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How to use OCR PDF
Optical character recognition (OCR) analyses each page image and adds an invisible text layer, making the PDF searchable and copy-pasteable. We use Tesseract 5 for standard documents and automatically route low-confidence pages to Claude Vision for handwriting, stamps, and non-Latin scripts.
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Frequently asked questions
What languages does OCR support?+
Tesseract supports 100+ languages. We surface the 14 most common. For other languages, select the closest match or use the AI Vision fallback (automatic for low-confidence pages).
Will OCR change the appearance of my PDF?+
No. The original page images are preserved. OCR only adds an invisible, searchable text layer underneath.
What accuracy can I expect?+
Clean, printed documents typically achieve 95–99% accuracy. Handwriting, poor-quality scans, and unusual fonts score lower and are automatically sent to AI Vision enhancement.
My PDF already has text — do I still need OCR?+
No. The tool skips pages that already have a text layer, so it's safe to run on mixed PDFs.