We do this by creating an HTML5 element and drawing the image to the canvas at a particular size, then extracting the new image data from the canvas as a data URI. Instead we can resize the image on the client side before uploading it, which is fast. Whilst we could do this on the server, it would require the transfer of a potentially large file, which is slow. In a real world example a website or app might use a technique like this to resize and frame a profile picture before uploading. In the final line, the new height and width values are assigned using CSS.In this tutorial we’re going to learn how to resize and crop an image using the HTML5 element, and while we’re at it, let’s create some fancy controls for resizing, commonly seen in photo editing applications.

The if statement checks which side of the image needs to be kept to the maximum and the other one is calculated proportionally. Then using jQuery match all img elements and using the each function, we go through each one of them resizing them as necessary. First of all, a variable is declared called max_size that is set to the maximum height or width that the picture needs to be resized to. The script resizes the images without distorting the proportions. Var h = Math.ceil($(this).height() / $(this).width() * max_size) Var w = Math.ceil($(this).width() / $(this).height() * max_size) How to dynamically image re-size after loaded images, by using JQuery.This script resizing images without distorting the proportions.jQuery match all img elements and using the each function, we go through each one of them resizing them as necessary.

Javascript resize image client side