npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details


  • User packages



Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.


Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2021 – Pkg Stats / Ryan Hefner




A responsive image cropping tool for React




React Image Crop

An image cropping tool for React with no dependencies.

React Image Crop on NPM

Demo using class | Demo using hook

ReactCrop Demo

Table of Contents

  1. Features
  2. Installation
  3. Usage
  4. Example
  5. CDN
  6. Props
  7. FAQ
    1. What about showing the crop on the client?
    2. How to correct image EXIF orientation/rotation
    3. How to filter, rotate and annotate
    4. How can I center the crop?
  8. Contributing / Developing


  • Responsive (you can use pixels or percentages).
  • Touch enabled.
  • Free-form or fixed aspect crops.
  • Keyboard support for nudging selection.
  • No dependencies/small footprint (5KB gzip).
  • Min/max crop size.

If React Image Crop doesn't cover your requirements then I advise to take a look at Doka.js. It features cropping, rotating, filtering, annotation, and lots more.

Learn more about Doka.js here


npm i react-image-crop --save


Include the main js module:

import ReactCrop from 'react-image-crop';

Include either dist/ReactCrop.css or ReactCrop.scss.

import 'react-image-crop/dist/ReactCrop.css';
// or scss:
import 'react-image-crop/lib/ReactCrop.scss';


function CropDemo({ src }) {
  const [crop, setCrop] = useState({ aspect: 16 / 9 });
  return <ReactCrop src={src} crop={crop} onChange={newCrop => setCrop(newCrop)} />;

See the sandbox demo for a more complete example.


If you prefer to include ReactCrop globally by marking react-image-crop as external in your application, then include react-image-crop from the following CDN:

<script src=""></script>

Note when importing the script globally using a <script> tag access the component with ReactCrop.Component.


src (required)

<ReactCrop src="path/to/image.jpg" />

You can of course pass a blob url (using URL.createObjectURL() and URL.revokeObjectURL()) or base64 data.

onChange(crop, percentCrop) (required)

A callback which happens for every change of the crop (i.e. many times as you are dragging/resizing). Passes the current crop state object.

Note you must implement this callback and update your crop state, otherwise nothing will change!

onChange = crop => {
  this.setState({ crop });

You can use either crop or percentCrop, the library can handle either interchangeably. Percent crops will be drawn using percentages, not converted to pixels.

crop (required*)

All crop params are initially optional.

* While you can initially omit the crop object, any subsequent change will need to be saved to state in the onChange and passed into the component.

crop: {
  unit: 'px', // default, can be 'px' or '%'
  x: 130,
  y: 50,
  width: 200,
  height: 200

<ReactCrop src="path/to/image.jpg" crop={this.state.crop} />

If you want a fixed aspect you can either omit width and height:

crop: {
  aspect: 16 / 9;

Or specify one or both of the dimensions:

crop: {
  aspect: 16/9,
  width: 50,

If you specify just one of the dimensions, the other will be calculated for you.

crop: {
  unit: '%',
  width: 50,
  height: 50,

unit is optional and defaults to pixels px. It can also be percent %. In the above example we make a crop that is 50% of the rendered image size. Since the values are a percentage of the image, it will only be a square if the image is also a square.

minWidth (optional)

A minimum crop width, in pixels.

minHeight (optional)

A minimum crop height, in pixels.

maxWidth (optional)

A maximum crop width, in pixels.

maxHeight (optional)

A maximum crop height, in pixels.

keepSelection (optional)

If true is passed then selection can't be disabled if the user clicks outside the selection area.

disabled (optional)

If true then the user cannot resize or draw a new crop. A class of ReactCrop--disabled is also added to the container for user styling.

locked (optional)

If true then the user cannot create or resize a crop, but can still drag the existing crop around. A class of ReactCrop--locked is also added to the container for user styling.

className (optional)

A string of classes to add to the main ReactCrop element.

style (optional)

Inline styles object to be passed to the image wrapper element.

imageStyle (optional)

Inline styles object to be passed to the image element.

imageAlt (optional)

Add an alt attribute to the image element.

onComplete(crop, percentCrop) (optional)

A callback which happens after a resize, drag, or nudge. Passes the current crop state object.

percentCrop is the crop as a percentage. A typical use case for it would be to save it so that the user's crop can be restored regardless of the size of the image (for example saving it on desktop, and then using it on a mobile where the image is smaller).

onImageLoaded(image) (optional)

A callback which happens when the image is loaded. Passes the image DOM element.

Useful if you want to set a crop based on the image dimensions when using pixels:

onImageLoaded = image => {
  this.setState({ crop: { width: image.width, height: image.height } });
  return false; // Return false when setting crop state in here.

Note that you must return false in this callback if you are changing the crop object.

onImageError(event) (optional)

This event is called if the image had an error loading.

onDragStart(event) (optional)

A callback which happens when a user starts dragging or resizing. It is convenient to manipulate elements outside this component.

onDragEnd(event) (optional)

A callback which happens when a user releases the cursor or touch after dragging or resizing.

crossorigin (optional)

Allows setting the crossorigin attribute on the image.

renderSelectionAddon(state) (optional)

Render a custom element in crop selection.

renderComponent (optional)

Render a custom HTML element in place of an image. Useful if you want to support videos:

const videoComponent = (
    style={{ display: 'block', maxWidth: '100%' }}
    onLoadStart={e => {
      // You must inform ReactCrop when your media has loaded. Event('medialoaded', { bubbles: true }));
    <source src="sample.mp4" type="video/mp4" />

<ReactCrop onChange={this.onCropChange} renderComponent={videoComponent} />;

ruleOfThirds (optional)

Show rule of thirds lines in the cropped area. Defaults to false.

circularCrop (optional)

Show the crop area as a circle. If your aspect is not 1 (a square) then the circle will be warped into an oval shape. Defaults to false.


What about showing the crop on the client?

I wanted to keep this component focused so I didn't provide this. Normally a cropped image will be rendered and cached by a backend.

However here's a ready to use function that returns a file blob for the cropped part after providing some parameters you already have when using this package:

 * @param {HTMLImageElement} image - Image File Object
 * @param {Object} crop - crop Object
 * @param {String} fileName - Name of the returned file in Promise
function getCroppedImg(image, crop, fileName) {
  const canvas = document.createElement('canvas');
  const scaleX = image.naturalWidth / image.width;
  const scaleY = image.naturalHeight / image.height;
  canvas.width = crop.width;
  canvas.height = crop.height;
  const ctx = canvas.getContext('2d');

    crop.x * scaleX,
    crop.y * scaleY,
    crop.width * scaleX,
    crop.height * scaleY,

  // As Base64 string
  // const base64Image = canvas.toDataURL('image/jpeg');

  // As a blob
  return new Promise((resolve, reject) => {
    canvas.toBlob(blob => { = fileName;
    }, 'image/jpeg', 1);

async test() {
  const croppedImg = await getCroppedImg(image, crop, fileName);

Some things to note:

  1. toDataURL is synchronous and will block the main thread, for large images this could be for as long as a couple of seconds. We are using toDataURL('image/jpeg') otherwise it will default to image/png and the conversion will be significantly slower.

  2. toBlob is both faster and asynchronous, but not supported on old browsers (this is quickly becoming irrelevant).

  3. Another option to make the conversion faster is to scale the image down before converting it.

How to correct image EXIF orientation/rotation

You might find that some images are rotated incorrectly. Unfortunately this is a browser wide issue not related to this library. You need to fix your image before passing it in.

You can use the following library to load images, which will correct the rotation for you:

You can read an issue on this subject here:

If you're looking for a complete out of the box image editor which already handles EXIF rotation then consider using Doka.

This library is deliberately lightweight and minimal for you to build features on top of. If you wish to perform more advanced image editing out of the box then consider using Doka.

Doka Demo

How can I center the crop?

The easiest way is to use the percentage unit:

crop: {
  unit: '%',
  width: 50,
  height: 50,
  x: 25,
  y: 25

Also remember to set your crop using the percentCrop on changes or the crop will go off-center if the container size changes (e.g. browser resize):

onCropChange = (crop, percentCrop) => this.setState({ crop: percentCrop });

If you need more control over the crop you can set it in onImageLoaded. For example to center a percent crop:

const onLoad = useCallback(img => {

  const aspect = 16 / 9;
  const width = img.width / aspect < img.height * aspect ? 100 : ((img.height * aspect) / img.width) * 100;
  const height = img.width / aspect > img.height * aspect ? 100 : (img.width / aspect / img.height) * 100;
  const y = (100 - height) / 2;
  const x = (100 - width) / 2;

    unit: '%',

  return false; // Return false if you set crop state in here.
}, []);

Contributing / Developing

To develop run yarn start, this will recompile your JS and SCSS on changes.

You can test your changes by opening test/index.html in a browser (you don't need to be running a server).