iText7 Read PDF in C# Alternatives (VS IronPDF)

PDF is a portable document format created by Adobe Acrobat Reader, widely used for sharing information digitally over the internet. It preserves the formatting of data and provides features like setting security permissions and password protection. As a C# developer, you may have encountered scenarios where integrating PDF functionality into your software application is necessary. Building it from scratch can be a time-consuming and tedious task. Therefore, considering the performance, effectiveness, and efficiency of the application, the trade-off between creating a new service from scratch or using a prebuilt library is significant.

There are several PDF libraries available for C#. In this article, we will explore two of the most popular PDF libraries for reading PDF documents in C#.

iText software

iText 7, formerly known as iText 7 Core, is a PDF library to program PDF documents in .NET C# and Java. It is available as an open source license (AGPL) and can be licensed for commercial applications.

iText Core is a high-level API that provides easy methods to generate and edit PDFs in all possible ways. With iText 7 Core, you can split, merge, annotate, fill forms, digitally sign, and do much more on PDF files. iText 7 provides an HTML to PDF converter.

IronPDF

Learn more about IronPDF is a .NET and .NET Framework C# and Java API used for generating PDF documents from HTML, CSS, and JavaScript either from a URL, HTML files, or HTML strings. IronPDF allows you to manipulate existing PDF files like splitting, merging, annotating, digitally signing, and much more.

IronPDF is enriched with 50+ features to create, read, and edit PDF files. It prioritizes speed, ease of use, and accuracy when you need to deliver high-quality, pixel-perfect professional PDF files with Adobe Acrobat Reader. The API is well documented, and a lot of sample source code can be found on its code examples page.

Create a Console Application

We are going to use Visual Studio 2022 IDE for creating an application to start with. Visual Studio is the official IDE for C# development, and you must have it installed. You can download it from the Microsoft Visual Studio website if not installed.

The following steps will create a new project named "DemoApp".

1. Open Visual Studio and click on "Create a New Project".

   

2. Select "Console Application" and click "Next".

   

3. Set the name of the project.

   

4. Select the .NET version. Choose the stable version .NET 6.0.

   

Install IronPDF Library

Once the project is created, the IronPDF library needs to be installed in the project to use it. Follow these steps to install it.

1. Open NuGet Package Manager, either from solution explorer or Tools.

   

2. Browse for IronPDF Library and select it for the current project. Click Install.

   

Add the following namespace at the top of Program.cs file:

using IronPdf;

using IronPdf;

Imports IronPdf

Install iText 7 Library

Once the project is created, the iText 7 library needs to be installed in the project to use it. Follow the steps to install it.

1. Open NuGet Package Manager either from solution explorer or Tools.

   

2. Browse for iText 7 Library and select it for the current project. Click install.

   

Add the following namespaces at the top of Program.cs file:

using iText.Kernel.Pdf.Canvas.Parser.Listener;
using iText.Kernel.Pdf.Canvas.Parser;
using iText.Kernel.Pdf;

using iText.Kernel.Pdf.Canvas.Parser.Listener;
using iText.Kernel.Pdf.Canvas.Parser;
using iText.Kernel.Pdf;

Imports iText.Kernel.Pdf.Canvas.Parser.Listener
Imports iText.Kernel.Pdf.Canvas.Parser
Imports iText.Kernel.Pdf

Open PDF files

We are going to use the following PDF file to extract text from it. It is a two-page PDF document.

Using iText library

To open a PDF file using the iText library is a two-step process. First, we create a PdfReader object and pass the file location as a parameter. Then we use the PdfDocument class to create a new PDF document. The code goes as follows:

// Initialize a reader instance by specifying the path of the PDF file
PdfReader pdfReader = new PdfReader("sample.pdf");

// Initialize a document instance using the PdfReader
PdfDocument pdfDoc = new PdfDocument(pdfReader);

// Initialize a reader instance by specifying the path of the PDF file
PdfReader pdfReader = new PdfReader("sample.pdf");

// Initialize a document instance using the PdfReader
PdfDocument pdfDoc = new PdfDocument(pdfReader);

' Initialize a reader instance by specifying the path of the PDF file
Dim pdfReader As New PdfReader("sample.pdf")

' Initialize a document instance using the PdfReader
Dim pdfDoc As New PdfDocument(pdfReader)

Using IronPDF

Opening PDF files using IronPDF is easy. Use the PdfDocument class's FromFile method to open PDFs from any file location. The following one-line code opens a PDF file for reading data:

// Open a PDF file using IronPDF and create a PdfDocument instance
var pdf = PdfDocument.FromFile("sample.pdf");

// Open a PDF file using IronPDF and create a PdfDocument instance
var pdf = PdfDocument.FromFile("sample.pdf");

' Open a PDF file using IronPDF and create a PdfDocument instance
Dim pdf = PdfDocument.FromFile("sample.pdf")

Read Data from PDF files

Using iText7 library

To read PDF data is not that straightforward in the iText 7 library. We have to manually loop through each page of the PDF document to extract text from each page. The following source code helps to extract text from the PDF document page by page:

// Iterate through each page and extract text
for (int page = 1; page <= pdfDoc.GetNumberOfPages(); page++)
{
    // Define the text extraction strategy
    ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();

    // Extract text from the current page using the strategy
    string pageContent = PdfTextExtractor.GetTextFromPage(pdfDoc.GetPage(page), strategy);

    // Output the extracted text to the console
    Console.WriteLine(pageContent);
}

// Close document and reader to release resources
pdfDoc.Close();
pdfReader.Close();

// Iterate through each page and extract text
for (int page = 1; page <= pdfDoc.GetNumberOfPages(); page++)
{
    // Define the text extraction strategy
    ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();

    // Extract text from the current page using the strategy
    string pageContent = PdfTextExtractor.GetTextFromPage(pdfDoc.GetPage(page), strategy);

    // Output the extracted text to the console
    Console.WriteLine(pageContent);
}

// Close document and reader to release resources
pdfDoc.Close();
pdfReader.Close();

' Iterate through each page and extract text
Dim page As Integer = 1
Do While page <= pdfDoc.GetNumberOfPages()
	' Define the text extraction strategy
	Dim strategy As ITextExtractionStrategy = New SimpleTextExtractionStrategy()

	' Extract text from the current page using the strategy
	Dim pageContent As String = PdfTextExtractor.GetTextFromPage(pdfDoc.GetPage(page), strategy)

	' Output the extracted text to the console
	Console.WriteLine(pageContent)
	page += 1
Loop

' Close document and reader to release resources
pdfDoc.Close()
pdfReader.Close()

There is a lot going on in the code above. First, we declare the Text Extraction Strategy, and then we use the PdfExtractor class's GetTextFromPage method to read text. This method accepts two parameters: the first one is the PDF document page, and the second one is the strategy. To get the PDF document page, use the instance of PdfDocument to call the GetPage method and pass the page number as a parameter. The output is returned as a string, which is then displayed on the console output screen. Finally, the PDFReader and PdfDocument objects are closed. Also, look at the following code example on extracting text from PDF using iText7.

Output

Using IronPDF

Just like opening the PDF file was one line of code, similarly, reading text from a PDF file is also a one-line process. The PDFDocument class provides the ExtractAllText method to read the entire content from the PDF. Console.WriteLine is used to print the text on the screen. The code is as follows:

// Extract all text from the PDF document
string text = pdf.ExtractAllText();

// Display the extracted text
Console.WriteLine(text);

// Extract all text from the PDF document
string text = pdf.ExtractAllText();

// Display the extracted text
Console.WriteLine(text);

' Extract all text from the PDF document
Dim text As String = pdf.ExtractAllText()

' Display the extracted text
Console.WriteLine(text)

Output

The output is accurate and without any errors. However, to use the ExtractAllText method, you need to have a license as it only works in production mode. You can get your trial license key for 30 days from the IronPDF trial license page.

Comparison

In comparison, both libraries give 100% accurate results while extracting text from a PDF document. They are identical when it comes to accuracy. However, IronPDF is more efficient in terms of performance and code readability.

IronPDF only takes two lines of code to achieve the same task as iText. It provides text extraction methods out of the box without any extra logic to be implemented. iText code is a bit tricky, and you have to close the two instances created at the time of opening a PDF document. Whereas, IronPDF clears the memory automatically once the task is performed.

Summary

In this article, we looked at how to read PDF documents using the iText library in C# and then compared it with IronPDF. Both libraries give accurate results and provide numerous PDF manipulation methods to work with. You can create, edit, and read data from PDF files using both of these libraries.

iText is open source and free to use but with restrictions. It can be licensed for commercial use. IronPDF is also free to use and can be licensed for commercial activities with a 30-day free trial available.

Download IronPDF and give it a try.