naptha/tesseract.js

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Tesseract.js is a javascript library that gets words in almost any language out of images. (Demo) Image Recognition Video Real-time Recognition Tesseract.js wraps a webassembly port of the Tesseract OCR Engine. It works in the browser using webpack, esm, or plain script tags with a CDN and on the server with Node.js. After you install it, using it is as simple as: import { createWorker } from 'tesseract.js'; (async () => { const worker = await createWorker('eng'); const data = await worker.recognize('https://tesseract.projectnaptha.com/img/eng_bw.png'); console.log(data.text); await worker.terminate(); })(); When recognizing multiple images, users should create a worker once, run worker.recognize for each image, and then run worker.terminate() once at the end (rather than running the above snippet for every image). Installation Tesseract.js works with a <script> tag via local copy or CDN, with webpack via npm and on Node.js with npm/yarn. CDN <!-- v5 --> <script src='https://cdn.jsdelivr.net/npm/tesseract.js@5/dist/tesseract.min.js'></script> After including the script the Tesseract variable will be globally available and a worker can be created using Tesseract.createWorker. Alternatively, an ESM build (used with import syntax) can be found at https://cdn.jsdelivr.net/npm/tesseract.js@5/dist/tesseract.esm.min.js. Node.js Requires Node.js v14 or higher # For latest version npm install tesseract.js yarn add tesseract.js # For old versions npm install [email protected] yarn add [email protected] Documentation Workers vs. Schedulers Examples Supported Image Formats API Local Installation FAQ Major changes in v5 Version 5 changes are documented in this issue. Highlights are below. Significantly smaller files by default (54% smaller for English, 73% smaller for Chinese) This results in a ~50% reduction in runtime for first-time users (who do not have the files cached yet) Significantly lower memory usage Compatible with iOS 17 (using default settings) Breaking changes: createWorker arguments changed Setting non-default language and OEM now happens in createWorker E.g. createWorker("chi_sim", 1) worker.initialize and worker.loadLanguage functions now do nothing and can be deleted from code See this issue for full list Upgrading from v2 to v5? See this guide. Major changes in v4 Version 4 includes many new features and bug fixes--see this issue for a full list. Several highlights are below. Added rotation preprocessing options (including auto-rotate) for significantly better accuracy Processed images (rotated, grayscale, binary) can now be retrieved Improved support for parallel processing (schedulers) Breaking changes: createWorker is now async getPDF function replaced by pdf recognize option Major changes in v3 Significantly faster performance Runtime reduction of 84% for Browser and 96% for Node.js when recognizing the example images Upgrade to Tesseract v5.1.0 (using emscripten 3.1.18) Added SIMD-enabled build for supported devices Added support: Node.js version 18 Removed support: ASM.js version, any other old versions of Tesseract.js-core (<3.0.0) Node.js versions 10 and 12 Use tesseract.js the way you like! Electron Version: https://github.com/Balearica/tesseract.js-electron Chrome Extension (with Manifest V3): https://github.com/Tshetrim/Image-To-Text-OCR-extension-for-ChatGPT Converting PDF to text: https://github.com/racosa/pdf2text-ocr The following are old examples that use depreciated versions of Tesseract.js. Updating to Tesseract.js v4 is highly recommended. Users are encouraged to create updated examples (or make entirely new ones) and submit them as pull requests. Offline Version: https://github.com/jeromewu/tesseract.js-offline Custom Traineddata: https://github.com/jeromewu/tesseract.js-custom-traineddata Firefox Extension: https://github.com/gnonio/korporize With Vue: https://github.com/jeromewu/tesseract.js-vue-app With Angular: https://github.com/jeromewu/tesseract.js-angular-app With React: https://github.com/jeromewu/tesseract.js-react-app Typescript: https://github.com/jeromewu/tesseract.js-typescript Video Real-time Recognition: https://github.com/jeromewu/tesseract.js-video React Native is not supported as it does not support Webassembly. Contributing Development To run a development copy of Tesseract.js do the following: # First we clone the repository git clone https://github.com/naptha/tesseract.js.git cd tesseract.js # Then we install the dependencies npm install # And finally we start the development server npm start The development server will be available at http://localhost:3000/examples/browser/demo.html in your favorite browser. It will automatically rebuild tesseract.min.js and worker.min.js when you change files in the src folder. Online Setup with a single Click You can use Gitpod(A free online VS Code like IDE) for contributing. With a single click it will launch a ready to code workspace with the build & start scripts already in process and within a few seconds it will spin up the dev server so that you can start contributing straight away without wasting any time. Building Static Files To build the compiled static files just execute the following: npm run build This will output the files into the dist directory. Contributors Code Contributors This project exists thanks to all the people who contribute. [Contribute]. Financial Contributors Become a financial contributor and help us sustain our community. [Contribute] Individuals Organizations Support this project with your organization. Your logo will show up here with a link to your website. [Contribute]