I have a 40-page scanned PDF, but searching for words doesn’t find anything, even text I can clearly see. How do I make the text searchable?
Your scan is basically just photos of pages, so there’s no actual text to find. You need OCR, which reads the image and adds a text layer. In Acrobat it’s under Scan & OCR, Recognize Text. Free route: upload to Google Drive and open it with Google Docs, it OCRs automatically.
I had this problem with old clinic records. Your file is just pictures of pages, so it needs OCR (optical character recognition, which turns image text into real text).
What worked for me was pdfcap.com:
- Upload your document to their OCR tool.
- Let it recognise the text.
- Download your new searchable PDF.
You need software that can recognise text in images, like opening the file in Google Drive as a Google Doc to extract the words. I learnt the hard way when digitising my old bakery price lists that a basic scan is just a flat picture. Avoid printing and rescanning it, as that degrades the image. For proper reading, paste that extracted text into an EPUB.
Had the same thing last month with some scanned sheet music notes, same deal, no text layer at all since it’s just images of pages. You need OCR to actually add a text layer underneath the scan. If you have a Mac, Preview sometimes does light OCR automatically, but for 40 pages I would look for something with batch OCR so you are not doing it page by page.
SneakySteel the Google Docs route worked for me too, but my old laptop chugged on 40 pages, so I’d split it into batches of ten first.
@Emily.7 Splitting into batches is a sensible workaround on an older laptop. I’d also keep the original scan untouched and check a few pages after OCR, since faded or crooked text can produce mistakes.
I usually keep a copy of the original, then run OCR on a duplicate. In Adobe Acrobat, use Scan & OCR > Recognize Text; OCRmyPDF is a good free option if you’re comfortable with it. Set the document language correctly, then test a few unusual words afterward, because textbook fonts and faint pages can trip OCR up.
Hi StormCrazy, welcome to the forum! That happens when the PDF is just images, so you’ll need to run OCR on it. Open it in a program like Adobe Acrobat, choose Recognize Text, then save as a new searchable PDF. If you don’t have Acrobat, free options like OCRmyPDF work great for batch files too.
@emily.7 Batching is the right call. I split by page ranges before OCR instead of loading all 40 at once, since a big job just hangs. Then I spot check a few pages, especially any with faint or crooked text, before trusting the search.
yeah its just a picture of the text so search wont work. you need ocr to make it searchable. i hate paying for stuff so i throw it in google drive and open with google docs, that usually does the trick. not sure if its the same on mac