Resize & Crop Images with Canvas: JS Guide

When it comes to modifying images in JavaScript, one powerful tool at your disposal is the HTML5 canvas element. With the canvas, you can resize and crop images to fit your needs. In this guide, we'll walk through the steps to resize and crop images using canvas in JavaScript.

First, we need to create a canvas element in our HTML code. We can do this with the following HTML code:



Next, we need to get the image we want to modify. We can do this with the following JavaScript code:


const img = new Image();
img.src = 'path/to/image.jpg';

Now that we have our canvas and image, we can start resizing and cropping. To resize an image, we need to use the canvas' drawImage() method. We can do this with the following JavaScript code:


const canvas = document.getElementById('myCanvas');
const ctx = canvas.getContext('2d');

const newWidth = 200;
const newHeight = 200;

ctx.drawImage(img, 0, 0, newWidth, newHeight);

This code will resize our image to 200 pixels by 200 pixels. The drawImage() method takes in several arguments: the image we want to draw, the x and y coordinates to start drawing at, and the new width and height of the image.

To crop an image, we can use the canvas' clip() method. We can do this with the following JavaScript code:


const canvas = document.getElementById('myCanvas');
const ctx = canvas.getContext('2d');

const newWidth = 200;
const newHeight = 200;
const startX = 50;
const startY = 50;

ctx.drawImage(img, startX, startY, newWidth, newHeight, 0, 0, newWidth, newHeight);

This code will crop our image to 200 pixels by 200 pixels, starting at 50 pixels from the left and 50 pixels from the top. The clip() method takes in the x and y coordinates to start clipping at, as well as the new width and height of the clipped image.

In summary, the HTML5 canvas element is a powerful tool for modifying images in JavaScript. With the drawImage() and clip() methods, we can easily resize and crop images to fit our needs.

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