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I have a bunch of .pdf files of research journals and articles. Unfortunately, these files don't allow me to search within the text. I know some .pdf files allow full text searching, and was wondering if there is any software or some utility that would allow me to do so with these.
I don't know if you've found a solution to this or not, but I might have something that works.
At my job, I've been doing this exact thing: converting TIFF images (scanned documents with some printed text, and some hand-written) to searchable PDFs. I suspect the PDF files contain merely images (as in, they have no searchable or selectable text).
I've been using a (free trial) program called Tiff Junction to batch-convert thousands of these files at a time. I just checked, and it does support converting "image-only PDFs" to searchable PDFs.
The free version does add a small watermark to the top of each converted document, but the watermark is an image and won't disrupt any text-searching you do.
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Acrobat Pro will let you do this, I'm not up on the free-alternatives since I have Acrobat Pro at work, but I'm sure there are some.
[EDIT] Just tried it. It does
At my job, I've been doing this exact thing: converting TIFF images (scanned documents with some printed text, and some hand-written) to searchable PDFs. I suspect the PDF files contain merely images (as in, they have no searchable or selectable text).
I've been using a (free trial) program called Tiff Junction to batch-convert thousands of these files at a time. I just checked, and it does support converting "image-only PDFs" to searchable PDFs.
The free version does add a small watermark to the top of each converted document, but the watermark is an image and won't disrupt any text-searching you do.
Here's the link to the free trial of Tiff Junction:
http://www.aquaforest.com/en/merge_tiff_junction.asp
(just make sure you check the "Searchable PDF" option when you run the program)