ConvertFast Team · 2025-10-16

OCR PDF — Extract Text from Scanned Documents

OCR (Optical Character Recognition) analyzes page images in a scanned PDF and adds machine-readable text. This is useful when search, copy, selection, or downstream conversion does not work on the original scan.

How to use OCR

1. Open OCR PDF.
2. Upload a scanned PDF.
3. Choose language and OCR options if available.
4. Click "Start Conversion" and download the searchable PDF.

Best practices for higher accuracy

• Scan at 300 DPI or higher for printed documents.
• Use correct language selection to improve recognition.
• Pre-process images by deskewing and cropping to remove borders or noise.

Post-processing

• Review extracted text for OCR errors and correct punctuation/linebreaks.
• Convert searchable PDFs to DOCX for editing with PDF to Word.

What affects OCR accuracy?

Recognition depends on scan resolution, contrast, page rotation, language, typeface, and physical damage to the source. Tables, handwriting, multi-column layouts, stamps, and text over images can require manual review. OCR does not guarantee a perfect transcription, so verify names, dates, totals, and other critical values against the page image.

Searchable PDF versus plain text

A searchable PDF keeps the original page image and adds a text layer used by search, selection, and assistive workflows. It is useful when visual fidelity matters. Plain text is easier to reuse but does not preserve page layout. This tool produces a searchable PDF; use PDF to Text when you need a TXT result from a digital PDF.

Verify the recognition result

Search for several words from different pages, copy a paragraph, and compare it with the scan. Pay particular attention to similar characters such as 0 and O, 1 and l, decimal separators, dates, and names. Keep the original scan as the reference source.

Can OCR recognize handwriting?

This workflow is intended primarily for printed text. Handwriting recognition is less predictable and depends heavily on writing style, contrast, and scan quality.

Related tools

• PDF to DOCX — make OCR results editable in Word
• DOC to PDF — create PDFs after post-processing text
• Compress PDF — reduce file sizes after OCR and processing