Ask questions about YouTube videos
Open any video and click Silestis — get a summary and timestamped answers right on the page. No downloads, no copy-paste, no scrubbing through hours of video.
Get answers and a summary in about 30 seconds
Open a YouTube video and click the Silestis extension while watching — or paste the URL. Silestis grabs the audio and gives you a summary, timestamped answers, and an accurate transcript underneath; a one-hour video is typically ready in about 30 seconds. If the video already has captions, the caption fast-path can return text in seconds.
Then do more than read
- Search the transcript for any phrase and jump to the exact moment.
- Chat with the video — ask for the key takeaways and get answers with clickable [mm:ss] timestamps.
- Study with auto-generated notes, chapters, and flashcards.
- Export as TXT, SRT, VTT, PDF, or DOCX.
How it works
- Open the video in your browser, or copy its link.
- Click the Silestis extension or paste the URL, pick a model, and hit transcribe.
- Search, chat, and export when it's ready.
Also great for lectures and podcasts. See pricing or how we compare to NotebookLM.
YouTube videos — FAQ
How do I get a summary and answers from a YouTube video?
Open the video and click the Silestis browser extension, or paste the YouTube link. You get a summary, timestamped answers, and a full transcript — a one-hour video is typically ready in about 30 seconds, no downloading required.
Can I get a transcript without downloading the video?
Yes. Silestis fetches the audio for you. If the video already has captions, the caption fast-path can return a transcript in seconds; otherwise it transcribes the audio with your chosen AI model.
Can I ask questions about a YouTube video?
Yes. After transcription you can chat with the video — ask 'what were the key points?' and get an answer with clickable [mm:ss] timestamps that jump to the exact moment.
Which sites besides YouTube are supported?
1800+ sites including TikTok, Vimeo, Instagram, and SoundCloud. Paste a link from any of them.
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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