AI lecture summarizer: from a lecture recording to key points and notes

Three kinds of lecture the summarizer accepts

The source decides only one thing, the price: a captioned YouTube course is free, a file is transcribed for minutes.

File formats and size limits are the same as for any upload: see the guides to transcribing a video file and to converting an audio recording to text. Without an account a file can be up to 100 MB; after sign-in, up to 500 MB and 4 hours.

From a lecture recording to notes in four steps

Summarizing a recorded lecture takes four steps, and only the last one involves AI writing.

1. Get the recording. Download the class from your course portal where the lecturer allows it, export it from Zoom, or copy the audio file off your phone. A YouTube course needs only the link.
2. Drop it on the page. Put the file into the upload area at the top, or paste the YouTube address into the field above it.
3. Let the transcript finish. Speech recognition reports progress as minutes done out of the total, so a 90-minute class shows where it stands.
4. Press Summary or Detailed notes. Summary gives 5–7 key points; Detailed notes give every topic of the class with the facts and names under it.

For revision, Detailed notes is usually the better tile: it keeps definitions, dates and formulas the lecturer says aloud, while Summary keeps only the main argument. The guide to turning video into study notes shows what such an outline looks like. Choosing between those two outputs is the main difference between an AI lecture summarizer and a plain transcription service.

Long lectures and a whole course

A long session is summarized end to end, because the transcript is condensed in parts before the summary is written.

• A 3-hour seminar fits in one file after sign-in; the 4-hour cap applies to each upload.
• A double session recorded as two files is handled as two separate uploads, each with its own notes.
• A course of 12 lectures of 90 minutes is 18 hours of recordings, which fits into the 30-hour pack at $58.99.
• On YouTube, a captioned course playlist costs nothing at any length: open each video by its link.

Lecture transcription, word for word

Every summary starts from a full lecture transcription, and that text is yours to keep, with a timestamp on each line.

Transcribing lectures word for word helps when a quote matters: the exact definition before an exam, a citation for an essay, or an accessible copy of the class for a student who is deaf or hard of hearing. The transcript downloads as TXT or Markdown for reading and as SRT or VTT for captions. Pro Transcript, one of the AI tiles, returns the same text as clean paragraphs with filler words and false starts removed.

Teachers use the same route the other way round: a recorded class becomes a one-page handout of key points for students who missed it, and the SRT file becomes captions on the course video.

Recording a lecture so it summarizes well

Distance from the speaker matters more than the device: a phone on the front desk captures more than a laptop at the back of a hall.

• Ask the lecturer first; many universities set rules on recording classes.
• Put the phone on a desk rather than in your hand, so handling noise stays out.
• Questions from the audience are often too quiet to transcribe; they come through when the lecturer repeats them.
• Keep one file per class, so each gets its own summary.

To record lectures and turn them into notes, use any recorder app and upload the file afterwards: the site itself does not record.

What’s free and what uses minutes

A captioned YouTube course is summarized free with no sign-up; a recording of your own uses one minute of balance per minute of audio, from $0.033.

• First recording: free with no account, in full up to 10 minutes, the first 10 minutes of a longer one.
• Sign-up gift: 10 minutes of transcription, enough for a short seminar.
• After transcription: summary, notes, Pro Transcript and a chat about the class are included.
• Free AI on captioned videos may pause until the next day on a day of very high demand.

What the lecture summarizer doesn’t do

The lecture summarizer works from what is said, so equations on the board and text on slides reach the notes only when the lecturer reads them out.

• No recording in the browser and no live summary during class.
• No links from Canvas, Moodle, Panopto or Google Drive; download the file first.
• No labels for who is speaking in a seminar discussion.
• No flashcards or quiz tiles yet; a custom prompt can write revision questions as text.

Other ways to use the same transcript, from an article to a chat, are listed on the page about summarizing video with AI.

Frequently asked questions

Is the lecture summarizer free?

Yes for a lecture on YouTube with captions: the summary, the notes and every other AI action are free, with no sign-up. A recording of your own is transcribed first, from $0.033 per minute; your first one is free up to 10 minutes.

Do I need an account?

No for captioned YouTube lectures and for your first recording. Whole recordings after that need sign-in, done through a link sent to your email.

Can it summarize a three-hour lecture?

Yes. After sign-in a file can be up to 500 MB and 4 hours long, and the transcript is condensed in parts, so the summary covers the full session.

Is my recording kept on your server?

No. The original file is deleted once its sound has been extracted, and the sound pieces are deleted after recognition. The transcript and notes stay in your browser, or in your account after sign-in.

Can it record the class for me?

No. There is no microphone recording on the site; record with your phone’s voice recorder or a dictaphone and upload the file afterwards.

Will it summarize a lecture given in another language?

Yes. The summary comes in the language of the lecture; for English notes from a Spanish talk, pick English in the language menu first. The author’s own translations are free, other languages go through AI translation paid with minutes from your balance.