Cropper.js
JavaScript image cropper. This is the branch for v1.x, for v2.x, check out the v2 branch.
Table of contents
Features
- Supports 39 options
- Supports 27 methods
- Supports 6 events
- Supports touch (mobile)
- Supports zooming
- Supports rotating
- Supports scaling (flipping)
- Supports multiple croppers
- Supports cropping on a canvas
- Supports cropping an image on the browser-side by canvas
- Supports translating Exif Orientation information
- Cross-browser support
Main files
dist/
├── cropper.css
├── cropper.min.css (compressed)
├── cropper.js (UMD)
├── cropper.min.js (UMD, compressed)
├── cropper.common.js (CommonJS, default)
└── cropper.esm.js (ES Module)
Getting started
Installation
npm install cropperjs
In browser:
<link href="/path/to/cropper.css" rel="stylesheet">
<script src="/path/to/cropper.js"></script>
cdnjs provides CDN support for Cropper.js's CSS and JavaScript. You can find the links here.
Usage
Syntax
new Cropper(element[, options])
-
element
- Type:
HTMLImageElement or HTMLCanvasElement
- The target image or canvas element for cropping.
-
options (optional)
- Type:
Object
- The options for cropping. Check out the available options.
Example
<!-- Wrap the image or canvas element with a block element (container) -->
<div>
<img id="image" src="picture.jpg">
</div>
/* Make sure the size of the image fits perfectly into the container */
img {
display: block;
/* This rule is very important, please don't ignore this */
max-width: 100%;
}
// import 'cropperjs/dist/cropper.css';
import Cropper from 'cropperjs';
const image = document.getElementById('image');
const cropper = new Cropper(image, {
aspectRatio: 16 / 9,
crop(event) {
console.log(event.detail.x);
console.log(event.detail.y);
console.log(event.detail.width);
console.log(event.detail.height);
console.log(event.detail.rotate);
console.log(event.detail.scaleX);
console.log(event.detail.scaleY);
},
});
FAQ
How to crop a new area after zooming in or zooming out?
Just double-click your mouse to enter crop mode.
How to move the image after cropping an area?
Just double-click your mouse to enter move mode.
How to fix the aspect ratio in free ratio mode?
Just hold the Shift key when you resize the crop box.
How to crop a square area in free ratio mode?
Just hold the Shift key when you crop on the image.
Notes
-
The size of the cropper inherits from the size of the image's parent element (wrapper), so be sure to wrap the image with a visible block element.
If you are using cropper in a modal, you should initialize the cropper after the modal is shown completely. Otherwise, you will not get the correct cropper.
-
The outputted cropped data is based on the original image size, so you can use them to crop the image directly.
-
If you try to start cropper on a cross-origin image, please make sure that your browser supports HTML5 CORS settings attributes, and your image server supports the Access-Control-Allow-Origin option (see the HTTP access control (CORS)).
Known issues
-
Known iOS resource limits: As iOS devices limit memory, the browser may crash when you are cropping a large image (iPhone camera resolution). To avoid this, you may resize the image first (preferably below 1024 pixels) before starting a cropper.
-
Known image size increase: When exporting the cropped image on the browser side with the HTMLCanvasElement.toDataURL method, the size of the exported image may be greater than the original image's. This is because the type of the exported image is not the same as the original image. So just pass the original image's type as the first parameter to toDataURL to fix this. For example, if the original type is JPEG, then use cropper.getCroppedCanvas().toDataURL('image/jpeg') to export image.
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Options
You may set cropper options with new Cropper(image, options).
If you want to change the global default options, You may use Cropper.setDefaults(options).
viewMode
- Type:
Number
- Default:
0
- Options:
0: no restrictions1: restrict the crop box not to exceed the size of the canvas.2: restrict the minimum canvas size to fit within the container. If the proportions of the canvas and the container differ, the minimum canvas will be surrounded by extra space in one of the dimensions.3: restrict the minimum canvas size to fill fit the container. If the proportions of the canvas and the container are different, the container will not be able to fit the whole canvas in one of the dimensions.
Define the view mode of the cropper. If you set viewMode to 0, the crop box can extend outside the canvas, while a value of 1, 2, or 3 will restrict the crop box to the size of the canvas. viewMode of 2 or 3 will additionally restrict the canvas to the container. There is no difference between 2 and 3 when the proportions of the canvas and the container are the same.
dragMode
- Type:
String
- Default:
'crop'
- Options:
'crop': create a new crop box'move': move the canvas'none': do nothing
Define the dragging mode of the cropper.
initialAspectRatio
- Type:
Number
- Default:
NaN
Define the initial aspect ratio of the crop box. By default, it is the same as the aspect ratio of the canvas (image wrapper).
Only available when the aspectRatio option is set to NaN.
aspectRatio
- Type:
Number
- Default:
NaN
Define the fixed aspect ratio of the crop box. By default, the crop box has a free ratio.
data
- Type:
Object
- Default:
null
The previous cropped data you stored will be passed to the setData method automatically when initialized.
Only available when the autoCrop option had set to the true.
preview
- Type:
Element, Array (elements), NodeList or String (selector)
- Default:
''
- An element or an array of elements or a node list object or a valid selector for Document.querySelectorAll
Add extra elements (containers) for preview.
Notes:
- The maximum width is the initial width of the preview container.
- The maximum height is the initial height of the preview container.
- If you set an
aspectRatio option, be sure to set the same aspect ratio to the preview container.
- If the preview does not display correctly, set the
overflow: hidden style to the preview container.
responsive
- Type:
Boolean
- Default:
true
Re-render the cropper when resizing the window.
restore
- Type:
Boolean
- Default:
true
Restore the cropped area after resizing the window.
checkCrossOrigin
- Type:
Boolean
- Default:
true
Check if the current image is a cross-origin image.
If so, a crossOrigin attribute will be added to the cloned image element, and a timestamp parameter will be added to the src attribute to reload the source image to avoid browser cache error.
Adding a crossOrigin attribute to the image element will stop adding a timestamp to the image URL and stop reloading the image. But the request (XMLHttpRequest) to read the image data for orientation checking will require a timestamp to bust the cache to avoid browser cache error. You can set the checkOrientation option to false to cancel this request.
If the value of the image's crossOrigin attribute is "use-credentials", then the withCredentials attribute will set to true when read the image data by XMLHttpRequest.
checkOrientation
- Type:
Boolean
- Default:
true
Check the current image's Exif Orientation information. Note that only a JPEG image may contain Exif Orientation information.
Exactly, read the Orientation value for rotating or flipping the image, and then override the Orientation value with 1 (the default value) to avoid some issues (1, 2) on iOS devices.
Requires to set both the rotatable and scalable options to true at the same time.
Note: Do not trust this all the time as some JPG images may have incorrect (non-standard) Orientation values
Requires Typed Arrays support (IE 10+).
modal
- Type:
Boolean
- Default:
true
Show the black modal above the image and under the crop box.
guides
- Type:
Boolean
- Default:
true
Show the dashed lines above the crop box.
center
- Type:
Boolean
- Default:
true
Show the center indicator above the crop box.
highlight
- Type:
Boolean
- Default:
true
Show the white modal above the crop box (highlight the crop box).
background
- Type:
Boolean
- Default:
true
Show the grid background of the container.
autoCrop
- Type:
Boolean
- Default:
true
Enable to crop the image automatically when initialized.
autoCropArea
- Type:
Number
- Default:
0.8 (80% of the image)
It should be a number between 0 and 1. Define the automatic cropping area size (percentage).
movable
- Type:
Boolean
- Default:
true
Enable to move the image.
rotatable
- Type:
Boolean
- Default:
true
Enable to rotate the image.
scalable
- Type:
Boolean
- Default:
true
Enable to scale the image.
zoomable
- Type:
Boolean
- Default:
true
Enable to zoom the image.
zoomOnTouch
- Type:
Boolean
- Default:
true
Enable to zoom the image by dragging touch.
zoomOnWheel
- Type:
Boolean
- Default:
true
Enable to zoom the image by mouse wheeling.
wheelZoomRatio
- Type:
Number
- Default:
0.1
Define zoom ratio when zooming the image by mouse wheeling.
cropBoxMovable
- Type:
Boolean
- Default:
true
Enable to move the crop box by dragging.
cropBoxResizable
- Type:
Boolean
- Default:
true
Enable to resize the crop box by dragging.
toggleDragModeOnDblclick
- Type:
Boolean
- Default:
true
Enable to toggle drag mode between "crop" and "move" when clicking twice on the cropper.
Requires dblclick event support.
minContainerWidth
- Type:
Number
- Default:
200
The minimum width of the container.
minContainerHeight
- Type:
Number
- Default:
100
The minimum height of the container.
minCanvasWidth
The minimum width of the canvas (image wrapper).
minCanvasHeight
The minimum height of the canvas (image wrapper).
minCropBoxWidth
The minimum width of the crop box.
Note: This size is relative to the page, not the image.
minCropBoxHeight
The minimum height of the crop box.
Note: This size is relative to the page, not the image.
ready
- Type:
Function
- Default:
null
A shortcut to the ready event.
cropstart
- Type:
Function
- Default:
null
A shortcut to the cropstart event.
cropmove
- Type:
Function
- Default:
null
A shortcut to the cropmove event.
cropend
- Type:
Function
- Default:
null
A shortcut to the cropend event.
crop
- Type:
Function
- Default:
null
A shortcut to the crop event.
zoom
- Type:
Function
- Default:
null
A shortcut to the zoom event.
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Methods
As there is an asynchronous process when loading the image, you should call most of the methods after ready, except setAspectRatio, replace and destroy.
If a method doesn't need to return any value, it will return the cropper instance (this) for chain composition.
new Cropper(image, {
ready() {
// this.cropper[method](argument1, , argument2, ..., argumentN);
this.cropper.move(1, -1);
// Allows chain composition
this.cropper.move(1, -1).rotate(45).scale(1, -1);
},
});
crop()
Show the crop box manually.
new Cropper(image, {
autoCrop: false,
ready() {
// Do something here
// ...
// And then
this.cropper.crop();
},
});
reset()
Reset the image and crop box to its initial states.
clear()
Clear the crop box.
replace(url[, hasSameSize])
-
url:
- Type:
String
- A new image url.
-
hasSameSize (optional):
- Type:
Boolean
- Default:
false
- If the new image has the same size as the old one, then it will not rebuild the cropper and only update the URLs of all related images. This can be used for applying filters.
Replace the image's src and rebuild the cropper.
enable()
Enable (unfreeze) the cropper.
disable()
Disable (freeze) the cropper.
destroy()
Destroy the cropper and remove the instance from the image.
move(offsetX[, offsetY])
-
offsetX:
- Type:
Number
- Moving size (px) in the horizontal direction.
-
offsetY (optional):
- Type:
Number
- Moving size (px) in the vertical direction.
- If not present, its default value is
offsetX.
Move the canvas (image wrapper) with relative offsets.
cropper.move(1);
cropper.move(1, 0);
cropper.move(0, -1);
moveTo(x[, y])
-
x:
- Type:
Number
- The
left value of the canvas
-
y (optional):
- Type:
Number
- The
top value of the canvas
- If not present, its default value is
x.
Move the canvas (image wrapper) to an absolute point.
zoom(ratio)
- ratio:
- Type:
Number
- Zoom in: requires a positive number (ratio > 0)
- Zoom out: requires a negative number (ratio < 0)
Zoom the canvas (image wrapper) with a relative ratio.
cropper.zoom(0.1);
cropper.zoom(-0.1);
zoomTo(ratio[, pivot])
-
ratio:
- Type:
Number
- Requires a positive number (ratio > 0)
-
pivot (optional):
- Type:
Object
- Schema:
{ x: Number, y: Number }
- The coordinate of the center point for zooming, base on the top left corner of the cropper container.
Zoom the canvas (image wrapper) to an absolute ratio.
cropper.zoomTo(1); // 1:1 (canvasData.width === canvasData.naturalWidth)
const containerData = cropper.getContainerData();
// Zoom to 50% from the center of the container.
cropper.zoomTo(.5, {
x: containerData.width / 2,
y: containerData.height / 2,
});
rotate(degree)
- degree:
- Type:
Number
- Rotate right: requires a positive number (degree > 0)
- Rotate left: requires a negative number (degree < 0)
Rotate the image to a relative degree.
Requires CSS3 2D Transforms support (IE 9+).
cropper.rotate(90);
cropper.rotate(-90);
rotateTo(degree)
Rotate the image to an absolute degree.
scale(scaleX[, scaleY])
-
scaleX:
- Type:
Number
- Default:
1
- The scaling factor applies to the abscissa of the image.
- When equal to
1 it does nothing.
-
scaleY (optional):
- Type:
Number
- The scaling factor to apply on the ordinate of the image.
- If not present, its default value is
scaleX.
Scale the image.
Requires CSS3 2D Transforms support (IE 9+).
cropper.scale(-1); // Flip both horizontal and vertical
cropper.scale(-1, 1); // Flip horizontal
cropper.scale(1, -1); // Flip vertical
scaleX(scaleX)
- scaleX:
- Type:
Number
- Default:
1
- The scaling factor applies to the abscissa of the image.
- When equal to
1 it does nothing.
Scale the abscissa of the image.
scaleY(scaleY)
- scaleY:
- Type:
Number
- Default:
1
- The scaling factor to apply on the ordinate of the image.
- When equal to
1 it does nothing.
Scale the ordinate of the image.
getData([rounded])
-
rounded (optional):
- Type:
Boolean
- Default:
false
- Set
true to get rounded values.
-
(return value):
- Type:
Object
- Properties:
x: the offset left of the cropped areay: the offset top of the cropped areawidth: the width of the cropped areaheight: the height of the cropped arearotate: the rotated degrees of the imagescaleX: the scaling factor to apply on the abscissa of the imagescaleY: the scaling factor to apply on the ordinate of the image
Output the final cropped area position and size data (based on the natural size of the original image).
You can send the data to the server-side to crop the image directly:
- Rotate the image with the
rotate property.
- Scale the image with the
scaleX and scaleY properties.
- Crop the image with the
x, y, width, and height properties.
setData(data)
- data:
- Type:
Object
- Properties: See the
getData method.
- You may need to round the data properties before passing them in.
Change the cropped area position and size with new data (based on the original image).
Note: This method only available when the value of the viewMode option is greater than or equal to 1.
getContainerData()
- (return value):
- Type:
Object
- Properties:
width: the current width of the containerheight: the current height of the container
Output the container size data.
getImageData()
- (return value):
- Type:
Object
- Properties:
left: the offset left of the imagetop: the offset top of the imagewidth: the width of the imageheight: the height of the imagenaturalWidth: the natural width of the imagenaturalHeight: the natural height of the imageaspectRatio: the aspect ratio of the imagerotate: the rotated degrees of the image if it is rotatedscaleX: the scaling factor to apply on the abscissa of the image if scaledscaleY: the scaling factor to apply on the ordinate of the image if scaled
Output the image position, size, and other related data.
getCanvasData()
- (return value):
- Type:
Object
- Properties:
left: the offset left of the canvastop: the offset top of the canvaswidth: the width of the canvasheight: the height of the canvasnaturalWidth: the natural width of the canvas (read only)naturalHeight: the natural height of the canvas (read only)
Output the canvas (image wrapper) position and size data.
const imageData = cropper.getImageData();
const canvasData = cropper.getCanvasData();
if (imageData.rotate % 180 === 0) {
console.log(canvasData.naturalWidth === imageData.naturalWidth);
// > true
}
setCanvasData(data)
- data:
- Type:
Object
- Properties:
left: the new offset left of the canvastop: the new offset top of the canvaswidth: the new width of the canvasheight: the new height of the canvas
Change the canvas (image wrapper) position and size with new data.
getCropBoxData()
- (return value):
- Type:
Object
- Properties:
left: the offset left of the crop boxtop: the offset top of the crop boxwidth: the width of the crop boxheight: the height of the crop box
Output the crop box position and size data.
setCropBoxData(data)
- data:
- Type:
Object
- Properties:
left: the new offset left of the crop boxtop: the new offset top of the crop boxwidth: the new width of the crop boxheight: the new height of the crop box
Change the crop box position and size with new data.
getCroppedCanvas([options])
-
options (optional):
- Type:
Object
- Properties:
width: the destination width of the output canvas.height: the destination height of the output canvas.minWidth: the minimum destination width of the output canvas, the default value is 0.minHeight: the minimum destination height of the output canvas, the default value is 0.maxWidth: the maximum destination width of the output canvas, the default value is Infinity.maxHeight: the maximum destination height of the output canvas, the default value is Infinity.fillColor: a color to fill any alpha values in the output canvas, the default value is the transparent.imageSmoothingEnabled: set to change if images are smoothed (true, default) or not (false).imageSmoothingQuality: set the quality of image smoothing, one of "low" (default), "medium", or "high".rounded: set true to use rounded values (the cropped area position and size data), the default value is false.
-
(return value):
- Type:
HTMLCanvasElement
- A canvas drawn the cropped image.
-
Notes:
- The aspect ratio of the output canvas will be fitted to the aspect ratio of the crop box automatically.
- If you intend to get a JPEG image from the output canvas, you should set the
fillColor option first, if not, the transparent part in the JPEG image will become black by default.
- Uses the Browser's native canvas.toBlob API to do the compression work, which means it is lossy compression. For better image quality, you can upload the original image and the cropped data to a server and do the crop work on the server.
-
Browser support:
Get a canvas drawn from the cropped image (lossy compression). If it is not cropped, then returns a canvas drawn the whole image.
After then, you can display the canvas as an image directly, or use HTMLCanvasElement.toDataURL to get a Data URL, or use HTMLCanvasElement.toBlob to get a blob and upload it to server with FormData if the browser supports these APIs.
Avoid getting a blank (or black) output image, you might need to set the maxWidth and maxHeight properties to limited numbers, because of the size limits of a canvas element. Also, you should limit the maximum zoom ratio (in the zoom event) for the same reason.
cropper.getCroppedCanvas();
cropper.getCroppedCanvas({
width: 160,
height: 90,
});
cropper.getCroppedCanvas({
minWidth: 256,
minHeight: 256,
maxWidth: 4096,
maxHeight: 4096,
});
cropper.getCroppedCanvas({
fillColor: '#fff',
imageSmoothingEnabled: false,
imageSmoothingQuality: 'high',
});
// Upload cropped image to server if the browser supports `HTMLCanvasElement.toBlob`.
// The default value for the second parameter of `toBlob` is 'image/png', change it if necessary.
cropper.getCroppedCanvas().toBlob((blob) => {
const formData = new FormData();
// Pass the image file name as the third parameter if necessary.
formData.append('croppedImage', blob/*, 'example.png' */);
// Use `jQuery.ajax` method for example
$.ajax('/path/to/upload', {
method: 'POST',
data: formData,
processData: false,
contentType: false,
success() {
console.log('Upload success');
},
error() {
console.log('Upload error');
},
});
}/*, 'image/png' */);
setAspectRatio(aspectRatio)
- aspectRatio:
- Type:
Number
- Requires a positive number.
Change the aspect ratio of the crop box.
setDragMode([mode])
- mode (optional):
- Type:
String
- Default:
'none'
- Options:
'none', 'crop', 'move'
Change the drag mode.
Tips: You can toggle the "crop" and "move" mode by double clicking on the cropper.
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Events
ready
This event fires when the target image has been loaded and the cropper instance is ready for operating.
let cropper;
image.addEventListener('ready', function () {
console.log(this.cropper === cropper);
// > true
});
cropper = new Cropper(image);
cropstart
This event fires when the canvas (image wrapper) or the crop box starts to change.
image.addEventListener('cropstart', (event) => {
console.log(event.detail.originalEvent);
console.log(event.detail.action);
});
cropmove
This event fires when the canvas (image wrapper) or the crop box is changing.
cropend
This event fires when the canvas (image wrapper) or the crop box stops changing.
crop
- event.detail.x
- event.detail.y
- event.detail.width
- event.detail.height
- event.detail.rotate
- event.detail.scaleX
- event.detail.scaleY
About these properties, see the getData method.
This event fires when the canvas (image wrapper) or the crop box changes.
Notes:
- When the
autoCrop option is set to the true, a crop event will be triggered before the ready event.
- When the
data option is set, another crop event will be triggered before the ready event.
zoom
This event fires when a cropper instance starts to zoom in or zoom out its canvas (image wrapper).
image.addEventListener('zoom', (event) => {
// Zoom in
if (event.detail.ratio > event.detail.oldRatio) {
event.preventDefault(); // Prevent zoom in
}
// Zoom out
// ...
});
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No conflict
If you have to use another cropper with the same namespace, just call the Cropper.noConflict static method to revert to it.
<script src="other-cropper.js"></script>
<script src="cropper.js"></script>
<script>
Cropper.noConflict();
// Code that uses other `Cropper` can follow here.
</script>
Browser support
- Chrome (latest)
- Firefox (latest)
- Safari (latest)
- Opera (latest)
- Edge (latest)
- Internet Explorer 9+
Contributing
Please read through our contributing guidelines.
Versioning
Maintained under the Semantic Versioning guidelines.
License
MIT © Chen Fengyuan
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