We can use it to resize and crop our images by passing an appropriate number of arguments. The drawImage() method of the canvas API will have an important role to play here. Having access to the aspect ratio will allow us to resize the image without stretching it in either direction, so that we can avoid any distortion. This width and height are used to determine the aspect ratio of the image. We will now use an event listener to wait for the image to load and then get its original width and height.
Here is an example: // Referencing an Image loaded in the DOMĬonst originalImage = document.querySelector("img.puppy") You can do that either by referencing an image that has already been loaded in the DOM or by creating a new image using the Image() constructor. The first thing that we need to do is load our image data. One thing that you should keep in mind is that getting access to the image data for manipulating it with a canvas requires you to either have the image on the same server or use the crossorigin attribute to indicate that the canvas has permission to access, modify, and save the image data. We will use the API in this tutorial to create our cropped and resized images. There are hundreds of libraries out there that you can use to create graphs, vectors, and animations using the canvas API. The canvas HTML element has been around for a long time now, and we can use it to draw all sorts of graphics. We can do that with the help of the canvas element. We will need access to the original image data in order to create a new version of the image that is cropped or resized to specific dimensions. Here's a live demo of our image cropping code in action.Īnd here's an example of the resizing code:
In this tutorial, you will learn how to crop or resize an image with JavaScript. We've already published a couple of tutorials on how to create image thumbnails using PHP or apply cropping, resizing and other filters using PHP.
What if you want to create an actual cropped or resized version of an image for your visitors or clients? However, this doesn't change the original image data. It's very easy to show a resized or cropped version of an image on a website using CSS.
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