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Pure Javascript OCR for more than 100 Languages
[](https://github.com/naptha/tesseract.js)
[](https://opencollective.com/tesseractjs) [](https://badge.fury.io/js/tesseract.js)
[](https://github.com/naptha/tesseract.js/graphs/commit-activity)
[](https://opensource.org/licenses/Apache-2.0)
[](https://github.com/airbnb/javascript)
Tesseract.js is a javascript library that gets words in [almost any language](./docs/tesseract_lang_list.md) out of images. ([Demo](http://tesseract.projectnaptha.com/))
Image Recognition
[](http://tesseract.projectnaptha.com)
Video Real-time Recognition
Tesseract.js wraps a [webassembly port](https://github.com/naptha/tesseract.js-core) of the [Tesseract](https://github.com/tesseract-ocr/tesseract) OCR Engine.
It works in the browser using [webpack](https://webpack.js.org/), esm, or plain script tags with a [CDN](#CDN) and on the server with [Node.js](https://nodejs.org/en/).
After you [install it](#installation), using it is as simple as:
```javascript
import { createWorker } from 'tesseract.js';
(async () => {
const worker = await createWorker('eng');
const ret = await worker.recognize('https://tesseract.projectnaptha.com/img/eng_bw.png');
console.log(ret.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 `
```
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**
```shell
# For latest version
npm install tesseract.js
yarn add tesseract.js
# For old versions
npm install tesseract.js@3.0.3
yarn add tesseract.js@3.0.3
```
## Documentation
* [Workers vs. Schedulers](./docs/workers_vs_schedulers.md)
* [Examples](./docs/examples.md)
* [Supported Image Formats](./docs/image-format.md)
* [API](./docs/api.md)
* [Local Installation](./docs/local-installation.md)
* [FAQ](./docs/faq.md)
## Community Projects and Examples
The following are examples and projects built by the community using Tesseract.js. Officially supported examples are found in the [examples](https://github.com/naptha/tesseract.js/tree/master/examples) directory.
- Projects
- Scribe OCR: web application for scanning documents (images and PDFs)
- Site at [scribeocr.com](https://scribeocr.com/), repo at [github.com/scribeocr/scribeocr](https://github.com/scribeocr/scribeocr)
- Chrome Extension (with Manifest V3): https://github.com/Tshetrim/Image-To-Text-OCR-extension-for-ChatGPT
- Examples
- Converting PDF to text: https://github.com/racosa/pdf2text-ocr
- Use `blocks` output to generate granular data [word/symbol level]: https://github.com/Kishlay-notabot/tesseract-bbox-examples
- Electron: https://github.com/Balearica/tesseract.js-electron
- Typescript: https://github.com/Balearica/tesseract.js-typescript
If you have a project or example repo that uses Tesseract.js, feel free to add it to this list using a pull request. Examples submitted should be well documented such that new users can run them; projects should be functional and actively maintained.
## Major changes in v5
Version 5 changes are documented in [this issue](https://github.com/naptha/tesseract.js/issues/820). 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](https://github.com/naptha/tesseract.js/issues/820) for full list
Upgrading from v2 to v5? See [this guide](https://github.com/naptha/tesseract.js/issues/771).
## Major changes in v4
Version 4 includes many new features and bug fixes--see [this issue](https://github.com/naptha/tesseract.js/issues/662) 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](./examples/data)
- 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
## Contributing
### Development
To run a development copy of Tesseract.js do the following:
```shell
# 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/basic-efficient.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.
[](https://gitpod.io/#https://github.com/naptha/tesseract.js/blob/master/examples/browser/basic-efficient.html)
### Building Static Files
To build the compiled static files just execute the following:
```shell
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](https://github.com/naptha/tesseract.js?tab=readme-ov-file#contributing)].
### Financial Contributors
Become a financial contributor and help us sustain our community. [[Contribute](https://opencollective.com/tesseractjs/contribute)]
#### Individuals
#### Organizations
Support this project with your organization. Your logo will show up here with a link to your website. [[Contribute](https://opencollective.com/tesseractjs/contribute)]
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### Financial Contributors
Become a financial contributor and help us sustain our community. [[Contribute](https://opencollective.com/tesseractjs/contribute)]
#### Individuals
#### Organizations
Support this project with your organization. Your logo will show up here with a link to your website. [[Contribute](https://opencollective.com/tesseractjs/contribute)]
