
    footer.VerticalAlignment = VerticalAlignment.Bottom;
    footer.HorizontalAlignment = HorizontalAlignment.Right;
    footer.TextState.FontSize = 20;
    doc.Pages[1].AddStamp(footer);

    doc.Save("Sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

Imports System
Imports Aspose.Pdf
Shared Sub Main(ByVal args() As String)
	Dim doc As New Document()
	Dim page As Page = doc.Pages.Add()
	Dim html As New HtmlFragment("<h1>Page Content</h2>")
	page.Paragraphs.Add(html)

	'Add Header text
	Dim title As New TextStamp("Header Text")
	title.VerticalAlignment = VerticalAlignment.Top
	title.HorizontalAlignment = HorizontalAlignment.Left
	title.TextState.FontSize = 20
	doc.Pages(1).AddStamp(title)

	'Add Header Datetime
	Dim datetime As New TextStamp(DateTime.Now.ToString())
	datetime.VerticalAlignment = VerticalAlignment.Top
	datetime.HorizontalAlignment = HorizontalAlignment.Right
	datetime.TextState.FontSize = 20
	doc.Pages(1).AddStamp(datetime)

	'Add Footer text
	Dim footer As New TextStamp("Footer Text")
	footer.VerticalAlignment = VerticalAlignment.Bottom
	footer.HorizontalAlignment = HorizontalAlignment.Right
	footer.TextState.FontSize = 20
	doc.Pages(1).AddStamp(footer)

	doc.Save("Sample.pdf")
	Console.WriteLine("PDF File Successfully Created....")
	Console.ReadKey()
End Sub

This will create the same PDF file Sample.pdf as we created using IronPDF: Header Text on the left side of the Header, Date Time on the right side of the Header and Footer Text on the right side of page bottom.

You can compare the ease of working with IronPDF and their simple functions to the list provided by Aspose.

Read more about using Aspose Manage Header and Footer of PDF File.

5. Add Page Numbers to PDF File

Let's suppose that we want to create a PDF file from an HTML string, and then add a page number to the Header of the page.

5.1. IronPDF Add Page Numbers to PDF File

    var converter = new IronPdf.ChromePdfRenderer();
    converter.RenderingOptions.TextHeader = new TextHeaderFooter()
        {
            RightText = "Page {page} of {total-pages}",           
        };
    string html = "<h1 style='text-align:center'>Welcome To IronPdf</h1>";
    using var PDF = converter.RenderHtmlAsPdf(html);
    PDF.SaveAs("Sample.pdf");

    var converter = new IronPdf.ChromePdfRenderer();
    converter.RenderingOptions.TextHeader = new TextHeaderFooter()
        {
            RightText = "Page {page} of {total-pages}",           
        };
    string html = "<h1 style='text-align:center'>Welcome To IronPdf</h1>";
    using var PDF = converter.RenderHtmlAsPdf(html);
    PDF.SaveAs("Sample.pdf");

Dim converter = New IronPdf.ChromePdfRenderer()
	converter.RenderingOptions.TextHeader = New TextHeaderFooter() With {.RightText = "Page {page} of {total-pages}"}
	Dim html As String = "<h1 style='text-align:center'>Welcome To IronPdf</h1>"
	Dim PDF = converter.RenderHtmlAsPdf(html)
	PDF.SaveAs("Sample.pdf")

The above code will create a PDF file Sample.pdf, insert the HTML data, and add the Page Number in the page Header.

Output: Here's a screenshot of our newly created sample.pdf file.

5.2. Aspose PDF Add Page Numbers to PDF File

Aspose.PDF does not provide the predefined function to set Headers and Footers, unlike IronPDF. Using Aspose.PDF, we would need to work with PageNumberStamp and set its alignment for the Header and Footer on the PDF page. See the example below.

using Aspose.Pdf;
static void Main(string[] args)
{
    //Create new document
    Document doc = new Document();
    //New new page of document
    Page page = doc.Pages.Add();
    //Source HTML string
    string html = "<h1 style='text-align:center'>Welcome To Aspose.PDF</h1>";
    //Create HTML fragment for source string
    HtmlFragment frag = new HtmlFragment(html);
    //Add fragment as page paragraph
    page.Paragraphs.Add(frag);
    //Create PageNumberStamp
    PageNumberStamp pageNumberStamp = new PageNumberStamp();
    //Setting its txt to print
    pageNumberStamp.Format = "Page # of " + doc.Pages.Count;
    pageNumberStamp.VerticalAlignment = VerticalAlignment.Top;
    pageNumberStamp.HorizontalAlignment = HorizontalAlignment.Right;
    // Add PageNumberStamp to page
    page.AddStamp(pageNumberStamp);
    //Save document to the target location
    doc.Save("sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

using Aspose.Pdf;
static void Main(string[] args)
{
    //Create new document
    Document doc = new Document();
    //New new page of document
    Page page = doc.Pages.Add();
    //Source HTML string
    string html = "<h1 style='text-align:center'>Welcome To Aspose.PDF</h1>";
    //Create HTML fragment for source string
    HtmlFragment frag = new HtmlFragment(html);
    //Add fragment as page paragraph
    page.Paragraphs.Add(frag);
    //Create PageNumberStamp
    PageNumberStamp pageNumberStamp = new PageNumberStamp();
    //Setting its txt to print
    pageNumberStamp.Format = "Page # of " + doc.Pages.Count;
    pageNumberStamp.VerticalAlignment = VerticalAlignment.Top;
    pageNumberStamp.HorizontalAlignment = HorizontalAlignment.Right;
    // Add PageNumberStamp to page
    page.AddStamp(pageNumberStamp);
    //Save document to the target location
    doc.Save("sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

Imports Aspose.Pdf
Shared Sub Main(ByVal args() As String)
	'Create new document
	Dim doc As New Document()
	'New new page of document
	Dim page As Page = doc.Pages.Add()
	'Source HTML string
	Dim html As String = "<h1 style='text-align:center'>Welcome To Aspose.PDF</h1>"
	'Create HTML fragment for source string
	Dim frag As New HtmlFragment(html)
	'Add fragment as page paragraph
	page.Paragraphs.Add(frag)
	'Create PageNumberStamp
	Dim pageNumberStamp As New PageNumberStamp()
	'Setting its txt to print
	pageNumberStamp.Format = "Page # of " & doc.Pages.Count
	pageNumberStamp.VerticalAlignment = VerticalAlignment.Top
	pageNumberStamp.HorizontalAlignment = HorizontalAlignment.Right
	' Add PageNumberStamp to page
	page.AddStamp(pageNumberStamp)
	'Save document to the target location
	doc.Save("sample.pdf")
	Console.WriteLine("PDF File Successfully Created....")
	Console.ReadKey()
End Sub

Output: Here is the screenshot of newly created sample.pdf file.

6. Add Watermarks

We often need to add Watermarks on our PDF file pages for advertisement, security, or copyright issues. Let's create a PDF file from an HTML string, and then add Watermark using both components.

6.1. IronPDF Add Watermark

To add a watermark on the PDF page, IronPDF provides the WatermarkPage class.

WatermarkPage Definition: WatermarkPage (WatermarkText, PageIndex, WaterMarkLocation, Opacity, Rotation, Hyperlink);

• WatermarkText = the actual text written in HTML which displays as Watermark text.
• PageIndex = write the page number as the Watermark.
• Opacity = set the opacity of the Watermark.
• Rotation = set the rotation of the Watermark content clockwise.
• Hyperlink = hyperlink that the Watermark will link to.
• WaterMarkLocation = set the position of the Watermark, which we can set using the following positions:
• TopLeft
• TopCenter
• TopRight
• MiddleLeft
• MiddleCenter
• MiddleRight
• BottomLeft
• BottomCenter
• BottomRight

Let's see the following example, where we will understand how to use the above functions in our project.

    using IronPdf;

    var converter = new IronPdf.ChromePdfRenderer();
    string html = "<h1 style='text-align:center'>Welcome To IronPdf</h1><h2 style='text-align:center'>Page Content</h2>";
    using var PDF = converter.RenderHtmlAsPdf(html);

    //Create string for Watermark
    string WMStr = "<h1 style='color:red'>Sample WaterMark</h1>";
    //Add Watermark 
    PDF.WatermarkPage(WMStr, 0, PdfDocument.WaterMarkLocation.MiddleCenter,100,-45, "");

    PDF.SaveAs("sample.pdf");

    using IronPdf;

    var converter = new IronPdf.ChromePdfRenderer();
    string html = "<h1 style='text-align:center'>Welcome To IronPdf</h1><h2 style='text-align:center'>Page Content</h2>";
    using var PDF = converter.RenderHtmlAsPdf(html);

    //Create string for Watermark
    string WMStr = "<h1 style='color:red'>Sample WaterMark</h1>";
    //Add Watermark 
    PDF.WatermarkPage(WMStr, 0, PdfDocument.WaterMarkLocation.MiddleCenter,100,-45, "");

    PDF.SaveAs("sample.pdf");

Imports IronPdf

	Private converter = New IronPdf.ChromePdfRenderer()
	Private html As String = "<h1 style='text-align:center'>Welcome To IronPdf</h1><h2 style='text-align:center'>Page Content</h2>"
	Private PDF = converter.RenderHtmlAsPdf(html)

	'Create string for Watermark
	Private WMStr As String = "<h1 style='color:red'>Sample WaterMark</h1>"
	'Add Watermark 
	PDF.WatermarkPage(WMStr, 0, PdfDocument.WaterMarkLocation.MiddleCenter,100,-45, "")

	PDF.SaveAs("sample.pdf")

Output: Here is the screenshot of the newly created sample.pdf file with watermark.

If we want to add a Watermark on multiple pages, but not all, then we can use the WatermarkPages function as follows:

WatermarkPages(WaterMark Text, new[] { PageIndex 1, PageIndex 2,...., PageIndex N }, WaterMarkLocation, Opacity, rotation)

WatermarkPages(WaterMark Text, new[] { PageIndex 1, PageIndex 2,...., PageIndex N }, WaterMarkLocation, Opacity, rotation)

'INSTANT VB TODO TASK: The following line uses invalid syntax:
'WatermarkPages(WaterMark Text, New[] { PageIndex 1, PageIndex 2,...., PageIndex N }, WaterMarkLocation, Opacity, rotation)

If we do want to add a Watermark on all pages, then we can use the WatermarkAllPages() function like this: WatermarkAllPages(WaterMark Text,WaterMarkLocation, opacity, rotation);

Read more about how to add a watermark to PDFs.

6.2. Aspose PDF Add Watermark

Aspose.PDF does not provide a special function to add text as a Watermark, unlike IronPDF. Instead, we need to use the TextStamp class. Let's see how that works.

using Aspose.Pdf;
using Aspose.Pdf.Text;
static void Main(string[] args)
{
    //create new document
    Document pdfDocument = new Document();
    //add new page to document
    Page page = pdfDocument.Pages.Add();
    //source HTML string
    string HtmlStr = "<h1 style='text-align:center'>Welcome To Aspose.PDF</h1><h2 style='text-align:center'>Page Content</h2>";
    //create HTML fragment by source HTML string
    HtmlFragment HtmlFrg = new HtmlFragment(HtmlStr);   
    //add HTML fragment as page paragraph
    page.Paragraphs.Add(HtmlFrg);
    //Watermark string
    string WMStr = "Sample WaterMark";
    //create TextStamp of above string
    TextStamp textStamp = new TextStamp(WMStr);
    //setting TextStamp properties
    textStamp.HorizontalAlignment = HorizontalAlignment.Center;
    textStamp.VerticalAlignment = VerticalAlignment.Center;
    textStamp.RotateAngle = 45;
    textStamp.TextState.Font = FontRepository.FindFont("Times New Roman");
    textStamp.TextState.FontSize = 15F;
    textStamp.TextState.FontStyle = FontStyles.Bold;
    textStamp.TextState.ForegroundColor = Aspose.Pdf.Color.FromRgb(System.Drawing.Color.Red);
    //add to the specific page
    pdfDocument.Pages[1].AddStamp(textStamp);
    //save to the target location
    pdfDocument.Save("sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

using Aspose.Pdf;
using Aspose.Pdf.Text;
static void Main(string[] args)
{
    //create new document
    Document pdfDocument = new Document();
    //add new page to document
    Page page = pdfDocument.Pages.Add();
    //source HTML string
    string HtmlStr = "<h1 style='text-align:center'>Welcome To Aspose.PDF</h1><h2 style='text-align:center'>Page Content</h2>";
    //create HTML fragment by source HTML string
    HtmlFragment HtmlFrg = new HtmlFragment(HtmlStr);   
    //add HTML fragment as page paragraph
    page.Paragraphs.Add(HtmlFrg);
    //Watermark string
    string WMStr = "Sample WaterMark";
    //create TextStamp of above string
    TextStamp textStamp = new TextStamp(WMStr);
    //setting TextStamp properties
    textStamp.HorizontalAlignment = HorizontalAlignment.Center;
    textStamp.VerticalAlignment = VerticalAlignment.Center;
    textStamp.RotateAngle = 45;
    textStamp.TextState.Font = FontRepository.FindFont("Times New Roman");
    textStamp.TextState.FontSize = 15F;
    textStamp.TextState.FontStyle = FontStyles.Bold;
    textStamp.TextState.ForegroundColor = Aspose.Pdf.Color.FromRgb(System.Drawing.Color.Red);
    //add to the specific page
    pdfDocument.Pages[1].AddStamp(textStamp);
    //save to the target location
    pdfDocument.Save("sample.pdf");
    Console.WriteLine("PDF File Successfully Created....");
    Console.ReadKey();
}

Imports Aspose.Pdf
Imports Aspose.Pdf.Text
Shared Sub Main(ByVal args() As String)
	'create new document
	Dim pdfDocument As New Document()
	'add new page to document
	Dim page As Page = pdfDocument.Pages.Add()
	'source HTML string
	Dim HtmlStr As String = "<h1 style='text-align:center'>Welcome To Aspose.PDF</h1><h2 style='text-align:center'>Page Content</h2>"
	'create HTML fragment by source HTML string
	Dim HtmlFrg As New HtmlFragment(HtmlStr)
	'add HTML fragment as page paragraph
	page.Paragraphs.Add(HtmlFrg)
	'Watermark string
	Dim WMStr As String = "Sample WaterMark"
	'create TextStamp of above string
	Dim textStamp As New TextStamp(WMStr)
	'setting TextStamp properties
	textStamp.HorizontalAlignment = HorizontalAlignment.Center
	textStamp.VerticalAlignment = VerticalAlignment.Center
	textStamp.RotateAngle = 45
	textStamp.TextState.Font = FontRepository.FindFont("Times New Roman")
	textStamp.TextState.FontSize = 15F
	textStamp.TextState.FontStyle = FontStyles.Bold
	textStamp.TextState.ForegroundColor = Aspose.Pdf.Color.FromRgb(System.Drawing.Color.Red)
	'add to the specific page
	pdfDocument.Pages(1).AddStamp(textStamp)
	'save to the target location
	pdfDocument.Save("sample.pdf")
	Console.WriteLine("PDF File Successfully Created....")
	Console.ReadKey()
End Sub

Output: And here is the screenshot of the stamped sample.pdf file.

Read more about using Aspose PDF add stamp and watermark in your files and projects.

6.3. Difference between Aspose and IronPDF Watermarking

When talking about Watermarks on selected pages or multiple pages, there are no specified functions when using Aspose.PDF. But we can do it using page iteration of a PDF file with For Loop, While Loop, or ForEach Loop etc. This does create bulky code and requires us to add different conditions if we want to add a Watermark only on select pages.

7. Compare License Options

As developers, we all want to complete our projects with minimal cost and resources, and budget can be especially important. Review the chart to compare what license is right for your needs and budget.

IronPDF offers licenses with a customizable # of developers, projects, and locations, so you can meet the needs of your project and pay only for the coverage you need. Check out the HTML to PDF licenses or contact the support team to get a custom quote and free 30 day deployment trial.

8. Aspose PDF and IronPDF Takeaways

9. Aspose Components Overview

Aspose provides a range of components to suit your project needs. See the full list below and compare to other IronPDF products for competitive pricing and clear & condensed code functions.

Tutorial Quick Access

Explore the IronPDF API Reference

Explore the API Reference for IronPDF C# Library, including details of all of IronPDF�s features, classes, method fields, namespaces, and enums.

View the API Reference