To record a lecture and turn it into notes, first ask the lecturer if you may record. Record the lecture on your phone (or, without permission, speak your own recap right after class). Then let an app transcribe the audio and structure it into notes: an overview, the key concepts and definitions, and questions to study from. Finally, check the notes against your slides and add what the recording missed. The recording is a backup for your own notes, not a replacement.
| Step | What you do | Time |
|---|---|---|
| 1. Ask | Ask the lecturer before class whether you may record | 1 minute |
| 2. Record | Record the lecture, or speak a recap right after class | During or after class |
| 3. Structure | Turn the audio into notes with key concepts and study questions | A few minutes |
| 4. Check | Compare with slides and your own notes, fix names, formulas and numbers | 10 minutes |
| 5. Review | Answer the study questions without looking, once a week | Weekly |
Ask before you record a lecture
Recording a lecture is not automatically allowed. Two things decide it: the law where you are, and the rules of your school or course.
- The law. In the US, federal law and many states allow recording a conversation when one person in it agrees; other states require everyone's consent. The Digital Media Law Project explains one-party and all-party consent and recommends getting everyone's consent when in doubt. A lecture hall is not a phone call, and other countries have their own rules.
- Your school. Many schools and instructors set their own rules on recording classes and on sharing recordings. Check the syllabus or ask.
Information, not legal advice
Ask the lecturer before class and record only if they say yes. If they say no, or you are not sure, do not record. Never post or share a lecture recording without permission, and remember that classmates who speak up are on the recording too.
No permission? Dictate your own notes. Right after class, while it is fresh, speak a two-minute recap into your phone: the topic, the three main ideas, any definitions, what will be on the exam, the homework. That is your own voice, and it turns into structured notes just as well. It also makes you recall the lecture, which is a study step in itself.
Record the lecture well
- Sit near the front and close to the lecturer or a speaker, away from the door and the air vent.
- Put the phone on the desk, screen down, microphone toward the lecturer. Do not hold it.
- Silence notifications and switch on airplane mode if you do not need the network while recording.
- Check storage and battery before a long lecture.
- Note the slide number when something important comes up. It makes checking the notes later much faster.
- Keep writing your own notes. The recording catches what you miss; your notes show what you understood.
Turn a lecture recording into notes with Retexta
Retexta is a cloud voice to text and AI writing app for Android. Its Lecture notes goal turns a lecture recording, or your own spoken recap, into structured notes.
- Open Retexta and tap New task.
- On What do you want to do?, tap More templates and choose Lecture notes.
- Under Add your input, choose how to start:
- Record audio: record the lecture (with permission) or speak your recap after class.
- Import audio: pick a recording you made with another app. Android's file picker opens and shows your audio files.
- Paste text: paste a transcript or notes you already have.
- Retexta transcribes the audio on its servers and structures it. The notes use sections such as Overview, Key Concepts, Definitions, Formulas & Equations, Homework & Tasks, Study Questions and References, depending on what the lecture contains.
- Under Make more of this lecture you can create a Clean transcript, Key concepts, Study questions or Homework & tasks, Share the notes or Export PDF. When you share or export, you choose whether to include only the lecture notes or the raw transcript too.
- Check the notes. Retexta marks AI results with "AI-generated. Check important details." Compare formulas, names, dates and numbers with the slides.
Lecture notes and Import audio are part of Retexta Pro. Retexta is free to try: new users get a few free Pro results to view in the app. Copying, sharing, exporting and screenshots need Retexta Pro or credits, and so does everything after the free results.
Study questions, not flashcards
The Lecture notes goal writes study questions. It does not make flashcards. If you study with a flashcard app, copy the questions over (copying needs Retexta Pro or credits) and write the answers yourself: that is where the learning happens.
Example: a spoken recap turned into lecture notes
We wrote this example ourselves to show the idea. It is not real app output, and your results will look different.
Spoken recap after class, as a plain transcript:
Okay, Intro to Economics, week three, supply and demand.
So he started with the law of demand, when the price goes up, people buy less, all else equal.
Law of supply is the other way round, higher price, sellers offer more.
Where the two curves cross is the equilibrium, that's the market price and quantity.
Then shifts, a shift of the curve is not the same as a movement along the curve, he said that's a classic exam mistake.
Example was concert tickets.
Homework, problem set two by Monday, and read chapter four.
As lecture notes:
Overview
Week 3, Intro to Economics: how supply and demand set a market price.
Key Concepts
- Law of demand: when the price rises, the quantity demanded falls (all else equal)
- Law of supply: when the price rises, the quantity supplied rises
- Equilibrium: the price and quantity where the supply and demand curves cross
- A shift of a curve is different from a movement along a curve (exam warning)
Definitions
- Quantity demanded: how much buyers want to buy at a given price
- Equilibrium price: the price at which quantity supplied equals quantity demanded
Study Questions
1. What does the law of demand say, and what does "all else equal" mean here?
2. How is the equilibrium price found?
3. What is the difference between a shift of the demand curve and a movement along it?
4. Using the concert ticket example, what happens to the price if demand rises?
Homework & Tasks
- Problem set 2, due Monday
- Read chapter 4
The recap took under a minute to say. The notes give you something to review, and the questions give you something to test yourself with.
How to study from lecture notes
- Same day: read the notes once and fix what is wrong or missing. Add slide numbers.
- Cover and answer: hide the notes and answer the study questions out loud. Mark the ones you could not answer.
- Weekly: go through all previous notes and questions again. Cornell University's Learning Strategies Center suggests spending at least ten minutes every week reviewing previous notes.
- Before the exam: combine the notes from each week into one summary and work through all the questions you marked.
For methods to take notes during the lecture itself, such as the Cornell system, read how to take notes in lectures.
Keep reading
Using AI for your studies without crossing academic integrity lines: voice to text for students. Recorded the lecture with another app? See how to transcribe a voice memo on Android. More about the app: Retexta, voice to text for Android.
Sources
Checked by FLAME Apps on September 25, 2026.
- Digital Media Law Project, Recording Phone Calls and Conversations: federal and state consent rules in the US.
- Cornell University Learning Strategies Center, The Cornell Note-taking System (PDF, adapted from Walter Pauk, How to Study in College): the weekly review step.
- Retexta: goal names, lecture note sections, actions and plans as shown in the app strings and on its Google Play listing.
