Summarize any YouTube video
Paste a link, get a TL;DR with key points. Free, no signup — powered by the video's own transcript.
How to summarize a YouTube video
- Paste the video URL above and press Summarize.
- The tool pulls the video's transcript and condenses it with AI.
- Read the TL;DR and key points — usually under 30 seconds for any video.
Summaries are generated from the caption track, so they reflect what the speaker actually said. That's the difference between a real summary and a guess from the title and thumbnail — and it's why videos with captions disabled can't be summarized.
When a summary beats watching
- Triaging a watch-later queue — decide in seconds which videos deserve full attention.
- Long-form podcasts and talks — get the argument without the 90 minutes.
- Tutorials — check whether the video actually covers your problem before committing.
If you triage videos every day, do it where the videos live: the Marqly extension streams the summary next to the player the moment you open a watch page — with key sections, books mentioned, a synced transcript, and chat grounded in the transcript. Saved videos keep their transcripts, so you can find and quote them months later.
Frequently asked questions
How does the YouTube summarizer work?
It fetches the video’s caption track, then an AI model condenses it into a short TL;DR plus key points. The summary is grounded in the transcript — it summarizes what was actually said, not what the title promises.
Does it work on videos without captions?
No. If a video has captions disabled there is no transcript to summarize. Most YouTube videos have at least auto-generated captions, which work fine here.
Is there a length limit?
Very long videos are summarized from roughly the first hour of the transcript. The Marqly extension handles full-length videos and adds section-by-section breakdowns, books mentioned, and a chat tab that answers questions from the whole transcript.
Is this free?
Yes — no signup required. It’s a taste of what the Marqly extension does automatically on every YouTube watch page: streaming summary, key sections, playback-synced transcript, and transcript-grounded chat.