Browser Image Compression

Javascript module to be run in the web browser for image compression.

Features

You can use this module to compress jpeg and png image by reducing resolution or storage size before uploading to application server to save bandwidth.
Multi-thread (web worker) non-blocking compression are supported through options.

Install

You can download imageCompression from the dist folder. Alternatively, you can install it via yarn or npm

npm install browser-image-compression --save
or
yarn add browser-image-compression

or use a CDN like delivrjs:

https://cdn.jsdelivr.net/npm/browser-image-compression@1.0.13/dist/browser-image-compression.js
or
https://cdn.jsdelivr.net/npm/browser-image-compression@latest/dist/browser-image-compression.js

How to use this module in your project?

Use as ES module

(can be used in framework like React, Angular, Vue etc)

(work with bundler like webpack and rollup)

import imageCompression from 'browser-image-compression';

or

In html file

<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/browser-image-compression@1.0.13/dist/browser-image-compression.js"></script>

API

Main function

// you should provide one of maxSizeMB, maxWidthOrHeight in the options
const options = { 
  maxSizeMB: number,          // (default: Number.POSITIVE_INFINITY)
  maxWidthOrHeight: number,   // compressedFile will scale down by ratio to a point that width or height is smaller than maxWidthOrHeight (default: undefined)
  onProgress: Function,       // optional, a function takes one progress argument (percentage from 0 to 100) 
  useWebWorker: boolean,      // optional, use multi-thread web worker, fallback to run in main-thread (default: true)

  // following options are for advanced user
  maxIteration: number,       // optional, max number of iteration to compress the image (default: 10)
  exifOrientation: number,    // optional, see https://stackoverflow.com/a/32490603/10395024
  fileType: string,           // optional, fileType override
  initialQuality: number      // optional, initial quality value between 0 and 1 (default: 1)
}

imageCompression(file: File, options): Promise<File | Blob>

Helper function

for advanced user only, most user won't need to use the helper functions

imageCompression.getDataUrlFromFile(file: File | Blob): Promise<base64 encoded string>
imageCompression.getFilefromDataUrl(dataUrl: string, filename: string, lastModified?: number): Promise<File>
imageCompression.loadImage(url: string): Promise<HTMLImageElement>
imageCompression.drawImageInCanvas(img: HTMLImageElement): HTMLCanvasElement | OffscreenCanvas
imageCompression.drawFileInCanvas(file: File| Blob): Promise<[ImageBitmap | HTMLImageElement, HTMLCanvasElement | OffscreenCanvas]>
imageCompression.canvasToFile(canvas: HTMLCanvasElement | OffscreenCanvas, fileType: string, fileName: string, fileLastModified: number, quality?: number): Promise<File | Blob>
imageCompression.getExifOrientation(file: File| Blob): Promise<number> // based on https://stackoverflow.com/a/32490603/10395024

Usage

<input type="file" accept="image/*" onchange="handleImageUpload(event);">

async await syntax:

async function handleImageUpload(event) {

  const imageFile = event.target.files[0];
  console.log('originalFile instanceof Blob', imageFile instanceof Blob); // true
  console.log(`originalFile size ${imageFile.size / 1024 / 1024} MB`);

  const options = {
    maxSizeMB: 1,
    maxWidthOrHeight: 1920,
    useWebWorker: true
  }
  try {
    const compressedFile = await imageCompression(imageFile, options);
    console.log('compressedFile instanceof Blob', compressedFile instanceof Blob); // true
    console.log(`compressedFile size ${compressedFile.size / 1024 / 1024} MB`); // smaller than maxSizeMB

    await uploadToServer(compressedFile); // write your own logic
  } catch (error) {
    console.log(error);
  }

}

Promise.then().catch() syntax:

function handleImageUpload(event) {

  var imageFile = event.target.files[0];
  console.log('originalFile instanceof Blob', imageFile instanceof Blob); // true
  console.log(`originalFile size ${imageFile.size / 1024 / 1024} MB`);

  var options = {
    maxSizeMB: 1,
    maxWidthOrHeight: 1920,
    useWebWorker: true
  }
  imageCompression(imageFile, options)
    .then(function (compressedFile) {
      console.log('compressedFile instanceof Blob', compressedFile instanceof Blob); // true
      console.log(`compressedFile size ${compressedFile.size / 1024 / 1024} MB`); // smaller than maxSizeMB

      return uploadToServer(compressedFile); // write your own logic
    })
    .catch(function (error) {
      console.log(error.message);
    });
}

Demo / Example

open https://donaldcwl.github.io/browser-image-compression/example/basic.html

or check the "example" folder in this repo

Browsers support

IE / Edge	Firefox	Chrome	Safari	Opera	Chrome for Android
IE10, IE11, Edge	last 2 versions	last 2 versions	last 2 versions	last 2 versions	last 2 versions

IE support

Promise API is being used in this library. If you need to support browser that do not support Promise like IE. You can include the Promise polyfill in your project.

See: https://github.com/taylorhakes/promise-polyfill

You can include the following script to load the Promise polyfill:

<script src="https://cdn.jsdelivr.net/npm/promise-polyfill@8/dist/polyfill.min.js"></script>

Typescript type definitions

npm install --save-dev @types/browser-image-compression
or
yarn add --dev @types/browser-image-compression

Contribution

fork the repo and git clone it
run npm run watch # it will watch code change in lib/ folder and generate js in dist/ folder
add/update code in lib/ folder
try the code by opening example/development.html which will load the js in dist/ folder
add/update test in test/ folder
npm run test
push to your forked repo on github
make a pull request to this repo

License

hamcher/browser-image-compression

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