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Simple Image Compressor

This is a client-side file compression library using web workers.

Greatly inspired by https://github.com/WangYuLue/image-conversion

Installation

NPM

npm i simple-image-compressor

CDN

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/simple-image-compressor-min.js"></script>

Main function

compressImage()

Parameters

  1. file: File
  2. config: { type: 'image/jpeg' | 'image/webp' = 'image/jpeg', quality: number = 0.92 }

Return

Promise<Blob>

Usage

NPM

import { compressImage } from 'simple-image-compressor';

async function compressFile(file) {
  const options = {
    quality: 0.9,
    type: 'image/jpeg',
  };
  const res = await compressImage(file, options);
  return new File([res], 'new filename.jpg', { type: 'image/jpeg' });
}

const file = document.getElementById('file-input')?.files?.[0];

const compressedImage = await compressFile(file);

// upload to server, etc.

CDN

<html lang="en">
  <head>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/simple-image-compressor-min.js"></script>
    <script>
      window.onload = () => {
        const fileInput = document.getElementById('file-input');
        fileInput.addEventListener('change', async () => {
          const file = fileInput.files[0];
          const options = {
            quality: 0.9,
            type: imageCompressor.imageTypes.WEBP,
          };
          const compressedImage = await imageCompressor.compressImage(file, options);
          // do something with the compressed image
        });
      };
    </script>
  </head>

  <body>
    <input
      id="file-input"
      type="file"
    />
  </body>
</html>

Additional Export

import { imageTypes, compressImage } from 'simple-image-compressor';

imageTypes is an object containing the two expected values for config.type:

const imageTypes = {
  WEBP: 'image/webp',
  JPEG: 'image/jpeg',
};

How it works

File -> imageBitMap -> Canvas -> Blob

"ImageBitMap -> Canvas -> Blob" happens in a web worker, allowing for parallel processing.

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