The Problem with Scanned PDFs
Scanned documents — contracts, receipts, old records, medical files — are just flat photographs wrapped in a PDF container. You cannot highlight text, copy a paragraph, or press Ctrl+F to search for a specific clause. Manually re-typing these documents wastes hours and introduces errors.
How LocalPDF Creates Searchable PDFs
Our tool uses Tesseract.js, an AI-powered Optical Character Recognition engine compiled to WebAssembly, to analyze every pixel of your scanned pages and recognize the text within them. It then creates a "sandwich PDF" — the original scan image on top, with an invisible but selectable text layer underneath.
- In-Browser AI Processing: The entire OCR neural network runs within your web browser. No cloud APIs, no data mining, no third-party servers.
- Multi-Threaded Speed: LocalPDF automatically distributes pages across all available CPU cores for parallel OCR processing, dramatically reducing wait times.
- 50+ Languages: Full support for English, Chinese, Hindi, Arabic, Japanese, Korean, and dozens more — all processed locally.
- Quality Control: Choose between Standard (faster, smaller file) and High Quality (sharper text recognition) modes depending on your needs.
How to Create a Searchable PDF
- Upload your scanned, image-only PDF into the dropzone above.
- Select your document language and preferred quality setting.
- Optionally select specific pages to process if you don't need the entire document.
- Click "Make Searchable" and wait while the OCR engine processes your pages in parallel.
- Download your new searchable PDF. Open it in any PDF viewer and try Ctrl+F — your scanned text is now fully searchable!