How to summarize a YouTube video without downloading it
Open the video, click Silestis, and get a summary plus timestamped answers in about 30 seconds — no download, no copy-paste.
The fastest way: one click on the page
You're already watching the video — so you don't need to download anything or paste a link. With the Silestis extension for Safari and Chrome, one click on the page grabs the audio and returns a summary, the key points, and a timestamped transcript underneath. A one-hour video is typically ready in about 30 seconds.
No download, no copy-paste
Downloading a YouTube video is slow, clutters your disk, and is often against the platform's terms. Silestis never asks you to download: it works with the audio on the page you already have access to. The audio is processed privately in the EU and deleted after transcription — never used to train AI. Prefer not to install the extension? You can also paste the link into the web app.
Ask follow-up questions
A summary is the start. Ask "what were the three main arguments?" or "what did they say about pricing?" and get an answer with clickable [mm:ss] timestamps that jump to the exact moment — so you can verify it in the video, not just trust it.
See it for YouTube videos, or how Silestis compares to Google NotebookLM.
FAQ
Do I need to download the YouTube video first?
No. Silestis works with the audio on the page you're already watching — no download, no copy-paste. The audio is processed privately in the EU and deleted after transcription.
What if the video has no captions?
It still works. If captions exist, Silestis can use them for a near-instant result; if not, it transcribes the audio with your chosen AI model in about 30 seconds per hour.
Is it free?
Yes, there's a free tier so you can summarize a few videos before choosing a plan. No credit card required.
The next lecture your AI tools can't open — Silestis can.
Open the video, click Silestis, done — a summary, timestamped answers, and notes, right on the page. Even when there's no transcript.
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