🎌 Samuraize
Summarize lecture videos into notes you can actually study from
Click to switch summarizer Summarizer
Paste a YouTube link and Samuraize carves it into a short, bite-sized document of its key points — no need to watch the whole thing.
A 90-minute recorded lecture is a wall of talking. Samuraize reads the transcript and rewrites it as titled sections - definitions, arguments, examples, what the professor said would be on the exam - each linked to the moment in the video it came from. Paste a link above to try it - three summaries are free without an account, and a free account gives you 20 Samurai Coins a month (1 coin per 10 minutes of video).
Built for lectures, not just any video
Lecture summaries are written as revision notes: key terms are named, each concept gets its own section, and worked examples are kept rather than dropped. The detail slider decides how much survives - 10% for a quick recap before class, up to 50% for a full set of notes you can revise from.
Timestamps take you back to the explanation
Every section carries a ▶ m:ss chip. When a summary line isn't enough, click it and the video opens at exactly that point, so you re-watch the two minutes you need instead of scrubbing through an hour.
Then turn the notes into flashcards and a quiz
Every saved summary can generate flashcards and a multiple-choice quiz from the actual lecture content, and you can ask questions about the lecture in plain language - answers cite the timestamp they came from. That turns one recording into a complete revision kit.
Works with long recordings and other languages
Multi-hour lectures are split into parts and stitched back together, so length isn't a limit. Lectures in Turkish, Spanish, German, French and ten more languages can be summarized in their own language or translated into yours.
Frequently asked
- Does the lecture have to be on YouTube?
- For video, yes - Samuraize reads YouTube's transcript. If your lecture is a PDF of slides or a PowerPoint file, use the PDF or PPT summarizer instead; they work the same way.
- What if the lecture has no captions?
- Most recorded lectures have auto-generated captions. If a video has none, we tell you straight away and nothing is counted against your quota.
- Can I summarize a whole course?
- On Premium or Maximum you can paste a channel or playlist owner's channel, tick up to 10 lectures and summarize them in one go. Each one is saved to your library with search.
- Is it free?
- Three summaries are free with no account, a free account gets 20 Samurai Coins a month (and 25 more per friend you invite), and Premium ($4.99/month) gives 200. Coins are charged by length: one buys 10 pages of PDF or 10 minutes of video, and you see the price before each summary. Asking a question about a summary is 1 coin; a deck of flashcards or a quiz is 2, on every plan.