Step-by-Step Tutorial

How to OCR a PDF to Make Scanned Documents Searchable & Selectable

Scanned documents and photos of receipts are flat image files where text cannot be selected or searched with Ctrl+F. Discover how OCR extracts machine-readable text layers.

Written by Kanishka Giri • Lead Systems & Security Engineer • Updated 2026-10-05

Quick Answer

To OCR a PDF: 1. Open PDFBolt OCR Tool. 2. Upload your scanned document. 3. Click 'Run OCR'. 4. Download a searchable PDF or copy extracted text.

Detailed Step-by-Step Walkthrough

  1. Upload Scanned Document: Select your paper scan, receipt, or invoice photo.
  2. Execute OCR Processing: Neural network filters recognize character curves and alignments.
  3. Download Searchable PDF: Save the dual-layer PDF with selectable and searchable text.

The 3 Stages of Modern Document OCR

1. Image Enhancement: Adaptive Otsu binarization and deskew algorithms clean background shadows.

2. Feature Recognition: Character contours are matched against neural glyph dictionaries.

3. Layer Synthesis: A transparent text layer is precisely aligned above the original scanned image.

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About the Author: Kanishka Giri

Kanishka Giri is a Systems Software & Privacy Engineer specializing in client-side WebAssembly architectures, document forensics, and zero-trust cryptography. He leads technical standards, browser sandbox security, and core PDF processing engines at PDFBolt.

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Frequently Asked Questions

Can I search the OCR output with Ctrl+F?

Yes! The exported PDF contains a native searchable text layer.

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