Turn Scanned Image PDFs into Searchable, Copyable Documents
When you scan paperwork, contracts, receipts, or old textbooks, they are often saved as “flat” images inside a PDF container. You cannot select sentences, copy quotes, or press Ctrl+F to search for key dates or amounts.
Commercial PDF editors lock Optical Character Recognition (OCR) behind expensive $15–$30/month subscriptions and demand that you upload sensitive documents to their cloud infrastructure.
AirPDF provides a 100% free, private In-Browser OCR Engine. Everything processes locally on your machine, enabling you to transform flat image PDFs into searchable, selectable documents instantly.
How Our Invisible Text Layer Works
To create a Searchable PDF without altering your original visual scan, AirPDF employs the standard PDF invisible text rendering mode (3 Tr):
- High-DPI Page Rendering: The engine rasterizes each page to an in-memory canvas to analyze character geometry.
- Character & Word Recognition: Words, numbers, and layout coordinates are recognized with precise bounding boxes.
- Invisible Text Overlay: An invisible text layer is injected directly onto the PDF page at matching pixel coordinates.
- Natural Selection & Search: When opened in any PDF reader, you see your original crisp scanned image, but you can effortlessly highlight text with your cursor, search for keywords, and copy paragraphs into word processors.
100% Data Confidentiality
Your confidential agreements, identity documents, and financial statements are never transmitted over the internet. Processing runs entirely in your local browser sandbox with zero cloud tracking.