OCR Text Recognition Tool
Free OCR tool to extract text from images and scanned PDFs. Supports multiple languages including English, Chinese, Japanese. Local browser processing for privacy.
How to Use
Select file
Start process
Local processing
Download result
Complete OCR Guide
How OCR Works
OCR (Optical Character Recognition) converts text in images or scanned PDFs into editable, searchable text. Allin PDF offers dual-engine OCR: the local engine is based on Tesseract.js (WebAssembly version running in-browser), supporting 90+ languages, ideal for simple scenarios and privacy-sensitive documents; the cloud engine uses multimodal AI (Gemini/GPT-4o) for superior accuracy on complex layouts, handwriting, and low-quality scans. Recommendation: use local engine for standard printed documents (faster, private); use cloud AI for handwritten content or poor-quality scans. Results export as plain text, searchable PDF (transparent text layer over original images), or formatted Word documents.
Processing Results
Technical Specifications
Feature Comparison
| Feature | Allin PDF | Other Tools |
|---|---|---|
| Privacy | 100% local, no internet needed | Requires cloud upload |
| Languages | 100+ languages | Usually 10-30 |
| Offline Use | Yes (after first load) | No |
Key Facts
OCR text recognition is based on Tesseract.js, running entirely locally in the browser, supporting 100+ languages.
Processing requires no network connection — files and results never leave the device.
Supports mixed-language recognition including Chinese (Simplified/Traditional), English, Japanese, and Korean.
Privacy Protection
WebAssembly local processing means: files never leave your device, no network transfer, no server storage. Basic features work even offline.
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FAQ
What languages does OCR support?
Allin PDF OCR supports multiple languages including English, Chinese (Simplified & Traditional), Japanese, Korean, Spanish, French, German, and more. You can select multiple languages simultaneously for multilingual documents.
Is OCR processing done locally or in the cloud?
Allin PDF uses a dual-engine approach: AI cloud engine (Gemini/GPT-4o/Claude) for highest accuracy, with automatic fallback to local Tesseract.js engine if the cloud is unavailable. The AI engine provides better accuracy especially for handwritten or low-quality scans.
Can OCR recognize text from photos taken with a phone?
Yes. OCR works on both scanned documents and phone camera photos. For best results, ensure good lighting, hold the camera steady, and capture the text at a straight angle. The AI engine handles perspective distortion and varying lighting better than the local engine.
Process Documents Anywhere
Download the Allin PDF app for high-quality offline conversion