Scanned paper documents or screenshots converted to PDF are saved as images, meaning you cannot highlight, search, or copy text from them. Optical Character Recognition (OCR) converts these images into searchable text characters, but doing this securely is vital.
The Security Risk of Online OCR Sites
Scanned documents often contain sensitive personal information, such as medical details, invoices, or bank records. Standard online OCR platforms upload your pages to cloud servers for processing, leaving your files vulnerable to storage leaks or AI training scrape logs.
On-Device OCR: The Private Alternative
Tesseract.js and browser WebAssembly run character recognition directly on your computer's GPU/CPU. When you use a client-side OCR tool like PDF Miracle, your pages are parsed locally, ensuring zero data transmission.
How to extract text privately:
- Select your file in the OCR PDF tool.
- The browser loads the recognition engine locally.
- The engine scans the document characters on-screen.
- Copy the extracted text or save it directly.