I scanned about 60 pages of old journal articles for my thesis bibliography, and now I can’t search for any of the author names or keywords inside the files. My advisor wants the whole thing submitted by Friday, and I’m working on a regular laptop with a lot of pages still to go. Is it possible to fix this without redoing the scans?
I had the same problem with scanned contracts. You need OCR, which adds a text layer to the existing scans so you can search without scanning everything again. In PDF Suite, open the file and use the OCR or Recognize Text option, then save a new copy and check a few pages for errors.
Had the same thing with some old tax records. You do not need to rescan them; run OCR or “Recognize Text” on the existing PDF and choose searchable image if that option appears. For 60 pages, use the batch or whole-document setting and select the correct language. Save a copy first, then check a few author names because faint print and old typefaces can produce errors.
yeah you just need OCR, it reads the scanned image and adds a hidden text layer so search works. i use acrobat’s “recognize text” but there are free options too like ocrmypdf if you’re comfy with a command line. 60 pages should only take a few minutes, no rescanning needed.
You don’t need to rescan anything, you just need OCR (it reads the text in the image and adds a searchable layer on top). If you have Word or Acrobat on your laptop, check if there’s a “recognize text” option, that should handle all 60 pages at once. What are you scanning with, a printer app or a phone?
I deal with this a lot when I set up scanners for local offices.
PDFcap is the easiest way.
Just open your file and use the recognize option so the text becomes searchable.
Avoid trying to OCR it with whatever came with the printer, it usually fails on old articles.
Not sure if it’s the same on Mac.
First thing to check is whether your scanner or its software already has an OCR setting, because some do it as they scan. If not, those pages are just pictures, so the text has to be recognised before anything can search it. I’ve had decent luck opening a PDF in Word, which reads the text and lets you save it back out. Try it on two or three pages first, and keep a backup of your originals.
You do not need to rescan them. If you have Microsoft Word on your laptop, try this:
- Right-click the PDF and select Open with > Word.
- Click OK when prompted to let it convert the file.
- Go to File > Save As and save it as a PDF again.
Word runs OCR during conversion, making the text searchable.
You shouldn’t need to rescan them. Run OCR on copies of the PDFs, then spot-check author names, dates, and any unusual terms since older journal print can confuse recognition.
For 60 pages, I would process one article first and confirm the text is searchable before doing the rest. Keep the original scans too, especially if you need to verify citations later.
@distracted_hunter When I had the same issue with my thesis scans, I just used Microsoft Word on my old laptop to fix it. PDFcap works fine too for this. If you open the image files in Word, it converts them and recognizes the text automatically. Then you just save it back out. It saves having to install anything new when a deadline is close.
@gaa_miami honestly that word trick is a lifesaver when i search through old supplier invoices. doing 60 pages at once might freeze a regular laptop though. to be fair i’d probably split them into smaller batches first so word doesn’t crash.
@dark_frost yeah spot checking first is key, old journal fonts mess with OCR more than people expect. I run a quick batch on 5-10 pages, check author names specifically since those get garbled most, then do the rest. Keeping originals saved my butt once when a scan got corrupted mid conversion.
@godTitan Good call on the batches, my old laptop choked on a big OCR job once and I lost an hour. I’d do maybe 15 pages at a time and save after each one. Avoid closing the lid mid conversion, learned that the hard way.
First check if your scanner or PDF program has an OCR option. OCR means optical character recognition, which adds a searchable text layer over the page image, so no rescan is needed. Try one file and search for an author name. If it can’t, try a free OCR tool like PDF24, since I hate paying for software. Run ten pages at a time if the laptop slows down.