Ask questions about YouTube videos
Open a supported video and click Silestis — create a transcript, summary, and timestamped answers without manually downloading or copying captions.
Get answers and a searchable transcript
Open a supported YouTube video and click the Silestis extension while watching — or paste the URL. Silestis prepares a transcript and can add a summary and timestamped answers. If usable captions already exist, the caption fast-path can return text in seconds; AI transcription time varies by source, duration, selected mode, and load.
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 a supported video and click the Silestis browser extension, or paste its YouTube link. Silestis creates a transcript and can add a summary and timestamped answers. Processing time varies by source, duration, selected mode, and load.
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. When the selected mode provides timestamps, answers can include clickable [mm:ss] references back to the source.
Which sites besides YouTube are supported?
Silestis supports links from many services, including common video and audio platforms. Availability can change and depends on the source, permissions, player, and stream format.
Start from the supported lecture page you already use.
Open the video and click Silestis to start a transcript, summary, and notes workflow on the page. Timestamp-capable modes can also return cited answers, including when no source transcript exists.
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