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What to know before OCRing a PDF?

What is PDF OCR?PDF OCR is the process of recognizing text inside a scanned PDF or image-based PDF. A normal scan may look readable to a person, but the computer only sees page images. That is why you cannot search for a name, select a paragraph, copy a sentence, or index the document properly. OCR PDF processing reads the letters on each page and turns them into machine-readable text.

What is PDF OCR?

PDF OCR is the process of recognizing text inside a scanned PDF or image-based PDF. A normal scan may look readable to a person, but the computer only sees page images. That is why you cannot search for a name, select a paragraph, copy a sentence, or index the document properly. OCR PDF processing reads the letters on each page and turns them into machine-readable text.

What does a PDF OCR tool output?

The most useful output for this first version is a searchable PDF. It keeps the original page appearance, but adds recognized text behind the scan so Find, copy, and text selection can work. A second lightweight output is plain text, which is useful when you only need the words from receipts, contracts, notes, forms, book pages, or archived scans.

How to OCR a PDF online?

To OCR a PDF online, start with a clear scanned document, choose the document language, run recognition, review the extracted text, and export the result. If your goal is document search, choose searchable PDF. If your goal is copying content into another app, plain text is usually enough. For best results, use scans that are straight, high contrast, and not blurred.

How to tell if your PDF needs OCR?

The fastest test is to open the PDF and try to select a single word. If dragging over the word selects a rectangular image area instead of text, the file is probably image-only.