Best way to compress an image Javascript React Web App

Question

I'm looking for the best solution to compress images that's I receive and need to store in my database.

Actually, I convert an image in base64 and then send it to the server.

handleImage = e => {
    e.preventDefault();
    let reader = new FileReader();
    let file = e.target.files[0];

    reader.onloadend = () => {           
        this.setState({
            file: file,
            image: reader.result
        });
    }

    this.setState({ imgchange: true })
}

And then send the current image in state to the server. But with the low quality image it's fine but when I try to upload a medium-high quality I can't save it on the server, I need a method to compress the image.

Have you any idea to achieve this? Can you show me an example?

Answer 1

Best npm package you can use for image compression is browser-image-compression. Tested in React and Redux.

• Install npm install browser-image-compression --save

async await syntax:

import React from "react";
import imageCompression from 'browser-image-compression';
function photoUpload() {
    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);
        }

      }
  return (
    <>
     <div>
     <input type="file" accept="image/*" onChange={event => handleImageUpload(event)}/>
     </div>
    </>
  );
}

export default photoUpload;

For more in details can check on NPM

Answer 2

you can use react-image-file-resizer library to compress image

import Resizer from 'react-image-file-resizer';


Resizer.imageFileResizer(
    file, //is the file of the new image that can now be uploaded...
    maxWidth, // is the maxWidth of the  new image
    maxHeight, // is the maxHeight of the  new image
    compressFormat, // is the compressFormat of the  new image
    quality, // is the quality of the  new image
    rotation, // is the rotatoion of the  new image
    responseUriFunc,  // is the callBack function of the new image URI
    outputType  // is the output type of the new image
    );

For Example:

import React, { Component } from 'react';
import Resizer from 'react-image-file-resizer';

class App extends Component {
    constructor(props) {
        super(props);
        this.fileChangedHandler = this.fileChangedHandler.bind(this);
    }

    fileChangedHandler(event) {
        var fileInput = false
        if(event.target.files[0]) {
            fileInput = true
        }
        if(fileInput) {
            Resizer.imageFileResizer(
                event.target.files[0],
                300,
                300,
                'JPEG',
                100,
                0,
                uri => {
                    console.log(uri)
                },
                'base64'
            );
        }
    }

    render() {
        return (
            <div className="App">
                <input type="file" onChange={this.fileChangedHandler}/>
            </div>
        );
    }
}

export default App;

For Details you can read this documentation