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Extract Text from PDF in C# (100% .NET)

, 20 May 2006
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A simple class to extract plain text from PDF documents with ITextSharp

Introduction

This is a 100% .NET solution to extract text from PDF documents.

Background

Dan Letecky posted a nice code on how to extract text from PDF documents in C# based on PDFBox. Although his solution works well it has a drawback, the size of the required additional libraries is almost 16 MB. Using iTextSharp the size of required additional libraries is only 2.3 MB.

Using the Code

In order to use this solution in your projects, you need to do the following steps:

  • Add references to itextsharp.dll and SharpZiplib.dll
  • Add the PDFParser.cs class to your project

Then you can use the newly added class in the following way:

// create an instance of the pdfparser class
PDFParser pdfParser = new PDFParser();
   
// extract the text
String result = pdfParser.ExtractText(pdfFile);

I also created a small console application which uses the class and shows the progress of the conversion. Please keep in mind that if you try to extract text from big PDF files, keeping all the resultant text in memory is not the best solution, in these cases you should write the extracted text to the file after parsing every page.

How Is It Working?

My code is based on the algorithm in C ExtractPDFText. Using iTextSharp's PdfReader class to extract the deflated content of every page, I use a simple function ExtractTextFromPDFBytes to extract the text contents from the deflated page.

Further Improvements

Although the code worked well for me, I didn't find in Adobe's PDF reference how to parse special characters. So if someone knows how to do this, just post it and I will update the class.

History

  • 20th May, 2006: Initial post

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Zollor
Web Developer
Romania Romania
No Biography provided

Comments and Discussions

 
QuestionTanks a lot! PinmemberKrNeS23-Jan-14 5:41 
QuestionWorks (kind of) PinmemberMember 380812010-Dec-13 1:09 
GeneralGreat job. PinmemberPerry Orr7-Aug-13 17:20 
It works great. Its perfect for simple PDFs. Those complaining about this code should create something better and post it here.
QuestionToo simplistic - why I voted 1 Pinmemberatlaste10-Jul-13 22:28 
AnswerRe: Too simplistic - why I voted 1 PinmemberPerry Orr7-Aug-13 17:22 
GeneralRe: Too simplistic - why I voted 1 Pinmemberatlaste2-Mar-14 21:30 
QuestionHow it work!? Pinmemberreza2168116-Apr-13 6:51 
Questionlayout Pinmembertmac1210-Mar-13 23:32 
QuestionThank you! PinmemberJoseph guidry8-Jan-13 9:15 
SuggestionPdf to text conversion in asp.net PinmemberHighCommand18-Dec-12 8:24 
BugFound bug PinmemberMunissoR24-Apr-12 1:57 
AnswerRe: Found bug Pinmemberfborelli4-Jul-12 8:33 
GeneralGreat Post, Works Great! PinmemberMember 202264516-Apr-12 5:13 
QuestionGreat post! PinmemberEric Castellon9-Apr-12 9:35 
GeneralMy vote of 5 Pinmemberbrinda roy20-Feb-12 23:41 
GeneralMy vote of 1 Pinmembermjkhan78620-Jan-12 21:35 
Questionhow to export data from excel to PDF ? PinmembernimolZero28-Aug-11 6:10 
Questionnot work Pinmembercutithongtin1-Aug-11 14:45 
QuestionDosn't work. Pinmembersasirekam29-Jun-11 19:13 
GeneralAlternate Solution Pinmemberkaaskop7-May-11 3:44 
GeneralRe: Alternate Solution PinmemberWizdave052-Feb-12 9:04 
GeneralRe: Alternate Solution PinmemberMember 864124213-Feb-12 15:45 
GeneralRe: Alternate Solution PinmemberMember 909494814-Aug-12 13:45 
GeneralRe: Alternate Solution PinmemberJames Henze29-Nov-13 5:39 
General(Solved) Error when reading some document (page missing) PinmemberLord TaGoH8-Apr-11 0:13 

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