tesseract.js

What is tesseract.js?

tesseract.js is a JavaScript library that provides Optical Character Recognition (OCR) capabilities. It allows you to extract text from images and PDFs directly in the browser or in a Node.js environment.

What are tesseract.js's main functionalities?

Basic OCR

This feature allows you to perform basic OCR on an image file. The code sample demonstrates how to recognize text from an image using the English language.

const Tesseract = require('tesseract.js');

Tesseract.recognize(
  'path/to/image.png',
  'eng',
  {
    logger: m => console.log(m)
  }
).then(({ data: { text } }) => {
  console.log(text);
});

Handling Multiple Languages

This feature allows you to recognize text in multiple languages. The code sample demonstrates how to recognize text from an image using both English and Spanish languages.

const Tesseract = require('tesseract.js');

Tesseract.recognize(
  'path/to/image.png',
  'eng+spa',
  {
    logger: m => console.log(m)
  }
).then(({ data: { text } }) => {
  console.log(text);
});

Progress Reporting

This feature provides real-time progress updates during the OCR process. The code sample demonstrates how to log progress messages to the console.

const Tesseract = require('tesseract.js');

Tesseract.recognize(
  'path/to/image.png',
  'eng',
  {
    logger: m => console.log(m)
  }
).then(({ data: { text } }) => {
  console.log(text);
});

Using Worker for Performance

This feature allows you to use a worker for better performance, especially for large images or multiple OCR tasks. The code sample demonstrates how to create a worker, load the necessary language, perform OCR, and then terminate the worker.

const { createWorker } = require('tesseract.js');

const worker = createWorker({
  logger: m => console.log(m)
});

(async () => {
  await worker.load();
  await worker.loadLanguage('eng');
  await worker.initialize('eng');
  const { data: { text } } = await worker.recognize('path/to/image.png');
  console.log(text);
  await worker.terminate();
})();

Other packages similar to tesseract.js

ocrad.js

ocrad.js is a JavaScript port of the OCRAD OCR library. It is designed to be used in the browser and can recognize text from images. Compared to tesseract.js, ocrad.js is lighter but may not be as accurate or feature-rich.

node-tesseract-ocr

node-tesseract-ocr is a Node.js wrapper for the Tesseract OCR engine. It provides a simpler interface for performing OCR in Node.js environments. While it offers similar functionalities to tesseract.js, it does not support browser usage.

README

tesseract.js