Free Online OCR — Extract Text from Images with 100% Client-Side Privacy
Convert images, screenshots, scanned receipts, and PDFs into editable text directly in your browser using high-performance WebAssembly (WASM) and Tesseract.js. Unlike traditional online OCR services that upload your confidential documents to third-party cloud servers, EasyDev executes all character recognition algorithms 100% locally on your machine. Your private invoices, contracts, personal photos, and sensitive credentials never leave your browser sandbox, guaranteeing complete zero-knowledge security, SOC 2 / HIPAA compliance, and zero server latency.
Features
100% Client-Side WebAssembly
Powered by Tesseract.js compiled to WebAssembly (WASM) and executed inside isolated Web Workers. Zero bytes of image data are sent across the network.
Multi-Language Character Recognition
Full optical recognition support for Vietnamese with complex tone marks (vie), English (eng), Japanese (jpn), Simplified/Traditional Chinese (chi_sim / chi_tra), Korean (kor), French, German, Spanish, and more.
HTML5 Canvas Preprocessing
Built-in contrast optimization, grayscale normalization, and threshold binarization algorithms enhance text clarity and maximize character extraction accuracy.
Instant 1-Click Workflow
Drop image files, paste directly from your clipboard (Ctrl + V), inspect live recognition progress with percentage bars, and export results directly to .txt or clipboard.
How to Extract Text from Images Online
A simple step-by-step guide to recognizing text from images with zero server uploads.
- Upload or Paste ImageDrag and drop your image (PNG, JPG, WebP) into the dropzone or press Ctrl+V to paste a screenshot directly from your clipboard.
- Select Document LanguageChoose the primary language of the text in your image (e.g., Tiếng Việt, English, Japanese, Chinese) for optimal recognition accuracy.
- Fine-tune Preprocessing (Optional)Enable auto-contrast or high-contrast binarization if your image has low lighting, shadows, or faint text.
- Click Extract Text (OCR)Hit the Extract Text button. Watch the live WebAssembly progress bar as Tesseract processes the image locally in your browser.
- Copy or DownloadView extracted text, character count, and confidence score. Click Copy to save to clipboard or Download .txt to save the output file.
Frequently Asked Questions
- Is my uploaded image sent to any remote server?
- No. EasyDev runs 100% client-side via WebAssembly (WASM) in your browser. No image, document, token, or extracted text is ever transmitted over the network or stored on any server.
- Does this OCR tool support Vietnamese tone marks accurately?
- Yes! The tool uses the official Tesseract Vietnamese trained data model (vie) which accurately distinguishes complex diacritics and accented characters like ă, â, đ, ê, ô, ơ, ư.
- Can I paste screenshots directly from my clipboard?
- Yes. Simply take a screenshot on Windows (Win + Shift + S), Mac (Cmd + Shift + 4), or Linux (PrtScn), then focus on this page and press Ctrl + V (or Cmd + V).
- Why is there a short delay on the first recognition run?
- On your first run for a specific language, the browser downloads the WebAssembly worker and language dictionary file once. Subsequent recognition tasks run much faster as files are cached in your browser.
- Can I process receipts and invoices with low lighting?
- Yes. Enable the "Auto-enhance contrast" or "High-contrast Binarize" options on the left configuration panel. This runs real-time pixel contrast normalization on Canvas before feeding the image to the OCR engine.
- Is there a limit on the number of images I can convert?
- No. Since the processing runs entirely on your local hardware without server costs, you can convert unlimited images with zero rate limits and zero registration requirements.