Image cropper for Angular

Installation

npm install ngx-image-cropper --save

Upgrade instructions

For a list of breaking changes and update instructions, go to releases.

Example usage

Add the ImageCropperModule to the imports of the module which will be using the Image Cropper.

import { NgModule } from '@angular/core';
import { ImageCropperModule } from 'ngx-image-cropper';

@NgModule({
    imports: [
        ...
        ImageCropperModule
    ],
    declarations: [
        ...
    ],
    exports: [
        ...
    ],
    providers: [
        ...
    ]
})
export class YourModule {
}

Add the element to your HTML:

<input type="file" (change)="fileChangeEvent($event)" />

<image-cropper
    [imageChangedEvent]="imageChangedEvent"
    [maintainAspectRatio]="true"
    [aspectRatio]="4 / 3"
    format="png"
    (imageCropped)="imageCropped($event)"
    (imageLoaded)="imageLoaded()"
    (cropperReady)="cropperReady()"
    (loadImageFailed)="loadImageFailed()"
></image-cropper>

<img [src]="croppedImage" />

And add this to your ts file:

import { ImageCroppedEvent } from 'ngx-image-cropper';

export class YourComponent {
    imageChangedEvent: any = '';
    croppedImage: any = '';

    fileChangeEvent(event: any): void {
        this.imageChangedEvent = event;
    }
    imageCropped(event: ImageCroppedEvent) {
        this.croppedImage = event.base64;
    }
    imageLoaded(image: HTMLImageElement) {
        // show cropper
    }
    cropperReady() {
        // cropper ready
    }
    loadImageFailed() {
        // show message
    }
}

When you choose a file from the file input, it will trigger fileChangeEvent. That event is then passed to the image cropper through imageChangedEvent which will load the image into the cropper. Everytime you release the mouse, the imageCropped event will be triggered with the cropped image as a Base64 string in its payload.

API

All inputs are optional. Either the imageChangedEvent, imageBase64 or imageFile should be set to load an image into the cropper.

Inputs

Name	Type	Default	Description
`imageChangedEvent`	FileEvent		The change event from your file input (set to `null` to reset the cropper)
`imageFile`	Blob(File)		The file you want to change (set to `null` to reset the cropper)
`imageBase64`	string		If you don't want to use a file input, you can set a base64 image directly and it will be loaded into the cropper
`imageURL`	string		If you don't want to use a file input or a base64 you can set an URL to get the image from. If requesting an image from a different domain make sure Cross-Origin Resource Sharing (CORS) is allowed or the image will fail to load.
`format`	string	png	Output format (png, jpeg, webp, bmp, ico) (not all browsers support all types, png is always supported, others are optional)
`aspectRatio`	number	1 / 1	The width / height ratio (e.g. 1 / 1 for a square, 4 / 3, 16 / 9 ...)
`maintainAspectRatio`	boolean	true	Keep width and height of cropped image equal according to the aspectRatio
`containWithinAspectRatio`	boolean	false	When set to true, padding will be added around the image to make it fit to the aspect ratio
`resizeToWidth`	number	0 (disabled)	Cropped image will be resized to at most this width (in px)
`resizeToHeight`	number	0 (disabled)	Cropped image will be resized to at most this height (in px)
`cropperStaticWidth`	number	0 (disabled)	Set Cropper Width and disable resize (in px)
`cropperStaticHeight`	number	0 (disabled)	Set Cropper Height and disable resize (in px)
`cropperMinWidth`	number	0 (disabled)	The cropper cannot be made smaller than this number of pixels in width (relative to original image's size) (in px)
`cropperMinHeight`	number	0 (disabled)	The cropper cannot be made smaller than this number of pixels in height (relative to original image's size) (in px) (will be ignored if `maintainAspectRatio` is set)
`cropperMaxWidth`	number	0 (disabled)	The cropper cannot be made bigger than this number of pixels in width (in px)
`cropperMaxHeight`	number	0 (disabled)	The cropper cannot be made bigger than this number of pixels in height (in px)
`initialStepSize`	number	3 (px)	The initial step size in pixels when moving the cropper using the keyboard. Step size can then be changed by using the numpad when the cropper is focused
`onlyScaleDown`	boolean	false	When the `resizeToWidth` or `resizeToHeight` is set, enabling this option will make sure smaller images are not scaled up
`cropper`	CropperPosition		To be able to overwrite the cropper coordinates, you can use this input. Create a new object of type `CropperPosition` and assign it to this input. Make sure to create a new object each time you wish to overwrite the cropper's position and wait for the `cropperReady` event to have fired.
`roundCropper`	boolean	false	Set this to true for a round cropper. Resulting image will still be square, use `border-radius: 100%` on resulting image to show it as round.
`imageQuality`	number	92	This only applies when using jpeg or webp as output format. Entering a number between 0 and 100 will determine the quality of the output image.
`autoCrop`	boolean	true	When set to true, the cropper will emit an image each time the position or size of the cropper is changed. When set to false, you can call the crop method yourself (use @ViewChild to get access to the croppers methods).
`alignImage`	'left' or 'center'	'center'	Use this to align the image in the cropper either to the left or center.
`backgroundColor`	string		Use this to set a backgroundColor, this is useful if you upload an image of a format with transparent colors and convert it to 'jpeg' or 'bmp'. The transparent pixels will then become the set color or the default value. Enter a color HashCode or one of known HTML color names (https://www.w3schools.com/tags/ref_colornames.asp).
`hideResizeSquares`	boolean	false	Disables the resize-squares at the border of the cropper. This is mostly useful for Touch Devices where you can change the Size of the Cropper via Pinch-To-Zoom
`disabled`	boolean	false	Disables the component and prevents changing the cropper position
`canvasRotation`	number	0	Rotate the canvas (1 = 90deg, 2 = 180deg...)
`transform`	ImageTransform	{}	Flip, rotate and scale image

CSS Variables

Name	Type	Default	Description
`--cropper-outline-color`	string	rgba(255,255,255,0.3)	The background color you see around the cropper
`--cropper-overlay-color`	string	rgba(255,255,255)	The background color you see around the image

Outputs

Name	Type	Description
`imageCropped`	ImageCroppedEvent	Emits an ImageCroppedEvent each time the image is cropped
`imageLoaded`	LoadedImage	Emits the Image when it was loaded into the cropper
`cropperReady`	Dimensions	Emits when the cropper is ready to be interacted. The Dimensions object that is returned contains the displayed image size
`startCropImage`	void	Emits when the component started cropping the image
`loadImageFailed`	void	Emits when a wrong file type was selected (only png, gif and jpg are allowed)

Methods

To gain access to the image cropper's methods use @ViewChild(ImageCropperComponent) imageCropper: ImageCropperComponent;

Name	Returns	Description
`crop`	ImageCroppedEvent	Crops the source image to the current cropper position. Be sure to set `autoCrop` to `false` if you only wish to use this function directly.

Interfaces

CropperPosition

Property	Type	Description
x1	number	X position of first coordinate (in px)
y1	number	Y position of first coordinate (in px)
x2	number	X position of second coordinate (in px)
y2	number	Y position of second coordinate (in px)

ImageTransform

Property	Type	Description
scale	number	Scale image (1=normal, 2=2x zoom...)
rotate	number	Rotation in degrees
flipH	boolean	Flipped horizontally
flipV	boolean	Flipped vertically

ImageCroppedEvent

Property	Type	Description
base64	string	Base64 string of the cropped image
width	number	Width of the cropped image
height	number	Height of the cropped image
cropperPosition	CropperPosition	Position of the cropper when it was cropped relative to the displayed image size
imagePosition	CropperPosition	Position of the cropper when it was cropped relative to the original image size
offsetImagePosition	CropperPosition	Position of the cropper when it was cropped relative to the original image size without padding when containWithinAspectRatio is true

ImageLoaded

Property	Type	Description
original.base64	string	Base64 string of the original image
original.image	HTMLImageElement	HTMLImageElement of the original image
original.size	Dimension	Width and height of the original image
transformed.base64	string	Base64 string of the transformed image
transformed.image	HTMLImageElement	HTMLImageElement of the transformed image
transformed.size	Dimension	Width and height of the transformed image
exifTransform	ExifTransform	Exif transformations read from original image

Feng-JY/ngx-image-cropper