How to Download Subtitles
on YouTube in 2026

The manual way: YouTube's timedtext request

If you'd rather not install anything, you can grab the file by hand. Open DevTools (F12), go to the Network tab, filter for timedtext, and turn captions on. YouTube fires a request that looks like this:

Open it and you don't get clean subtitles — you get YouTube's internal srv3 / json3 format, a blob that looks nothing like a subtitle file:

{
  "wireMagic": "pb3",
  "events": [
    { "tStartMs": 3280, "dDurationMs": 3240,
      "segs": [ { "utf8": "This" }, { "utf8": " tax", "tOffsetMs": 240 } ] },
    { "tStartMs": 13679, "dDurationMs": 3641,
      "segs": [ { "utf8": "we" }, { "utf8": " drift.", "tOffsetMs": 641 } ] }
  ]
}

Every word is a separate seg with its own millisecond offset — designed for YouTube's animated caption rollout, not for reading. To get a usable .vtt or .srt you have to parse this JSON, merge the word segments back into lines, and rebuild the timestamps. That's exactly the conversion the extension does automatically — it reads the same request and hands you a clean file. For the full walkthrough of the Network-tab method across sites, see our DevTools extraction guide.