What Is OCR and When Do You Need It for PDF to Text?

OCR, or optical character recognition, identifies letters inside an image and turns them into machine-readable text.

It matters when a PDF page is a scan, screenshot, fax, or photo instead of real selectable text.

If selecting text in the PDF does nothing, the file likely has no usable text layer. A normal extractor may return an empty file until OCR creates text.

For the bigger workflow, read the PDF to Text guide.

OCR depends on scan resolution, contrast, language, page rotation, noise, handwriting, and font clarity.

After OCR or extraction, use PDF to Text to export and review the result.