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Why scanned PDFs are not searchable
A scanned PDF often looks like a normal document, but each page may only be an image. The words you see are pixels, not actual text. That is why search, copy, and selection do not work.
OCR stands for Optical Character Recognition. It analyzes the image of a page, detects letters and words, and creates text from what it finds.
What an invisible text layer does
Most PDF OCR tools keep the original page image and add an invisible text layer on top. The document looks the same, but PDF readers can search and select the hidden text.
This is useful for scanned contracts, receipts, archives, notes, and forms. It makes documents easier to search without changing their visual appearance.
Why OCR is not perfect
OCR accuracy depends on scan quality, language, font, page angle, handwriting, shadows, and image resolution. Clean printed text works best. Handwriting and low-quality photos need more review.
Always review important OCR results before relying on them. Searchability is helpful, but it should not replace reading the original document for critical details.
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