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    <p>I've used <a href="http://pdftohtml.sourceforge.net/" rel="noreferrer">pdftohtml</a> to successfully strip tables out of PDF into CSV. It's based on <a href="http://www.foolabs.com/xpdf/portsntools.html" rel="noreferrer">Xpdf</a>, which is a more general purpose tool, that includes <a href="http://en.wikipedia.org/wiki/Pdftotext" rel="noreferrer">pdftotext</a>. I just wrap it as a Process.Start call from C#.</p> <p>If you're looking for something a little more DIY, there's the <a href="http://itextsharp.sourceforge.net/" rel="noreferrer">iTextSharp</a> library - a port of Java's <a href="http://www.1t3xt.com/products/index.php" rel="noreferrer">iText</a> - and <a href="http://www.pdfbox.org/" rel="noreferrer">PDFBox</a> (yes, it says Java - but they have a .NET version by way of <a href="http://www.ikvm.net/" rel="noreferrer">IKVM.NET</a>). Here's some CodeProject articles on using <a href="http://www.codeproject.com/KB/cs/PDFToText.aspx" rel="noreferrer">iTextSharp</a> and <a href="http://www.codeproject.com/KB/string/pdf2text.aspx" rel="noreferrer">PDFBox</a> from C#.</p> <p>And, if you're <em>really</em> a masochist, you could call into Adobe's <a href="http://www.adobe.com/support/downloads/detail.jsp?ftpID=2611" rel="noreferrer">PDF IFilter</a> with COM interop. The <a href="http://msdn.microsoft.com/en-us/library/ms691105.aspx" rel="noreferrer">IFilter specs</a> is pretty simple, but I would guess that the interop overhead would be significant.</p> <p>Edit: After re-reading the question and subsequent answers, it's become clear that the OP is dealing with <em>images</em> in his PDF. In that case, you'll need to extract the images (the PDF libraries above are able to do that fairly easily) and run it through an OCR engine. </p> <p>I've used <a href="http://en.wikipedia.org/wiki/Microsoft_Office_Document_Imaging" rel="noreferrer">MODI</a> interactively before, with decent results. It's COM, so calling it from C# via interop is also <a href="http://secure.codeproject.com/KB/office/OCRSampleApplication.aspx" rel="noreferrer">doable</a> and pretty <a href="http://msdn.microsoft.com/en-us/library/aa167607.aspx" rel="noreferrer">simple</a>:</p> <pre><code>' lifted from http://en.wikipedia.org/wiki/Microsoft_Office_Document_Imaging Dim inputFile As String = "C:\test\multipage.tif" Dim strRecText As String = "" Dim Doc1 As MODI.Document Doc1 = New MODI.Document Doc1.Create(inputFile) Doc1.OCR() ' this will ocr all pages of a multi-page tiff file Doc1.Save() ' this will save the deskewed reoriented images, and the OCR text, back to the inputFile For imageCounter As Integer = 0 To (Doc1.Images.Count - 1) ' work your way through each page of results strRecText &amp;= Doc1.Images(imageCounter).Layout.Text ' this puts the ocr results into a string Next File.AppendAllText("C:\test\testmodi.txt", strRecText) ' write the OCR file out to disk Doc1.Close() ' clean up Doc1 = Nothing </code></pre> <p>Others like <a href="http://code.google.com/p/tesseract-ocr/" rel="noreferrer">Tesseract</a>, but I have direct experience with it. I've heard both good and bad things about it, so I imagine it greatly depends on your source quality.</p>
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    1. COThis was an excellent list of resources.. thanks
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