Client-side tool to check and fix PDF accessibility. Analyze PDFs for text layer accessibility, detect image-only pages, and rebuild selectable text layers with browser-based OCR—no server or backend required. Perfect for privacy-first and legacy environments.
- Convert scanned PDFs to accessible PDFs with selectable, searchable text
- Runs entirely in the browser (no server, no backend, no installation required)
- Privacy-first: Your files never leave your computer
- Multi-page PDF support
- Fast preview and progress bar for multi-file processing
- Download corrected PDFs with OCR text layer
- Pagination and batch processing
- Modern, responsive UI with light/dark mode
- Upload your scanned PDF(s) via the browser interface.
- The tool renders each PDF page as an image in the browser.
- Tesseract.js performs OCR on each page, recognizing text and extracting bounding box data for each word or line.
- pdf-lib reconstructs a new PDF by overlaying an invisible, selectable text layer that closely matches the original layout.
- Download the corrected, accessible PDF.
- No backend or server needed: Everything runs in your browser. Perfect for privacy-conscious workflows or environments where installation of new software is not possible.
- No dependencies beyond your browser: Works on Windows, Mac, Linux, ChromeOS — anywhere with a modern browser.
- Efficient layout mapping: By using Tesseract’s bounding box data, the selectable text is placed as close as possible to its original location, making the document highly usable and accessible.
- Accessibility compliance: Make legacy/scanned PDFs accessible for screen readers.
- Searchable archives: Enable text search in your PDF documents.
- Privacy: Sensitive documents remain on your device.
- No software installation: Ideal for users with restricted environments (e.g., corporate/government computers).
- All processing is done locally in your browser.
- No file is sent to any server.
- No data is stored except for temporary in-memory use during the browser session.
- Download or clone this repository
- Open
index.htmlin your browser (no build step required) - Upload your PDF files and process them!
Note: For best performance, use a modern browser (Chrome, Firefox, Edge, Safari).
- The output text layer aims to match the original as closely as possible, but may not be pixel-perfect due to:
- Variations in OCR accuracy
- Differences in font detection (fonts are approximated, not extracted)
- Word/line bounding boxes
- Large PDFs or images may process slowly depending on your device's capabilities.
- This tool is not a replacement for professional OCR tools like ocrmypdf, but provides an excellent privacy-focused alternative.
MIT License. See LICENSE for details.
- Tesseract.js
- pdf-lib
- PDF.js
- Inspired by the need for privacy-first, accessible PDF processing in restricted environments.