PDF OCR Guide: Make Scanned Documents Searchable and Selectable
OCR transforms scanned PDFs into searchable, selectable text. This guide compares Tesseract, Google Cloud Vision, and Adobe Acrobat for accuracy and cost.
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Tags: pdf, developer-tools, conversion, ocr
PDF OCR: Make Scanned Documents Searchable A scanned PDF is a photograph of a document. The text in it is just pixels — no content layer, no searchable characters. OCR (Optical Character Recognition) adds the text layer back, transforming a dead image into a living, searchable, copy-paste-able document. Here's how OCR works, when to use which tool, and how to implement it in code. How OCR Works Modern OCR engines use a multi-stage pipeline: Stage 1: Image Preprocessing Before recognizing characters, the image is cleaned: Deskew: Correct rotation if the page was scanned at an angle Despeckle: Remove noise (random dark pixels from scanner noise) Binarization: Convert grayscale to pure black and white Contrast enhancement: Improve separation between text and background Stage 2: Page…
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