YouTube lecture to study notes with ChatGPT
The transcript comes with the prompt already on top: summary, key ideas or study questions.
Updated: September 2026 · 6 min read
To turn a YouTube lecture into study notes: install AppGrabbit, open the Transcript tab, paste the lecture link, pick the Study questions prompt (or Summary) and click Transcribe. You get a .txt that already starts with the prompt: paste the whole thing into ChatGPT, Claude or Gemini and get the notes, the questions with answers or the summary. If the lecture has no captions, the app transcribes it on your PC. Next to the .txt sits an .srt with the minutes, to jump back to the exact point. 1 credit · 5 free a month
Why copying YouTube's transcript panel doesn't work
You can open "Show transcript" under the video and copy. But it comes with a timestamp glued to every line, no punctuation, one long block; the AI digests it worse and you can't tell anything apart. A two-hour lecture is thousands of lines. And if the teacher never turned captions on, there is no panel at all. The extensions that "summarize videos" do the work in the cloud with their own model, and you don't control the result.
The method: a transcript with the prompt already on top
AppGrabbit leaves the clean text (no timestamps, no tags) in a file that starts with the instruction you picked. It doesn't summarize anything itself: your AI does, the one you already use, with whatever model you prefer. The difference from pasting loose text is that the prompt was written for a lecture and sits at the very top, so the AI reads it before the content.
The three prompts in the tab and what each is for
- Summary — "5 clear points with exact names and figures". To know what the lecture was about before deciding whether to study it in depth.
- Key ideas — "a list of ideas and the 3 most quotable sentences". For an essay or a presentation: separate ideas and exact sentences to quote.
- Study questions — "10 questions with answers, from basic to advanced". To review before an exam: quiz yourself and check against the answer.
- No prompt — just the text, to write your own instruction (flashcards, glossary, concept map).
Long lectures: how much text it is and how to paste it
One hour of lecture is about 9,000 words; two hours, about 18,000. Claude and Gemini take that in one go. If your AI says the text is too long, open the .srt, find the minute where the topic changes and paste the .txt in 30- or 40-minute blocks, with this instruction at the top of each block: "This is part 2 of 4 of the same lecture; keep a running outline and merge everything at the end".
Prompts for after the notes
With the text already in your AI, ask for more (copy as is)
- Flashcards — "Turn these notes into 20 question-and-answer cards, from the most basic to the hardest".
- Glossary — "List every technical term that appears, with a one-line definition and the approximate minute where it is explained".
- Exam — "Give me a 10-question multiple-choice exam on this lecture; don't show the answers until I reply".
- What I didn't get — "Explain the part about [topic] as if to a high-school student, with an everyday example".
With or without captions, and in which language
If the lecture has captions, the app takes them and the text is ready in seconds. If it doesn't (many recorded classes, conferences, live classes uploaded later), the app downloads only the audio and transcribes it on your PC with a speech-recognition engine; the first time it gets ready by itself. It detects the spoken language; if the lecture mixes English and Spanish you can fix it. A two-hour lecture takes about 6 minutes with an NVIDIA card or about 25 on the processor alone.
What to know, honestly
The AI sometimes makes things up: if a figure or a name sounds off, the .srt takes you to the exact minute to check against the video. YouTube's automatic captions get proper names and formulas wrong; for a math or chemistry lecture, check formulas against the board. And notes don't replace the lecture: they help you review what you already watched and find fast what you didn't understand.
Step by step
- 1Install AppGrabbit for Windows — Free installer (109 MB, everything included). Windows will say it protected your PC because the installer is not code-signed: More info › Run anyway.
- 2Open Transcript and paste the lecture link — The app reads the video and tells you whether it has captions or will be transcribed on your PC, and how long it will take.
- 3Pick the prompt — Study questions to review, Summary to know what it's about, Key ideas for an essay. It goes at the top of the file.
- 4Click Transcribe — The .txt and the .srt land in the Transcripts folder inside your downloads folder, and in the Library.
- 5Paste the whole .txt into your AI — ChatGPT, Claude or Gemini. If it's too long, in blocks using the minutes from the .srt. Save the reply as your notes.
Frequently asked questions
Each lecture is one transcript and costs 1 credit. For a course with many lectures, the 7-day pass (USD 3.99, no renewal) removes credits for a week.
Your AI does. The app hands you the clean text with the prompt on top; the summary, questions and flashcards come from ChatGPT, Claude or Gemini with your account.
The one you already use. For long lectures, Claude and Gemini take more text at once; with ChatGPT you sometimes have to paste in parts.
Yes: with any link the app can download, and also with a recording of your own (the Zoom mp4, the audio from your phone) by dropping it onto the Transcript tab.
The text comes out in that language. Ask your AI for the notes in yours in the same instruction: "answer in English".
1 credit per lecture. Free comes with 5 credits a month and, when you hit 0, you can claim 1 more every 48 hours. Pro (USD 8.99 a month) or the 7-day pass (USD 3.99) remove credits.
Related guides
From the lecture to your notes in five minutes
Windows 10/11 · 1 credit per lecture, 5 free a month · With or without captions