When to use

You have a video that you want to get some info out from, but not watch

How to set up

Add a bookmark / favorito in your top bar (I mean wherever, but top bar works best), one quick way to do it is to add whatever you have right now with Ctrl + D and then edit it.
Set the name to something like: "Get transcript from youtube"
Then on the URL paste this:

javascript: (function() {
var captions = "";
try {
document.querySelector("ytd-menu-service-item-renderer.style-scope:nth-child(2) > tp-yt-paper-item:nth-child(1) > yt-formatted-string:nth-child(2)").click();
} catch (ex) {}
[].slice.call(document.querySelectorAll("ytd-transcript-segment-renderer > div > yt-formatted-string"))
.forEach(caption => captions += caption.textContent + " ");
navigator.clipboard.writeText(captions)
})()

How to use

Go to said video, click on "...expand" / "...más" on the description, click on "Show Transcription" / "Mostrar Transcripción", Transcription shows up.
Click on the bookmarklet we just created, now you got the whole text in your clipboard

Go to a llm, Deepseek R1, Gemini App or Claude 3.7 Sonnet work best at this, paste your text and give it a command like:
"Summarize this text into actionable bullet points"

Enjoy

• Bookmarklet
• JavaScript