A scanned PDF is just images — you can’t search or copy the text. OCR adds a searchable text layer. Learn how to OCR a PDF free in your browser, plus accuracy tips.
A scanned PDF looks like a normal document, but to a computer it's just a stack of images. You can't select the text, search inside it, or copy a paragraph out. OCR (Optical Character Recognition) fixes that — it reads the pixels, recognises the letters, and layers an invisible, selectable text layer over the scan so your PDF becomes fully searchable and copy-pasteable.
When you scan a paper document or photograph a page, the result is a picture of text, not text itself. OCR analyses that image, identifies each character, and writes the recognised words back into the PDF as a hidden text layer aligned with the visual page. The page still looks identical, but now you can:
| Document type | Typical accuracy | Notes |
|---|---|---|
| Clean, high-resolution print scan | 98–99%+ | Best case — crisp black text on white |
| Photocopied or faxed document | 92–97% | Slight noise; usually still very usable |
| Low-resolution phone photo | 85–95% | Improve by re-shooting flat, in good light |
| Handwriting | Varies widely | Print handwriting fares better than cursive |
| Complex tables / multi-column | Good for text, layout may shift | Text is captured; exact column structure can vary |
A searchable PDF is often the first step in a workflow. After OCR you might want to compress the PDF (OCR can increase file size slightly), extract just the pages you need, or convert the recognised content to an editable format like Word. If you only need text out of a single picture rather than a full document, the Image-to-Text OCR tool pulls text straight from an image.
OCR turns a “dead” scanned PDF into a living, searchable document — no retyping required. Scan at 300 DPI, set the right language, and run it through the ToolsGravity PDF OCR tool in your browser. In seconds you get a PDF that looks identical but is now fully searchable, selectable, and accessible.