Offline OCR for Confidential & Sensitive Documents
PDF Vault performs optical character recognition entirely in your browser using local WebAssembly, turning confidential scanned documents into searchable PDFs without cloud OCR APIs.
Scanned contracts, NDA drafts, patent applications, and proprietary formulas often arrive as image-only PDFs that need to be made searchable and copyable.
Most free OCR tools send your document images to cloud computer vision APIs (Google Cloud Vision, AWS Textract, or Azure), exposing your company's intellectual property to third-party processors.
PDF Vault executes client-side OCR across 41 languages using WebAssembly. Text recognition happens right on your device, keeping your proprietary records private.
On-Device Neural & Pattern Recognition
Our OCR engine processes image pages through in-browser WebAssembly threads, creating selectable and searchable text layers mapped directly to your scanned pages.
Supports multi-language recognition including English, Spanish, German, French, Chinese, Japanese, and 35 other languages.
- Confidentiality Assured. Trade secrets, financial tables, and legal contracts never leave your screen.
- Searchable PDFs. Adds invisible searchable text beneath your scanned document images.
- Direct Word Export. Extract text directly into editable DOCX files for drafting revisions.
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Frequently asked questions
Is client-side OCR as accurate as cloud OCR?
For standard business scans (300 DPI text, contracts, invoices), client-side Tesseract.js delivers exceptional accuracy comparable to cloud engines without the data privacy exposure.
Does OCR processing require an internet connection?
Once the language training weights are cached in your browser on initial load, OCR executes completely offline without internet.