Scanned PDFs can silently yield empty text, and OCR should be applied selectively

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PDFs made from scanned images store no text, so text extraction can return near-empty pages without raising any error. The article explains how to detect this by counting characters extracted from each page and checking whether most pages are blank. Pages that are fully empty need OCR or rejection, while partially empty documents should have only their blank pages OCRed. Rendering at 300 dpi, setting the document language, and recording per-page confidence scores are recommended to improve OCR accuracy. The author also warns that OCR is slow and can misread digits, so it should not be applied to every page by default.

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