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OCR (Optical Character Recognition) extracts text from scanned PDFs and image-based documents, converting visual representations of text into actual text you can edit, copy, and use in other applications.
This guide covers the complete process of using OCR to get text from your PDFs, from processing documents to extracting and using the recognized text content.
Whether you need to digitize paper archives, extract data from scanned forms, or convert image-based documents to editable text, you will learn effective OCR techniques.
A searchable PDF keeps the original document appearance with an invisible text layer for searching and copying. Extracted text gives you just the recognized words as plain text, losing all formatting and images. Choose searchable PDF to preserve document appearance, or plain text when you need raw content for editing or data processing.
OCR errors occur when characters look similar to others (like 1 and l, 0 and O), when scan quality is poor, when fonts are unusual, or when image contrast is insufficient. Damaged or degraded documents, skewed scans, and non-standard layouts also increase errors. Proofreading is essential for accuracy-critical documents.
Yes, OCR processes all pages but only recognizes and converts text portions. Photos, graphics, and illustrations remain as images. The tool distinguishes between text and non-text content and applies recognition only where appropriate. Complex layouts with text over images may reduce accuracy in those areas.
Some OCR tools support multiple languages simultaneously. Specify all languages present in your document for best results. If your tool supports only one language, process sections separately or use the primary document language, accepting reduced accuracy for sections in other languages.
File size limits depend on the tool used. Browser-based tools may struggle with very large files due to memory constraints. Documents over 100-200 pages may need processing in sections. Consider splitting large PDFs before OCR and merging afterward if you encounter size-related processing failures.
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