Tesseract WebAssembly OCR

Turn Scanned PDFs into Searchable Documents

Extract text and create searchable PDF layers from scanned receipts, contracts, books, and images using in-browser Optical Character Recognition.

100% In-Browser ExecutionZero Server UploadsNo Account Required
Step-by-step workflow

How to turn scanned pdfs into searchable documents

Follow these simple steps to process your document privately in seconds.

01

Load the Scanned Document

Open the scanned PDF or image in PDF Studio.

02

Execute OCR Recognition

Click OCR in the top toolbar to run the local recognition worker across pages.

03

Copy Text or Save PDF

Copy recognized text directly or export the PDF with embedded searchable text.

Key Capabilities

Why use PDF Studio for this task

In-Browser OCR Engine

Powered by Tesseract.js running in a Web Worker, ensuring high character recognition accuracy without server transmission.

Searchable Text Layer

Generates an invisible selectable text layer aligned over the scanned image, enabling instant Ctrl+F search and text copying.

Side-by-Side Review Panel

Review recognized text lines side-by-side with the original scan to inspect and correct any ambiguous characters.

Multi-Language Support

Supports English and major language datasets for accurate multi-lingual document recognition.

Scan Enhancement Pipeline

Includes image processing tools (contrast, binarization, gamma adjustment) to boost OCR accuracy on faint scans.

Total Confidentiality

Ideal for financial statements, tax filings, and legal records because images never leave your computer.

Verified Privacy & Local Memory Execution

Your PDF is processed directly on your computer using WebAssembly and HTML5 Canvas technology. At no point during viewing, editing, or exporting is your file transmitted to external servers. Review our Security Architecture or read our verified Privacy Policy.

Technical Considerations & Browser Limitations

  • OCR processing is computationally intensive and runs on your device's CPU/WebAssembly runtime. Multi-page scans may take a few seconds per page.
  • Extremely degraded or handwritten cursive documents may have lower recognition accuracy than standard typed text.
Frequently Asked Questions

Common questions about turn scanned pdfs into searchable documents

How does in-browser OCR work?

PDF Studio uses WebAssembly to execute the industry-standard Tesseract OCR engine directly inside your web browser. The image is parsed in local memory without uploading to a cloud server.

Can I search for text inside the exported PDF?

Yes! The exported PDF contains a searchable text layer, meaning you can search with Ctrl+F / Cmd+F and highlight text in standard PDF readers like Adobe Acrobat or Apple Preview.

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