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// ==UserScript==
// @name YouTube Enhancer (Thumbnail Preview)
// @description View Original Avatar, Banner, Video and Shorts Thumbnails.
// @icon https://raw.githubusercontent.com/exyezed/youtube-enhancer/refs/heads/main/extras/youtube-enhancer.png
// @version 1.5
// @author exyezed
// @namespace https://github.com/exyezed/youtube-enhancer/
// @supportURL https://github.com/exyezed/youtube-enhancer/issues
// @license MIT
// @match https://www.youtube.com/*
// @grant GM_addStyle
// @grant GM_openInTab
// ==/UserScript==
(function() {
'use strict';
let GM_addStyle;
if (typeof GM_addStyle === 'undefined') {
GM_addStyle = function(css) {
let style = document.createElement('style');
style.textContent = css;
document.head.appendChild(style);
}
}
let GM_openInTab;
if (typeof GM_openInTab === 'undefined') {
GM_openInTab = function(url) {
window.open(url, '_blank');
}
}
GM_addStyle(`
.thumbnailPreview-button {
position: absolute;
bottom: 10px;
left: 5px;
background-color: rgba(0, 0, 0, 0.75);
color: white;
border: none;
border-radius: 3px;
padding: 3px;
font-size: 18px;
cursor: pointer;
z-index: 2000;
opacity: 0;
transition: opacity 0.3s;
display: flex;
align-items: center;
justify-content: center;
}
.thumbnailPreview-container {
position: relative;
}
.thumbnailPreview-container:hover .thumbnailPreview-button {
opacity: 1;
}
#thumbnailPreview-custom-image {
width: 100%;
height: auto;
margin-bottom: 10px;
box-sizing: border-box;
border-radius: 10px;
cursor: pointer;
}
.thumbnailShortsPreview {
position: absolute;
top: 5px;
left: 5px;
z-index: 2000;
background: rgba(0, 0, 0, 0.5);
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
display: flex;
align-items: center;
justify-content: center;
width: 24px;
height: 24px;
padding: 0;
transition: background-color 0.3s ease;
}
.thumbnailShortsPreview:hover {
background-color: rgba(0, 0, 0, 0.75) !important;
}
.youtube-enhancer-icon {
display: flex;
align-items: center;
justify-content: center;
width: 20px;
height: 20px;
}
.youtube-enhancer-icon svg {
width: 100%;
height: 100%;
}
`);
function createSVGElement(pathD) {
const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
svg.setAttribute("xmlns", "http://www.w3.org/2000/svg");
svg.setAttribute("width", "1em");
svg.setAttribute("height", "1em");
svg.setAttribute("viewBox", "0 0 24 24");
path.setAttribute("fill", "currentColor");
path.setAttribute("d", pathD);
svg.appendChild(path);
return svg;
}
function openImageInNewTab(url) {
if (!url) return;
try {
if (typeof GM_openInTab !== 'undefined') {
GM_openInTab(url, { active: true, insert: true, setParent: true });
} else {
const newWindow = window.open(url, '_blank');
if (newWindow) {
newWindow.focus();
}
}
} catch (e) {
const a = document.createElement('a');
a.href = url;
a.target = '_blank';
a.rel = 'noopener noreferrer';
document.body.appendChild(a);
a.click();
setTimeout(() => {
document.body.removeChild(a);
}, 100);
}
}
const defaultIconPath = "M18 20H4V6h9V4H4c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h14c1.1 0 2-.9 2-2v-9h-2zm-7.79-3.17l-1.96-2.36L5.5 18h11l-3.54-4.71zM20 4V1h-2v3h-3c.01.01 0 2 0 2h3v2.99c.01.01 2 0 2 0V6h3V4";
const hoverIconPath = "M19 7v2.99s-1.99.01-2 0V7h-3s.01-1.99 0-2h3V2h2v3h3v2zm-3 4V8h-3V5H5c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h12c1.1 0 2-.9 2-2v-8zM5 19l3-4l2 3l3-4l4 5z";
let thumbnailPreviewCurrentVideoId = '';
let thumbnailInsertionAttempts = 0;
const MAX_ATTEMPTS = 10;
const RETRY_DELAY = 500;
function isWatchPage() {
const url = new URL(window.location.href);
return url.pathname === '/watch' && (
url.searchParams.has('v') ||
url.searchParams.has('list') ||
url.searchParams.has('start_radio')
);
}
function addButtonToElement(element, getFullSizeUrl) {
if (!element.closest('.thumbnailPreview-container')) {
const container = document.createElement('div');
container.className = 'thumbnailPreview-container';
element.parentNode.insertBefore(container, element);
container.appendChild(element);
const button = document.createElement('button');
button.className = 'thumbnailPreview-button';
const defaultIcon = createSVGElement(defaultIconPath);
button.appendChild(defaultIcon);
button.addEventListener('mouseenter', () => {
button.textContent = '';
button.appendChild(createSVGElement(hoverIconPath));
});
button.addEventListener('mouseleave', () => {
button.textContent = '';
button.appendChild(createSVGElement(defaultIconPath));
});
button.addEventListener('click', function(e) {
if (e.stopPropagation) e.stopPropagation();
if (e.preventDefault) e.preventDefault();
e.cancelBubble = true;
const url = getFullSizeUrl(element.src);
if (url) {
openImageInNewTab(url);
}
return false;
}, true);
container.appendChild(button);
}
}
function processAvatars() {
const avatars = document.querySelectorAll('yt-avatar-shape img, yt-img-shadow#avatar img');
avatars.forEach(img => {
if (!img.closest('.thumbnailPreview-container')) {
addButtonToElement(img, (src) => src.replace(/=s\d+-c-k-c0x00ffffff-no-rj.*/, '=s0'));
if (isWatchPage()) {
const button = img.closest('.thumbnailPreview-container').querySelector('.thumbnailPreview-button');
if (button) {
button.style.display = 'none';
}
}
}
});
}
function processChannelBanners() {
const banners = document.querySelectorAll('yt-image-banner-view-model img');
banners.forEach(img => {
if (!img.closest('.thumbnailPreview-container')) {
addButtonToElement(img, (src) => src.replace(/=w\d+-.*/, '=s0'));
}
});
}
function processVideoThumbnails() {
const thumbnails = document.querySelectorAll('ytd-thumbnail img, ytd-playlist-thumbnail img');
thumbnails.forEach(img => {
if (!img.closest('.thumbnailPreview-container')) {
addButtonToElement(img, (src) => {
const videoId = src.match(/\/vi\/([^\/]+)/);
if (videoId && videoId[1]) {
return `https://i.ytimg.com/vi/${videoId[1]}/maxresdefault.jpg`;
}
return src;
});
}
});
}
function addOrUpdateThumbnailImage() {
const newVideoId = new URLSearchParams(window.location.search).get('v');
if (!newVideoId || newVideoId === thumbnailPreviewCurrentVideoId) {
return;
}
thumbnailPreviewCurrentVideoId = newVideoId;
function attemptInsertion() {
const targetElement = document.querySelector('#secondary-inner #panels');
const existingImg = document.getElementById('thumbnailPreview-custom-image');
if (existingImg) {
existingImg.src = `https://i.ytimg.com/vi/${thumbnailPreviewCurrentVideoId}/mqdefault.jpg`;
thumbnailInsertionAttempts = 0;
return;
}
if (!targetElement) {
thumbnailInsertionAttempts++;
if (thumbnailInsertionAttempts < MAX_ATTEMPTS) {
setTimeout(attemptInsertion, RETRY_DELAY);
} else {
thumbnailInsertionAttempts = 0;
}
return;
}
const img = document.createElement('img');
img.id = 'thumbnailPreview-custom-image';
img.src = `https://i.ytimg.com/vi/${thumbnailPreviewCurrentVideoId}/mqdefault.jpg`;
img.addEventListener('click', function(e) {
if (e.stopPropagation) e.stopPropagation();
if (e.preventDefault) e.preventDefault();
e.cancelBubble = true;
const maxResUrl = `https://i.ytimg.com/vi/${thumbnailPreviewCurrentVideoId}/maxresdefault.jpg`;
openImageInNewTab(maxResUrl);
return false;
}, true);
targetElement.parentNode.insertBefore(img, targetElement);
thumbnailInsertionAttempts = 0;
}
attemptInsertion();
}
function getVideoIdFromShorts(href) {
const match = href.match(/\/shorts\/([^/?]+)/);
return match ? match[1] : null;
}
function findShortsContainers() {
let containers = [];
const reelItems = document.querySelectorAll('ytd-reel-item-renderer');
if (reelItems.length > 0) {
containers = Array.from(reelItems);
} else {
const shortsLockup = document.querySelectorAll('ytm-shorts-lockup-view-model.ShortsLockupViewModelHost');
if (shortsLockup.length > 0) {
containers = Array.from(shortsLockup);
} else {
const gridVideos = document.querySelectorAll('ytd-grid-video-renderer');
containers = Array.from(gridVideos).filter(container => {
const link = container.querySelector('a[href*="/shorts/"]');
return link !== null;
});
if (containers.length === 0) {
const richItems = document.querySelectorAll('ytd-rich-item-renderer');
containers = Array.from(richItems).filter(container => {
const link = container.querySelector('a[href*="/shorts/"]');
return link !== null;
});
}
}
}
return containers;
}
function addShortsThumbnailButton(container) {
if (container.querySelector('.thumbnailShortsPreview') || container.dataset.shortsButtonAdded === 'true') {
return;
}
let linkElement = container.querySelector('a[href*="/shorts/"]');
if (!linkElement && container.tagName === 'A' && container.href && container.href.includes('/shorts/')) {
linkElement = container;
}
if (!linkElement) {
return;
}
const videoId = getVideoIdFromShorts(linkElement.href);
if (!videoId) {
return;
}
let thumbnailContainer = container.querySelector('#thumbnail');
if (!thumbnailContainer) {
thumbnailContainer = container.querySelector('.thumbnail');
}
if (!thumbnailContainer) {
thumbnailContainer = container;
}
const button = document.createElement('button');
button.className = 'thumbnailShortsPreview';
button.title = 'View original thumbnail';
const iconContainer = document.createElement('span');
iconContainer.className = 'youtube-enhancer-icon';
const defaultIcon = createSVGElement(defaultIconPath);
iconContainer.appendChild(defaultIcon);
button.appendChild(iconContainer);
button.addEventListener('mouseenter', () => {
iconContainer.removeChild(iconContainer.firstChild);
iconContainer.appendChild(createSVGElement(hoverIconPath));
});
button.addEventListener('mouseleave', () => {
iconContainer.removeChild(iconContainer.firstChild);
iconContainer.appendChild(createSVGElement(defaultIconPath));
});
button.addEventListener('click', function(e) {
if (e.stopPropagation) e.stopPropagation();
if (e.preventDefault) e.preventDefault();
e.cancelBubble = true;
const url = `https://i.ytimg.com/vi/${videoId}/oardefault.jpg`;
openImageInNewTab(url);
return false;
}, true);
thumbnailContainer.style.position = 'relative';
thumbnailContainer.appendChild(button);
container.dataset.shortsButtonAdded = 'true';
}
function observePageChanges() {
const contentObserver = new MutationObserver((mutations) => {
let shouldProcessRegular = false;
let shouldProcessShorts = false;
mutations.forEach(mutation => {
if (mutation.addedNodes.length > 0) {
shouldProcessRegular = true;
shouldProcessShorts = true;
}
});
if (shouldProcessRegular) {
processAvatars();
processChannelBanners();
processVideoThumbnails();
}
if (shouldProcessShorts) {
const shortsContainers = findShortsContainers();
shortsContainers.forEach(addShortsThumbnailButton);
}
});
const panelObserver = new MutationObserver((mutations) => {
for (const mutation of mutations) {
if (mutation.type === 'childList' &&
(mutation.target.id === 'secondary' ||
mutation.target.id === 'secondary-inner')) {
addOrUpdateThumbnailImage();
}
}
});
contentObserver.observe(document.body, {
childList: true,
subtree: true
});
const observeSecondary = () => {
const secondary = document.getElementById('secondary');
if (secondary) {
panelObserver.observe(secondary, {
childList: true,
subtree: true
});
} else {
setTimeout(observeSecondary, 1000);
}
};
observeSecondary();
}
function initialize() {
processAvatars();
processChannelBanners();
processVideoThumbnails();
addOrUpdateThumbnailImage();
const shortsContainers = findShortsContainers();
shortsContainers.forEach(addShortsThumbnailButton);
observePageChanges();
window.addEventListener('yt-navigate-finish', () => {
addOrUpdateThumbnailImage();
setTimeout(() => {
const shortsContainers = findShortsContainers();
shortsContainers.forEach(addShortsThumbnailButton);
}, 1000);
});
setInterval(() => {
const shortsContainers = findShortsContainers();
shortsContainers.forEach(addShortsThumbnailButton);
}, 3000);
}
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', initialize);
} else {
initialize();
}
})();