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I'm looking to parse some PDF (extract paragraph from them). I used iTextSharp in the past, but it doesn't support .NET Core.

I also tried this lib: https://github.com/VahidN/iTextSharp.LGPLv2.Core but the text extraction doesn't work very nicely. It just writes random words, not in the correct order, with a lot of incorrect symbols, really not usable.

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  • PDF parsing is incredibly difficult, because of (some of the many) ways a PDF can encode text. Like not actually encoding the space character, and just having each word (or character) be positioned. I would suggest that PDF parsing is AI-complete (en.wikipedia.org/wiki/AI-complete) Oct 17, 2017 at 8:31

3 Answers 3

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Essential PDF can be used to load PDFs and extract content from them..NET Core is also supported.

//Load an existing PDF.
PdfLoadedDocument loadedDocument = new PdfLoadedDocument(fileName);
//Load the first page.
PdfPageBase page = loadedDocument.Pages[0];
//Extract text from first page.
string extractedText = page.ExtractText();
//Close the document
loadedDocument.Close(true);

The entire product is available for free with no limitations through the community license if you qualify.

Note: I work for Syncfusion

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  • I dont earn more than a million, so I should be able to benefit from it. I will test this this evening, thank you
    – J4N
    Apr 20, 2017 at 3:39
  • Can I get it from a Nuget package? If not, what DLL should I include to get this PdfLoadedDocumentDLL?
    – J4N
    Apr 20, 2017 at 4:16
  • @J4N: Yes. Nuget feed for .NET Core. The DLLs needed are Syncfusion.Compression.Portable.dll and Syncfusion.Pdf.Portable.dll Apr 20, 2017 at 12:59
  • It seems that I don't have an ExtractTextmethod on the PdfPageBase? What am I missing?
    – J4N
    Apr 20, 2017 at 14:51
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    @J4N: Can you please create a support ticket in the Syncfusion support portal and provide a sample PDF document and the text that you are trying to extract. I am working with the developers to get the functionality ported as soon as possible and have additional details will help. Thanks. Apr 26, 2017 at 19:03
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XFINIUM.PDF library supports text extraction on .NET Core platform.

// Load the PDF document
PdfFixedDocument document = new PdfFixedDocument(input);
// Create a content extractor for the desired page
PdfContentExtractor ce = new PdfContentExtractor(document.Pages[0]);
// Extract text as objects with information about position, font, color, etc
PdfTextFragmentCollection tfc = ce.ExtractTextFragments();
// Or extract the text as a simple string.
string text = ce.ExtractText();

Evaluation version is available for download on nuget.org, package id is xfinium.pdf.netcore.

Disclaimer: I work for the company the develops XFINIUM.PDF library.

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  • Thank you, but it's for a free, very small and open source project, and I cannot afford this kind of fees
    – J4N
    Apr 20, 2017 at 3:36
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PdfLib CORE is a library for modern .NET Core applications to edit and read PDF files.

Snippet from the readme.md:

var dpiX, dpiY = 300D;
var i = 0;

using var pdfDocument = new PdfDocument(File.Open(<<file>>, FileMode.Open));
foreach (var page in pdfDocument.Pages)
{
    using var pdfPage = page;
    var pageWidth = (int) (dpiX * pdfPage.Size.Width / 72);
    var pageHeight = (int) (dpiY * pdfPage.Size.Height / 72);

    using var bitmap = new PdfiumBitmap(pageWidth, pageHeight, true);
    pdfPage.Render(bitmap, PageOrientations.Normal, RenderingFlags.LcdText);
    using var stream = bitmap.AsBmpStream(dpiX, dpiY);
    
    // <<< do something with your stream...>>> 
}

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