If you cannot search for a word inside a scanned PDF, the file may contain page images instead of selectable text. OCR (optical character recognition) analyzes those images and adds a text layer, making the document searchable and selectable.
What OCR does in Acrobat
Adobe explains that a scan can contain image data without searchable text. In Acrobat, the Scan & OCR tool recognizes text and creates a searchable text layer in the PDF. You can also choose a page range and recognition language, which is useful for long files or multilingual documents.
Run OCR on a scanned PDF
- Save a backup copy of the original scan.
- Open the PDF in Acrobat and select All tools > Scan & OCR.
- Choose In this file, then select the page range and document language.
- Select Recognize Text and save the processed PDF as a new file.
- Search for a few known words and try selecting text to confirm that recognition worked.
Review the OCR result
OCR is a recognition step, not a guarantee that every character is correct. Review names, account numbers, dates, amounts, and columns carefully. Acrobat can flag uncertain words for review; Adobe’s guide describes using the Correct recognized text workflow to inspect and fix them.
- Improve the scan: straighten pages and use a clear, high-resolution image when possible.
- Select the right language: language settings affect recognition, especially for non-Latin scripts.
- Check tables separately: recognized words may be accurate while row and column relationships are not.
- Keep the original: retain an untouched copy in case you need to compare the image and recognized text.
When is OCR useful?
OCR helps when you need to find a phrase in archived records, copy a passage from a scan, or make a paper document easier to work with. For a small number of pages, Acrobat’s single-document workflow is straightforward. Teams processing batches should check the available plan and desktop features, since bulk workflows can vary by product edition.
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Why can I see text but not select or search it?
The page may be an image of text. Run OCR to add a recognized text layer.
Does OCR always recognize every word correctly?
No. Image quality, skew, handwriting, language, and table layout can all affect accuracy. Review the extracted text before using it for important decisions.
Official guides: Recognize text in scanned PDFs · Correct recognized text
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