Free tool
Lecture transcription
Drop a recorded class here for free lecture transcription: you get what the lecturer said as text, with a time beside every paragraph, so you can build study notes and jump back to any part you missed.
- Free
- Times to find any point
- Nothing is stored
Drop your lecture recording here, or Choose your lecture recording
MP3, M4A, WAV, AAC, FLAC, OGG or WebM. Up to 30 minutes of each file, 3 free files a day. The language is detected automatically.
Recording every class? NoteOwl records lectures on your Mac, transcribes them with unlimited transcription and turns each one into study notes.
How it works
How do you transcribe a lecture?
Choose the lecture recording or the class video. The converter finds the pauses in the lecturer’s speech, cuts the sound there and turns each piece into text, which appears with its time while you watch. Then download it and build your revision from it.
- 1
Find the recording
An M4A from your phone, a recording made on your laptop, or the MP4 your course page lets you download. Only the sound is used.
- 2
Let it write the text
The first 30 minutes of each file are transcribed, and the page tells you when a class ran longer. Every paragraph opens with its time.
- 3
Keep it for revision
Save a Word file to annotate, or subtitles to rewatch the lecture video with captions.
Why do lecture recordings come out with gaps?
Mostly distance. A phone on a desk in row ten hears the hall’s echo almost as loudly as the lecturer, who also turns to the board and walks away from the lectern. Speech blurred by echo is where words get skipped or misheard.
Echo in big halls
Hard walls send the voice back a fraction of a second later, smearing syllables together. The farther away the phone sits, the more echo it hears.
Questions from the room
A student three rows behind you may never reach the microphone. Only what your phone heard can end up in the text.
Projector and air-con hum
Hum on its own is skipped, because stretches with no speech aren’t sent. Under the lecturer’s voice it stays, and costs some clarity.
Course vocabulary
Technical terms, foreign names and formulas read aloud are spelled the way they sound. Check them against the slides.
“As you can see here”
Pointing at a slide makes sense only beside the slide. Jot slide numbers next to the times as you revise.
Where should you put your phone to record a class?
As near the lecturer as you can: the front row, facing the lectern. In a hall with loudspeakers, a seat under one also works, because it carries the lecturer’s microphone into the room. Far back, echo wins and the lecture to text comes out patchy.
On an iPhone, Voice Memos can filter out background sound: while the app is on screen, open Control Center, tap Voice Memos at the top and choose Voice Isolation. Don’t play a video during the class, though. Apple notes that Voice Memos stops recording when another app starts playing sound.
- 1
Microphone towards the lectern
Point the bottom edge of the phone at the lecturer, not at the ceiling or at your notebook.
- 2
Off the desk you write on
Typing, pens and bags on the same surface travel straight into the microphone. A folded jumper under the phone soaks them up.
- 3
A new file at each break
Stop and start a fresh recording when the class pauses, so each file stays a manageable length.
What if the lecture is longer than 30 minutes?
The converter transcribes the first 30 minutes and notes the full length above the text. For the rest, cut the recording into parts and transcribe each one. Every part’s times start again at 0:00, so write down where each part began.
Voice Memos on an iPhone can cut the parts for you: tap the recording, tap More, then Trim. Drag the yellow handles around the first part, tap Trim, then Apply and Done, and choose Save as New Recording so the full lecture stays as it was. Repeat for each part, then export them to Files.
How do you turn a lecture transcript into study notes?
Read it once with the slides open and break it into topics wherever the lecturer moves on. Under each topic, keep the definitions, the worked examples and anything flagged for the exam, with the time beside each so you can replay it.
For a layout built for revision, try the Cornell method, or start from a lecture notes template.
- “Moving on…” or “Next, …”
- It usually marksA new topic: start a new heading
- “We define X as…”
- It usually marksA definition worth copying word for word
- “For example…” or “Imagine…”
- It usually marksA worked example to keep with its topic
- “This comes up a lot”
- It usually marksA hint about what the exam will ask
- “Any questions?”
- It usually marksThe end of a section, often followed by a useful clarification
| When the lecturer says… | It usually marks |
|---|---|
| “Moving on…” or “Next, …” | A new topic: start a new heading |
| “We define X as…” | A definition worth copying word for word |
| “For example…” or “Imagine…” | A worked example to keep with its topic |
| “This comes up a lot” | A hint about what the exam will ask |
| “Any questions?” | The end of a section, often followed by a useful clarification |
Want every class turned into text and notes on your Mac?
NoteOwl records a lecture on your Mac, in the room or online, or imports one you already have, and transcribes it there with unlimited transcription. Its Student Lecture template turns the transcript into study notes. Nothing is uploaded. See how students use it.
Got a folder of old recordings? Here’s how to turn a lecture recording into notes on a Mac.
FAQ
Questions about lecture transcription
Is this lecture transcription free?
Yes, with no account. You can transcribe 3 recordings a day, up to 30 minutes of each, and every download, from a Word file to subtitles, is included.
Can it transcribe a lecture video from my course page?
Yes, once the video is on your device. Drop the MP4 or MOV on the converter: a current browser reads it a slice at a time, so even a large lecture video works, and the picture is ignored.
Will it get technical terms and formulas right?
Everyday vocabulary, yes. Rare names, jargon and symbols are spelled as they sound, and an equation read aloud is written the way it was spoken. Keep the slides beside you while you check those passages.
Does it pick up students’ questions?
Only what the microphone heard. A question asked near your phone is transcribed like the rest of the class; one from across the hall may be faint or missing. Lecturers who repeat each question before answering make the transcript complete.
Can I add captions to a recorded lecture?
Yes. Download the transcript as VTT for most course platforms and web players, or SRT for video editors and YouTube. Each caption carries its start and end time, so it lines up with the lecture video.
What if the lecture is in another language?
The converter detects the language by itself, about every 30 seconds, and names the main one when it finishes. For a class taught entirely in one language, that language’s own audio to text page sets it from the start.
Is my lecture recording kept anywhere?
No. While it works, the page sends short stretches of the sound to a cloud AI transcription service, which turns each into text and then discards it. NoteOwl holds on to neither the audio nor the transcript, so save your copy before you leave.
Keep exploring
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Related
- Lecture recorderRecord lectures in the room through your Mac’s microphone, in an online class with no bot, or from a file, then turn them into study notes
- Lecture recording to notesHow to transcribe a recorded lecture on a Mac and turn it into study notes, with NoteOwl or with Voice Memos’ free transcript
- StudentsLectures recorded in the room or an online class, or imported, turned into study notes you can ask questions of before the exam; dictating essays is free
Lectures into study notes, privately on your Mac
Free to download. Runs entirely on your Mac.
macOS 26 or later · Apple Silicon (M1 or newer) · 16 GB memory minimum, 24 GB recommended
About NoteOwl
NoteOwl is private AI meeting notes and memory for the Mac. It captures meetings without a bot joining the call, labels every speaker, writes summaries and action items, and builds a memory of every conversation that you can chat with — fully offline, because the speech recognition and the AI run on the Mac itself. Dictation into any app is free; Pro is a one-time purchase.
NoteOwl pricing: what’s free and what Pro adds
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