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Free OCR PDF App

I have numerous PDF files that I need to research for keywords. I want to turn these PDF files into OCR PDF files. is there an app, preferably free, that can do this - and in an ideal world do it in batch/bulk?
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mythology8
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mythology8
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Joe Winograd, EE Fellow 2017, MVE 2016, MVE 2015DeveloperCommented:
Well, it's not free, but for 40 bucks, it's extremely good and well worth the price:
http://www.newegg.com/Product/Product.aspx?Item=N82E168168677800SF

I've been using PaperPort for more than 15 years with great success:
http://nuance.com/for-individuals/by-product/paperport/index.htm

The new Version is 14 (there was no 13 – they got superstitious), but the main improvement in 14 is cloud support, which I doubt you'll need. Version 12 supports XP and even 64-bit W7 (I'm running it in 64-bit W7 with no problems). It has built-in OCR that will create Searchable PDF Image files. The OCR has excellent accuracy, as it uses the SDK from their OmniPage product. You can easily convert an entire folder at a time. Just select all of the docs in a folder and run the Save As command, selecting the Searchable PDF Image file type. It will automatically invoke the OCR to create the searchable text. It will give each new file the same name as the old file, so when you do the Save As, point it to a different folder from where the originals are. When you're happy with new (searchable text) PDFs, you can delete the old (image-only) PDFs. Regards, Joe
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