What is the difference between OCR and basic scanning?

Basic scanning creates image files — pictures of pages that you can view but not search. OCR (Optical Character Recognition) adds a searchable text layer so you can find documents by keyword, select and copy text, and search across your entire archive. OCR adds just 1-3p per page and is almost always worth the investment.

Is OCR scanning worth the extra cost?

Almost always yes. OCR adds only 1-3p per page but makes your entire archive searchable by keyword. For any document you might need to find by content rather than file name — which is most business documents — the time saved over the life of the archive far exceeds the modest additional cost.

OCR vs Basic Scanning: What Is the Difference?

Basic scanning creates a picture of your document — an image file that looks exactly like the original page. OCR (Optical Character Recognition) scanning goes further: it reads the text in that image and creates a searchable text layer. The visual result looks the same, but the difference in usability is enormous.

What Basic Scanning Produces

A basic scan converts a paper page into a digital image — typically a PDF or TIFF file. You can view the document on screen, zoom in, print it, and share it. But the computer treats it as a picture, not as text. You cannot search for a word within the document, select and copy text, or perform any text-based operations.

Finding a specific document in an archive of basic scans means either knowing the exact file name or opening files one by one until you find what you are looking for. With 10,000 scanned documents, this is barely more efficient than searching through physical filing cabinets.

What OCR Scanning Produces

OCR scanning creates the same image, but adds an invisible text layer behind it. The document looks identical on screen, but you can now search for any word or phrase within it. You can select text, copy it, and paste it into other documents. Full-text search across your entire archive becomes possible.

A searchable PDF created with OCR allows you to type “Smith” into the search bar and find every document in your archive that mentions Smith — instantly. Without OCR, you would have to remember which file Smith’s documents are in, navigate to that file, and visually scan through pages.

The Cost Difference

OCR adds 1-3p per page to scanning costs. On a project of 50,000 pages, that is £500-£1,500 additional cost. For the ability to search an entire archive by keyword — saving potentially hundreds of hours of manual searching over the life of the archive — this is one of the best-value investments in the scanning process.

OCR Accuracy

Modern OCR software achieves 95-99% accuracy on clean, typed text at 300 DPI. This means that in a typical business letter of 500 words, 5-25 words might be misrecognised. In practice, this does not significantly affect searchability — the vast majority of keywords are captured correctly.

Accuracy drops on: handwritten text (60-80%), poor quality prints, dot-matrix output, carbon copies, very small text (below 8pt), and coloured or patterned backgrounds. For these document types, OCR is still worth applying but should not be relied upon for critical accuracy.

When Basic Scanning Is Enough

Photographs and images with no text content
Documents stored purely for visual reference (architectural drawings, maps)
Archives where you will never need to search by text content
Extremely small projects where the OCR cost exceeds any plausible time saving

For virtually every other scenario — business records, financial documents, correspondence, legal files, HR records — OCR should be standard.

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