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Adds a button to copy the video transcript next to the like/share buttons. Safely handles Trusted Types and SPA navigation.
// ==UserScript==
// @name YouTube Transcript Copier
// @namespace http://tampermonkey.net/
// @version 1.0
// @description Adds a button to copy the video transcript next to the like/share buttons. Safely handles Trusted Types and SPA navigation.
// @author You
// @match https://www.youtube.com/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant none
// @license MIT
// ==/UserScript==
(function() {
'use strict';
const SELECTORS = {
BAR: '#top-level-buttons-computed',
TRANSCRIPT_RENDERER: 'ytd-transcript-renderer',
SEGMENT: 'ytd-transcript-segment-renderer',
TIMESTAMP: '.segment-timestamp',
TEXT: '.segment-text',
SHOW_TRANSCRIPT_BTN: 'button[aria-label="Show transcript"]',
EXPAND_DESC_BTN: '#expand',
DESCRIPTION_CONTAINER: 'ytd-text-inline-expander'
};
const BUTTON_ID = 'yt-custom-transcript-copy-btn';
// SVG Icon Data for the Clipboard (Safe creation)
function createCopyIcon() {
const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
svg.setAttribute("viewBox", "0 0 24 24");
svg.setAttribute("height", "24");
svg.setAttribute("width", "24");
svg.setAttribute("focusable", "false");
svg.style.display = "block";
svg.style.fill = "currentColor";
const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
path.setAttribute("d", "M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z");
svg.appendChild(path);
return svg;
}
// Helper to wait for elements (needed because transcript loads lazily)
function waitForElement(selector, timeout = 2000) {
return new Promise((resolve) => {
if (document.querySelector(selector)) {
return resolve(document.querySelector(selector));
}
const observer = new MutationObserver((mutations) => {
if (document.querySelector(selector)) {
observer.disconnect();
resolve(document.querySelector(selector));
}
});
observer.observe(document.body, { childList: true, subtree: true });
setTimeout(() => {
observer.disconnect();
resolve(null);
}, timeout);
});
}
// The Main Copy Logic
async function handleCopyClick(btnElement) {
const originalText = btnElement.innerText;
btnElement.innerText = "Loading...";
try {
// 1. Check if transcript is visible
let segments = document.querySelectorAll(SELECTORS.SEGMENT);
// 2. If not, try to open it automatically
if (segments.length === 0) {
// Check for "Show Transcript" button immediately
let showBtn = Array.from(document.querySelectorAll('button')).find(b =>
b.ariaLabel === 'Show transcript' || (b.textContent && b.textContent.includes('Show transcript'))
);
// If not found, try expanding the description
if (!showBtn) {
const expandBtn = document.querySelector(SELECTORS.EXPAND_DESC_BTN);
if (expandBtn && expandBtn.offsetParent !== null) { // Check visibility
expandBtn.click();
// Short wait for description expansion
await new Promise(r => setTimeout(r, 500));
// Look again for show transcript button
showBtn = Array.from(document.querySelectorAll('button')).find(b =>
b.ariaLabel === 'Show transcript' || (b.textContent && b.textContent.includes('Show transcript'))
);
}
}
if (showBtn) {
showBtn.click();
// Wait for the transcript panel to render
await waitForElement(SELECTORS.SEGMENT, 3000);
segments = document.querySelectorAll(SELECTORS.SEGMENT);
}
}
// 3. Scrape Data
if (segments.length > 0) {
let transcriptText = "";
segments.forEach(seg => {
const time = seg.querySelector(SELECTORS.TIMESTAMP)?.textContent?.trim().replace(/\s+/g, ' ') || "";
const text = seg.querySelector(SELECTORS.TEXT)?.textContent?.trim().replace(/\s+/g, ' ') || "";
if (text) {
transcriptText += `[${time}] ${text}\n`;
}
});
if (transcriptText) {
await navigator.clipboard.writeText(transcriptText);
btnElement.innerText = "Copied!";
} else {
btnElement.innerText = "Empty!";
}
} else {
alert("Could not find transcript. Please open the transcript panel manually.");
btnElement.innerText = "Failed";
}
} catch (err) {
console.error("Transcript copy error:", err);
btnElement.innerText = "Error";
}
// Reset button text after 2 seconds
setTimeout(() => {
// Re-build the inner structure of the button safely
btnElement.innerText = "";
const iconDiv = document.createElement("div");
iconDiv.className = "yt-spec-button-shape-next__icon";
iconDiv.setAttribute("aria-hidden", "true");
const iconWrapper = document.createElement("span");
iconWrapper.style.width = "24px";
iconWrapper.style.height = "24px";
iconWrapper.style.display = "inline-block";
iconWrapper.appendChild(createCopyIcon());
iconDiv.appendChild(iconWrapper);
const textDiv = document.createElement("div");
textDiv.className = "yt-spec-button-shape-next__button-text-content";
textDiv.innerText = "Transcript";
textDiv.style.marginLeft = "6px";
btnElement.appendChild(iconDiv);
btnElement.appendChild(textDiv);
}, 2000);
}
// Function to inject the button
function injectButton() {
// Prevent duplicate injection
if (document.getElementById(BUTTON_ID)) return;
const container = document.querySelector(SELECTORS.BAR);
if (!container) return;
// Create the Button Wrapper (ViewModel mimic)
const wrapper = document.createElement('div');
wrapper.className = 'yt-button-view-model style-scope ytd-menu-renderer';
wrapper.id = BUTTON_ID;
wrapper.style.display = 'flex';
wrapper.style.alignItems = 'center';
wrapper.style.marginLeft = '8px'; // Spacing from other buttons
// Create the Button (mimicking Share button classes)
const button = document.createElement('button');
button.className = 'yt-spec-button-shape-next yt-spec-button-shape-next--tonal yt-spec-button-shape-next--mono yt-spec-button-shape-next--size-m yt-spec-button-shape-next--icon-leading yt-spec-button-shape-next--enable-backdrop-filter-experiment';
button.setAttribute('aria-label', 'Copy Transcript');
button.style.cursor = 'pointer';
// 1. Icon Container
const iconDiv = document.createElement("div");
iconDiv.className = "yt-spec-button-shape-next__icon";
iconDiv.setAttribute("aria-hidden", "true");
// 2. Icon Content
const iconWrapper = document.createElement("span");
iconWrapper.style.width = "24px";
iconWrapper.style.height = "24px";
iconWrapper.style.display = "inline-block";
iconWrapper.appendChild(createCopyIcon()); // Safe DOM node append
iconDiv.appendChild(iconWrapper);
// 3. Text Content
const textDiv = document.createElement("div");
textDiv.className = "yt-spec-button-shape-next__button-text-content";
textDiv.innerText = "Transcript";
// Append parts to button
button.appendChild(iconDiv);
button.appendChild(textDiv);
// Add Click Listener
button.addEventListener('click', (e) => {
e.preventDefault();
e.stopPropagation();
handleCopyClick(button);
});
wrapper.appendChild(button);
// Insert as the first item in the menu container, or append
// Appending usually puts it next to "Share" or "Download"
container.appendChild(wrapper);
}
// Observer to handle SPA navigation and dynamic loading
const observer = new MutationObserver((mutations) => {
// Check if our target container exists but our button doesn't
const container = document.querySelector(SELECTORS.BAR);
if (container && !document.getElementById(BUTTON_ID)) {
injectButton();
}
});
// Start Observing
observer.observe(document.body, {
childList: true,
subtree: true
});
// Initial check
injectButton();
})();