Optical Character Recognition (OCR)
Extract text from images and PDF documents instantly, directly in your browser.
Select Document
PDF, PNG or JPG up to 100MB
Extracted Text
No document selected
No text extracted yet
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How In-Browser Optical Character Recognition (OCR) Works
LensText provides a professional-grade Optical Character Recognition (OCR) tool that empowers you to instantly extract, edit, and export text from scanned images and PDF documents. Unlike traditional cloud-based OCR services that pose massive privacy risks, LensText utilizes advanced WebAssembly (WASM) to run the industry-leading Tesseract OCR engine directly inside your web browser. This means that whether you are digitizing confidential legal contracts, scanning medical records, or archiving old tax returns, your files never leave your computer. We offer unparalleled zero-trust security without sacrificing extraction accuracy or speed. By shifting the computational workload to your local device's CPU, we are able to provide this enterprise-level utility completely free of charge, with no subscriptions, file size limits, or hidden fees.
How to Use
- Select your file: Upload a high-resolution image (PNG, JPG, BMP) or a scanned PDF document using our secure drag-and-drop zone.
- Choose the language: Select the appropriate language(s) from the dropdown menu. Our engine supports over 100 languages. Selecting the correct language pack ensures the highest possible recognition accuracy, especially for documents containing special characters or accents.
- Local Processing: Once you upload the file, our WebAssembly-compiled neural network takes over. Watch the progress bar as your CPU analyzes the visual features of the document and translates them into text.
- Edit and Export: Review the extracted text in our built-in editor. From there, you can make manual corrections, copy the text to your clipboard, or download the final result as a standard .txt file for your archives.
Key Features & Benefits
- Zero Data Uploads: LensText guarantees absolute privacy. Your files are never transmitted over the internet, stored on cloud servers, or used to train external AI models. All operations are confined to your local computer's memory.
- Powered by Tesseract: We utilize a customized WASM port of Tesseract, an open-source OCR engine originally developed by Hewlett-Packard and later maintained by Google. It is widely considered one of the most accurate text recognition engines available.
- Global Language Support: Whether you are scanning a Japanese manga, a French legal brief, or an Arabic manuscript, our tool supports over 100 language models to ensure accurate character mapping globally.
- PDF and Image Compatibility: Our tool seamlessly handles both single-page images and multi-page PDF documents, making it versatile for both personal and professional data extraction needs.
Frequently Asked Questions
How does OCR actually work?
OCR relies on complex computer vision algorithms. Our tool uses Long Short-Term Memory (LSTM) neural networks to analyze the geometric features of the pixels in your image. It identifies lines, curves, and intersections, comparing them against established language models to deduce the most likely character or word.
Why is the text sometimes inaccurate?
OCR accuracy depends heavily on the quality of the source image. Blurry images, low contrast (like dark text on a dark background), handwritten notes, and unusual stylized fonts can confuse the neural network. For the best results, ensure your scans are well-lit, high-resolution, and properly aligned.
Is this tool completely free?
Yes! Because we run the heavy OCR processing on your local device rather than paying for expensive cloud GPU servers, our overhead costs are minimal. We pass these savings directly to you, keeping the tool free forever.
Can I use this on my mobile phone?
Absolutely. LensText is a Progressive Web App (PWA) optimized for mobile browsers. You can take a photo of a document with your smartphone camera and extract the text instantly while on the go.