OCR recognizes text
Optical character recognition analyzes page images and returns text plus, in many systems, position information.
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What is OCR and what makes a PDF searchable?
A scanned page is usually just an image. OCR adds machine-readable text so you can search or copy what appears on the page.
Searchable PDF adds a text layer
The original scan can remain visible while an invisible or aligned text layer makes words searchable.
Local vs cloud OCR
Cloud OCR uploads page content to a remote service. On-device OCR keeps recognition within the device privacy boundary.
OCR accuracy depends heavily on the source image
OCR is not a perfect transcription service. Blur, skew, handwriting, unusual fonts, tables, low contrast and mixed languages can reduce accuracy. A cleaner scan usually improves recognition more than repeatedly running OCR on a poor image.
- Use a straight, sharp capture with clear contrast.
- Check important names, amounts and reference numbers manually.
- Treat OCR text as a search aid unless you have verified the content.
Searchable does not mean the page image has changed
A searchable PDF can keep the original scanned image visible while adding a text layer that software can index. This lets the document look like the original scan while still supporting search and text selection when the OCR layer is accurate.
- Visual appearance and OCR text are separate layers in many searchable PDFs.
- Search for a known phrase to confirm that recognition worked.
- For sensitive documents, ask where OCR runs before choosing a workflow.
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