function downloadStream(url, filename) // Use GM_download if available (Tampermonkey) if (typeof GM_download !== 'undefined') GM_download( url: url, name: filename, saveAs: true ); else // Fallback: create an anchor and click const a = document.createElement('a'); a.href = url; a.download = filename; document.body.appendChild(a); a.click(); document.body.removeChild(a);
The script adds a download button to YouTube pages. When clicked, it fetches the video/audio stream and saves it locally via the browser's download API. local youtube downloader tampermonkey
This means YouTube served the video as an encrypted DASH stream. Solution: Use the "Copy debug info" button (if your script has one) and paste it into the script’s support thread. Solution: Use the "Copy debug info" button (if
YouTube constantly changes its HTML class names and button IDs. Scripts break. Solution: Check the script’s "Discussion" page on GreasyFork. Look for a comment saying "Fix for 2025 layout" or install a user-updated fork. the processing happens on your machine.
: Most local scripts don't send your data to external servers; the processing happens on your machine.
I ran a test using a 1.2GB 4K video (MKBHD’s "I built a desk").
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