How to Resize Images Client-Side Using JavaScript without Plugins?

Resizing Images Client-Side Using JavaScript

Image manipulation is a crucial aspect of web development, and resizing images efficiently is essential for optimizing user experience and website performance. Flash has traditionally been used for image resizing, but with advancements in JavaScript, it is now possible to resize images client-side without the need for additional plugins.

For developers seeking an open-source solution for resizing images in JavaScript, the following resources provide robust and reliable options:

Github Gist:

This gist offers both ES6 and JavaScript versions of an image resizing algorithm: https://gist.github.com/dcollien/312bce1270a5f511bf4a.

Usage:

document.getElementById('select').onchange = function(evt) {
    ImageTools.resize(this.files[0], {
        width: 320, // maximum width
        height: 240 // maximum height
    }, function(blob, didItResize) {
        // didItResize will be true if it managed to resize it, otherwise false (and will return the original file as 'blob')
        document.getElementById('preview').src = window.URL.createObjectURL(blob);
        // you can also now upload this blob using an XHR.
    });
};

Features:

• Supports resizing of various image formats.
• Includes polyfills to ensure compatibility with older browsers.
• Ignores animated GIFs for compatibility reasons.

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