HD Twitter

Improves Twitter's (X) image quality by replacing image formats. When clicking an image, JPEGs are replaced with lossless PNGs.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         HD Twitter
// @author       Duskdyr
// @description  Improves Twitter's (X) image quality by replacing image formats. When clicking an image, JPEGs are replaced with lossless PNGs.
// @match        *://*.x.com/*
// @match        *://*.twitter.com/*
// @grant        none
// @namespace    dskdr
// @license      MIT
// @version      1.0
// ==/UserScript==

(function() {
    'use strict';

    function imgrplcr() {
        document.querySelectorAll('img').forEach(img => {
            let url = img.src;

            if (url.includes('format=jpg') && url.includes('name=large')) {
                url = url.replace('=jpg', '=png');
//                url = url.replace('/feed_thumbnail', '/feed_fullsize');
            }
            if (img.src !== url) {
                img.src = url;
            }
        });
    }

    imgrplcr();

    const observer = new MutationObserver(imgrplcr);
    observer.observe(document.body, { childList: true, subtree: true });
})();