Screenshot the current frame of any YouTube video and download it in high resolution
// ==UserScript==
// @name YouTube Screenshot MacOS Download
// @description Screenshot the current frame of any YouTube video and download it in high resolution
// @version 1.6
// @icon https://i.imgur.com/UbC1oPW.png
// @match https://*.youtube.com/*
// @license MIT
// @namespace https://greasyfork.org/users/572660
// ==/UserScript==
let escapeHTMLPolicy = 'trustedTypes' in window
? trustedTypes.createPolicy('forceInner', { createHTML: html=>html })
: { createHTML: html=>html };
function update(){
let $miniplayerBtn = document.querySelector('button.ytp-miniplayer-button');
if($miniplayerBtn && !$miniplayerBtn.previousElementSibling?.classList.contains('ytp-screenshot-button')){
const $btn = document.createElement('button');
$btn.id = 'ytp-screenshot-button';
$btn.classList.add('ytp-screenshot-button', 'ytp-button');
$btn.dataset.priority = '5';
$btn.dataset.tooltipTargetId = 'ytp-screenshot-button';
$btn.dataset.titleNoTooltip = 'Screenshot';
$btn.ariaLabel = 'Screenshot';
$btn.title = 'Screenshot';
$btn.innerHTML = escapeHTMLPolicy.createHTML(`<svg height="100%" version="1.1" viewBox="-300 -1260 1560 1560" width="100%">
<use class="ytp-svg-shadow" xlink:href="#ytp-id-screenshot-svg"></use>
<path
d="M200-120q-33 0-56.5-23.5T120-200v-560q0-33 23.5-56.5T200-840h560q33 0 56.5 23.5T840-760v560q0 33-23.5 56.5T760-120H200Zm0-80h560v-560H200v560Zm40-80h480L570-480 450-320l-90-120-120 160Zm-40 80v-560 560Z"
fill="#fff" id="ytp-id-screenshot-svg"></path>
</svg>`);
$btn.addEventListener('click', screenshot);
insertBefore($btn, $miniplayerBtn);
}
requestAnimationFrame(update);
}
requestAnimationFrame(update);
function insertBefore($element, $sibling){
$sibling.parentElement.insertBefore($element, $sibling);
}
function screenshot(){
const $video = document.querySelector('#player video, #movie_player video');
if(!$video){
console.error('No video found to screenshot!');
return;
}
let wasPlaying = !$video.paused;
if(wasPlaying) $video.pause();
const $canvas = document.createElement('canvas');
$canvas.width = $video.videoWidth;
$canvas.height = $video.videoHeight;
let oldCss = $video.style.cssText;
$video.style.width = $video.videoWidth + 'px';
$video.style.height = $video.videoHeight + 'px';
const ctx = $canvas.getContext('2d');
ctx.drawImage($video, 0, 0, $video.videoWidth, $video.videoHeight);
$canvas.toBlob(blob=>{
let url = URL.createObjectURL(blob);
let a = document.createElement('a');
a.style.display = 'none';
a.href = url;
a.download = document.title + '.png';
document.body.appendChild(a);
a.click();
a.remove();
URL.revokeObjectURL(url);
$video.style.cssText = oldCss;
$canvas.remove();
if(wasPlaying) $video.play();
});
}