What is PDF OCR? Turning scans into copyable text
How scanned PDFs differ from text-layer PDFs, and how browser-side extraction works.
Many scans are full-page images inside a PDF — you cannot select text until OCR runs.
If the PDF already has a text layer, extraction is faster and usually more accurate.
This tool runs locally: prefer the text layer, then rasterize and OCR scan pages.
You get plain text for copying — not a searchable dual-layer PDF.