Allows you to download available subtitles for YouTube videos in various languages directly from the video page.
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// ==UserScript==
// @name YouTube Enhancer (Subtitle Downloader)
// @description Allows you to download available subtitles for YouTube videos in various languages directly from the video page.
// @icon https://raw.githubusercontent.com/exyezed/youtube-enhancer/refs/heads/main/extras/youtube-enhancer.png
// @version 1.1
// @author exyezed
// @namespace https://github.com/exyezed/youtube-enhancer/
// @supportURL https://github.com/exyezed/youtube-enhancer/issues
// @license MIT
// @match https://www.youtube.com/*
// @match https://youtube.com/*
// @grant none
// @run-at document-idle
// ==/UserScript==
(function() {
'use strict';
function xmlToSrt(xmlText) {
const parser = new DOMParser();
const xmlDoc = parser.parseFromString(xmlText, "text/xml");
const textNodes = xmlDoc.getElementsByTagName("text");
let srtContent = '';
for (let i = 0; i < textNodes.length; i++) {
const node = textNodes[i];
const start = parseFloat(node.getAttribute("start"));
const duration = parseFloat(node.getAttribute("dur") || "0");
const end = start + duration;
const formatTime = (time) => {
const hours = Math.floor(time / 3600);
const minutes = Math.floor((time % 3600) / 60);
const seconds = Math.floor(time % 60);
const milliseconds = Math.floor((time % 1) * 1000);
return `${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}:${String(seconds).padStart(2, '0')},${String(milliseconds).padStart(3, '0')}`;
};
srtContent += `${i + 1}\n`;
srtContent += `${formatTime(start)} --> ${formatTime(end)}\n`;
srtContent += `${node.textContent}\n\n`;
}
return srtContent;
}
function createSVGIcon(className, isHover = false) {
const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
svg.setAttribute("viewBox", "0 0 576 512");
svg.classList.add(className);
path.setAttribute("d", isHover
? "M64 32C28.7 32 0 60.7 0 96L0 416c0 35.3 28.7 64 64 64l448 0c35.3 0 64-28.7 64-64l0-320c0-35.3-28.7-64-64-64L64 32zm56 208l176 0c13.3 0 24 10.7 24 24s-10.7 24-24 24l-176 0c-13.3 0-24-10.7-24-24s10.7-24 24-24zm256 0l80 0c13.3 0 24 10.7 24 24s-10.7 24-24 24l-80 0c-13.3 0-24-10.7-24-24s10.7-24 24-24zM120 336l80 0c13.3 0 24 10.7 24 24s-10.7 24-24 24l-80 0c-13.3 0-24-10.7-24-24s10.7-24 24-24zm160 0l176 0c13.3 0 24 10.7 24 24s-10.7 24-24 24l-176 0c-13.3 0-24-10.7-24-24s10.7-24 24-24z"
: "M64 80c-8.8 0-16 7.2-16 16l0 320c0 8.8 7.2 16 16 16l448 0c8.8 0 16-7.2 16-16l0-320c0-8.8-7.2-16-16-16L64 80zM0 96C0 60.7 28.7 32 64 32l448 0c35.3 0 64 28.7 64 64l0 320c0 35.3-28.7 64-64 64L64 480c-35.3 0-64-28.7-64-64L0 96zM120 240l176 0c13.3 0 24 10.7 24 24s-10.7 24-24 24l-176 0c-13.3 0-24-10.7-24-24s10.7-24 24-24zm256 0l80 0c13.3 0 24 10.7 24 24s-10.7 24-24 24l-80 0c-13.3 0-24-10.7-24-24s10.7-24 24-24zM120 336l80 0c13.3 0 24 10.7 24 24s-10.7 24-24 24l-80 0c-13.3 0-24-10.7-24-24s10.7-24 24-24zm160 0l176 0c13.3 0 24 10.7 24 24s-10.7 24-24 24l-176 0c-13.3 0-24-10.7-24-24s10.7-24 24-24z"
);
svg.appendChild(path);
return svg;
}
function getVideoId() {
const urlParams = new URLSearchParams(window.location.search);
return urlParams.get('v');
}
function createDropdown(languages, videoTitle) {
const dropdown = document.createElement('div');
dropdown.className = 'subtitle-dropdown';
const titleDiv = document.createElement('div');
titleDiv.className = 'subtitle-dropdown-title';
titleDiv.textContent = `Download Subtitles (${languages.length})`;
dropdown.appendChild(titleDiv);
languages.forEach((lang) => {
const option = document.createElement('div');
option.className = 'subtitle-option';
option.dataset.url = lang.url;
option.textContent = lang.label;
dropdown.appendChild(option);
});
return dropdown;
}
async function handleSubtitleDownload(e) {
e.preventDefault();
const videoId = getVideoId();
if (!videoId) {
console.error('Video ID not found');
return;
}
try {
const player = document.querySelector('#movie_player');
if (!player || !player.getPlayerResponse) {
console.error('Player not found or API not available');
return;
}
const playerResponse = player.getPlayerResponse();
const captions = playerResponse?.captions?.playerCaptionsTracklistRenderer?.captionTracks;
if (!captions || captions.length === 0) {
alert('No subtitles available for this video');
return;
}
const languages = captions.map(caption => ({
label: caption.name.simpleText,
url: caption.baseUrl
}));
const backdrop = document.createElement('div');
backdrop.className = 'subtitle-backdrop';
document.body.appendChild(backdrop);
const videoTitleElement = document.querySelector('yt-formatted-string.style-scope.ytd-watch-metadata');
const videoTitle = videoTitleElement ? videoTitleElement.textContent.trim() : 'video';
const dropdown = createDropdown(languages, videoTitle);
document.body.appendChild(dropdown);
const closeDropdown = (e) => {
if (!dropdown.contains(e.target) && !e.target.closest('.custom-subtitle-btn')) {
dropdown.remove();
backdrop.remove();
document.removeEventListener('click', closeDropdown);
}
};
dropdown.addEventListener('click', async (event) => {
const option = event.target.closest('.subtitle-option');
if (!option) return;
const url = option.dataset.url;
const langLabel = option.textContent.trim();
try {
option.classList.add('loading');
const response = await fetch(url);
if (!response.ok) throw new Error('Network response was not ok');
const xmlContent = await response.text();
const srtContent = xmlToSrt(xmlContent);
const blob = new Blob([srtContent], { type: 'text/plain' });
const downloadUrl = URL.createObjectURL(blob);
const link = document.createElement('a');
link.href = downloadUrl;
link.download = `${videoTitle} - ${langLabel}.srt`;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
URL.revokeObjectURL(downloadUrl);
dropdown.remove();
backdrop.remove();
} catch (error) {
console.error('Error downloading subtitles:', error);
option.classList.remove('loading');
alert('Error downloading subtitles. Please try again.');
}
});
setTimeout(() => {
document.addEventListener('click', closeDropdown);
}, 100);
} catch (error) {
console.error('Error handling subtitle download:', error);
alert('Error accessing video subtitles. Please try again.');
}
}
function initializeStyles(computedStyle) {
if (document.querySelector('#yt-subtitle-downloader-styles')) return;
const style = document.createElement('style');
style.id = 'yt-subtitle-downloader-styles';
style.textContent = `
.custom-subtitle-btn {
background: none;
border: none;
cursor: pointer;
padding: 0;
width: ${computedStyle.width};
height: ${computedStyle.height};
display: flex;
align-items: center;
justify-content: center;
position: relative;
}
.custom-subtitle-btn svg {
width: 24px;
height: 24px;
fill: #fff;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
opacity: 1;
transition: opacity 0.2s ease-in-out;
}
.custom-subtitle-btn .hover-icon {
opacity: 0;
}
.custom-subtitle-btn:hover .default-icon {
opacity: 0;
}
.custom-subtitle-btn:hover .hover-icon {
opacity: 1;
}
.subtitle-dropdown {
position: fixed;
background: rgba(28, 28, 28, 0.95);
border: 1px solid rgba(255, 255, 255, 0.1);
border-radius: 8px;
padding: 12px;
z-index: 9999;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
min-width: 200px;
box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
backdrop-filter: blur(10px);
}
.subtitle-dropdown-title {
color: #fff;
font-size: 14px;
font-weight: 500;
margin-bottom: 8px;
padding: 0 8px;
text-align: center;
}
.subtitle-option {
color: #fff;
padding: 8px 12px;
margin: 2px 0;
cursor: pointer;
border-radius: 4px;
transition: all 0.2s;
display: flex;
align-items: center;
font-size: 13px;
white-space: nowrap;
}
.subtitle-option:hover {
background-color: rgba(255, 255, 255, 0.1);
}
.subtitle-option::before {
content: "●";
margin-right: 8px;
font-size: 8px;
color: #aaa;
}
.subtitle-option.loading {
opacity: 0.5;
pointer-events: none;
}
.subtitle-backdrop {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.5);
z-index: 9998;
}
`;
document.head.appendChild(style);
}
function initializeButton() {
if (document.querySelector('.custom-subtitle-btn')) return;
const originalButton = document.querySelector('.ytp-subtitles-button');
if (!originalButton) return;
const newButton = document.createElement('button');
const computedStyle = window.getComputedStyle(originalButton);
Object.assign(newButton, {
className: 'ytp-button custom-subtitle-btn',
title: 'Download Subtitles'
});
newButton.setAttribute('aria-pressed', 'false');
initializeStyles(computedStyle);
newButton.append(
createSVGIcon('default-icon', false),
createSVGIcon('hover-icon', true)
);
newButton.addEventListener('click', (e) => {
const existingDropdown = document.querySelector('.subtitle-dropdown');
existingDropdown ? existingDropdown.remove() : handleSubtitleDownload(e);
});
originalButton.insertAdjacentElement('afterend', newButton);
}
function initializeObserver() {
const observer = new MutationObserver((mutations) => {
mutations.forEach((mutation) => {
if (mutation.addedNodes.length) {
const isVideoPage = window.location.pathname === '/watch';
if (isVideoPage && !document.querySelector('.custom-subtitle-btn')) {
initializeButton();
}
}
});
});
function startObserving() {
const playerContainer = document.getElementById('player-container');
const contentContainer = document.getElementById('content');
if (playerContainer) {
observer.observe(playerContainer, {
childList: true,
subtree: true
});
}
if (contentContainer) {
observer.observe(contentContainer, {
childList: true,
subtree: true
});
}
if (window.location.pathname === '/watch') {
initializeButton();
}
}
startObserving();
if (!document.getElementById('player-container')) {
const retryInterval = setInterval(() => {
if (document.getElementById('player-container')) {
startObserving();
clearInterval(retryInterval);
}
}, 1000);
setTimeout(() => clearInterval(retryInterval), 10000);
}
const handleNavigation = () => {
if (window.location.pathname === '/watch') {
initializeButton();
}
};
window.addEventListener('yt-navigate-finish', handleNavigation);
return () => {
observer.disconnect();
window.removeEventListener('yt-navigate-finish', handleNavigation);
};
}
addSubtitleButton();
function addSubtitleButton() {
initializeObserver();
}
console.log('YouTube Enhancer (Subtitle Downloader) is running');
})();
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