OCR a PDF Online
Run OCR on a scanned PDF so the text becomes selectable.
Drop files here, or click to browse
We add a hidden text layer with Tesseract — the visual layout is unchanged.
Max 50 MB per file
OCR PDF makes scanned PDFs searchable and selectable. ConvertDa's free OCR PDF tool uses Tesseract to recognize text in image-based PDFs — turning a flat scan into a fully searchable document you can copy, paste, and feed to other converters.
How to ocr pdf
- 1
Upload your scanned PDF.
- 2
ocrmypdf / Tesseract adds a hidden text layer.
- 3
Download the searchable PDF.
Frequently asked questions
Which languages are supported?▾
English by default. Add more Tesseract language packs to the worker image to extend.
Does the layout change?▾
No — OCR adds a hidden text layer; the visual appearance is untouched.
Which languages does OCR PDF support?▾
English, Spanish, French, German, Portuguese, Italian, Hindi, Tamil, and many more. Pick the language that matches your document for best accuracy.
Will OCR change the visual look of my PDF?▾
No. The original page images are preserved. OCR adds an invisible text layer underneath that makes the content searchable and selectable.
How accurate is OCR on poor-quality scans?▾
Clean printed text scans at 300 DPI typically reach 95-99% accuracy. Faded, skewed, or low-resolution scans drop into the 80% range. Re-scan at higher resolution if accuracy matters.