Convert all youtube urls on a webpage to youtube-nocookie.com urls

convert-all-youtube-urls-to-nocookie-bookmarklet.js

javascript:void%20function(){const%20a=document.querySelectorAll(%22a%22);a.forEach(a=%3E{if(-1!==a.href.indexOf(%22youtube.com%22)){const%20b=new%20URL(a.href).searchParams,c=b.get(%22v%22);c%26%26(a.href=%22https://www.youtube-nocookie.com/embed/%22+c)}else-1!==a.href.indexOf(%22youtu.be%22)%26%26(a.href=a.href.replace(%22//youtu.be/%22,%22//www.youtube-nocookie.com/embed/%22))});const%20b=document.querySelectorAll(%22iframe%22);b.forEach(a=%3E{-1===a.src.indexOf(%22//www.youtube.com%22)%3F-1!==a.src.indexOf(%22//youtube.com%22)%26%26(a.src=a.src.replace(%22//youtube.com/%22,%22//www.youtube-nocookie.com/%22)):a.src=a.src.replace(%22//www.youtube.com/%22,%22//www.youtube-nocookie.com/%22)})}();

convert-all-youtube-urls-to-nocookie-source.js

// check links
const allUrls = document.querySelectorAll("a");
allUrls.forEach((urlElement) => {
  if (urlElement.href.indexOf("youtube.com") !== -1) {
    const search = new URL(urlElement.href).searchParams;
    const videoId = search.get("v");
    if (videoId) {
      urlElement.href = "https://www.youtube-nocookie.com/embed/" + videoId;
    }
  } else if (urlElement.href.indexOf("youtu.be") !== -1) {
    urlElement.href = urlElement.href.replace(
      "//youtu.be/",
      "//www.youtube-nocookie.com/embed/"
    );
  }
});

// check iframes for embeds
const allEmbedUrls = document.querySelectorAll("iframe");
allEmbedUrls.forEach((urlElement) => {
  if (urlElement.src.indexOf("//www.youtube.com") !== -1) {
    urlElement.src = urlElement.src.replace(
      "//www.youtube.com/",
      "//www.youtube-nocookie.com/"
    );
  } else if (urlElement.src.indexOf("//youtube.com") !== -1) {
    urlElement.src = urlElement.src.replace(
      "//youtube.com/",
      "//www.youtube-nocookie.com/"
    );
  }
});

More info about this bookmarklet on this page