OCR (Optical Character Recognition) turns scanned PDFs — which are just images — into documents with real, selectable, searchable text. Here is everything you need to know.
OCR is technology that analyzes images of text and converts them into machine-readable text characters. When applied to a scanned PDF, OCR creates a text layer over the image — making the document searchable, copyable, and convertible to Word or other formats.
You need OCR when: you cannot select or copy text in a PDF, Ctrl+F search finds nothing in the document, converting the PDF to Word produces blank or empty output, or the PDF was created by scanning paper pages rather than exporting from a digital document.
Go to pdfeditor.onl/ocr-pdf. Upload the scanned PDF. Select the document language. Click Scan All Pages. The Tesseract OCR engine (industry-standard open-source OCR) processes every page. Save the searchable PDF or extract the text.
Tip: OCR accuracy depends on scan quality. Clean, 300+ DPI scans of printed documents achieve 95–99% accuracy. Handwritten text, unusual fonts, or low-quality scans reduce accuracy.
pdfeditor.onl supports 30+ OCR languages including English, French, German, Spanish, Italian, Portuguese, Dutch, Russian, Arabic, Chinese Simplified, Chinese Traditional, Japanese, Korean, Hindi, and more.
Tesseract OCR is designed for printed text. Handwriting recognition accuracy is significantly lower — typically 40–70% depending on handwriting clarity.
Yes — completely free at pdfeditor.onl/ocr-pdf.
No. The page visually remains identical — the text layer is invisible and sits underneath the scanned image.