How to Extract Audio From a Video and Save It as MP3
You recorded a talk on your phone and only need the audio for a podcast. A family video has a grandparent singing and you'd like that on its own. Your lecture recordings are videos of a static slide, and you want to listen on a walk. Video to MP3 pulls out the soundtrack and saves it as an MP3.
Steps
- Open an MP4, MOV, WebM or MKV file.
- Set the start and end by dragging the handles, or type times like
1:05.5. - Choose a bitrate, and stereo or mono.
- Press Save MP3 and download.
The MP3 is exactly the span you selected, so you can pull out one song from a concert video or one answer from an interview.
Picking a bitrate
Bitrates run from 64 kbps up to 320 kbps:
- 64 kbps mono: voice notes, lectures, meetings. Small files, perfectly clear speech.
- 128 kbps: podcasts and general listening.
- 192–320 kbps: music, where you want it to sound like the original.
Mono halves the data and is the right call for a single speaker.
Under the hood
The browser's own audio decoder reads the soundtrack, and the MP3 is encoded with LAME, the long-standing open-source MP3 encoder (loaded via lamejs 1.2.1, an LGPL library, the first time you save). A few technical details the page handles for you:
- Surround sound is mixed down to stereo or mono.
- Sample rates MP3 doesn't support are moved up to the next one LAME accepts, and anything above 48 kHz is saved at 44.1 or 48 kHz.
- MP3 caps the bitrate at low sample rates, so a phone call recorded at 8 or 16 kHz will save at 64 kbps or below even if you chose more. The page tells you when that happens.
Which videos work
MP4, MOV, WebM and MKV, plus whatever other containers your browser can read. The audio inside needs a codec your browser can decode, such as AAC, Opus or MP3. Almost all phone and camera videos qualify.
Example: a lecture for your commute
A 90-minute recorded lecture as a 1 GB MP4. Trim off the five minutes of setup at the start, choose 64 kbps mono, save. You get an MP3 of roughly 40 MB that plays on anything and doesn't eat your phone storage.
Tips
- For trimming within the audio afterwards (removing a cough or a long pause), use MP3 cutter.
- Name the file sensibly before it disappears into Downloads: "2026-10-lecture-week3.mp3" beats "audio (14).mp3".
- Respect copyright: extracting audio from videos you own or have permission to use is fine; ripping other people's music for redistribution isn't.
Why not just play the video?
Video files are big, drain the battery faster, and many music and podcast apps won't play them in the background with the screen off. An MP3 is a fraction of the size, works in every audio player, car stereo and smart speaker, and can be added to a playlist. For anything you mostly listen to, audio alone is simply more practical.
Privacy
According to the page, everything runs in the page and the MP3 is saved on your device when you download it. The LAME encoder file is fetched the first time you save. Google ads appear on the page, as on the rest of the site.
FAQ
Which videos can I open? MP4, MOV, WebM, MKV and others your browser reads, with audio in a codec it can decode.
Why is my bitrate lower than I chose? Low sample-rate recordings cap MP3 bitrate. The page says when that happens.
Can I keep just one part? Yes, set start and end times.
Where does the encoder come from? LAME via lamejs 1.2.1, loaded on first save.
Want the audio, not the video? Video to MP3 extracts it in your browser.
— Alok Kumar Singh