Video to MP3 Converter
Extract the audio from MP4, MOV, WebM or MKV as MP3. Runs in your browser.
About this video to mp3 converter
This video to MP3 converter pulls the soundtrack out of an MP4, MOV, WebM or MKV file and saves it as MP3, M4A, Opus or WAV. It is for anyone who wants the audio from a lecture, a podcast recording, a music video or a voice memo that was shot as video.
Everything happens in your browser. The video is never uploaded, so a 2 GB screen recording is as quick to start as a 20 MB phone clip, and there is no queue and no size cap beyond your device's memory.
You get the controls that usually sit behind a paywall or a second tool: a bitrate in CBR or VBR, mono or stereo, peak normalization, a trim range per file, title and artist tags, and batch conversion with one ZIP at the end.
Features
MP3 encoded by LAME
MP3s come from LAME 3.100, the encoder most audio software uses, compiled to WebAssembly. Choose a constant bitrate from 96 to 320 kbps or a VBR preset from V0 to V6.
M4A, Opus and WAV too
M4A (AAC) and Opus use your browser's built-in audio encoder, so they appear only where the browser supports them. WAV is plain 16-bit PCM and works everywhere.
Trim before you convert
Open Trim on any file to watch it, drag two handles or type exact times like 1:15.5. Only that range is decoded and encoded, which also makes it faster.
Normalize volume
Quiet phone recordings come out at a usable level. The tool finds the loudest sample in your range and scales everything so that peak sits at −1 dBFS.
Tags that players read
Set a title per file and one artist for the batch. They are written as ID3 tags in MP3, iTunes tags in M4A, Vorbis comments in Opus and an INFO chunk in WAV.
Batch with a ZIP
Drop in a folder's worth of clips. Each row shows its length, audio codec and an estimated output size, converts in turn, and has its own preview player.
How to use the video to mp3 converter
- 1Add one or more videos. Each file shows its length and audio track.
- 2Pick MP3, M4A, Opus or WAV, the bitrate and channels, and trim or tag a file if you like.
- 3Convert, listen to the result, then download each file or all of them as a ZIP.
When to use it
Lectures and talks for your commute
Turn a 90-minute recorded class into a 50 MB MP3 at 64 to 96 kbps mono. Speech doesn't need more, and the file fits easily on any phone.
Music from your own videos
Grab the song from a concert clip you filmed, trim off the crowd noise at each end, then cut a 30-second ringtone from the MP3.
Interview and meeting notes
Extract the audio as a small file, then turn the recording into a transcript without sending anything to a server.
Editing in an audio app
Pick WAV when the audio is going into an editor. It skips a lossy step, so nothing degrades before you start cutting.
Does converting MP4 to MP3 lose quality?
A little. The audio inside most videos is already compressed, usually as AAC. Converting it to MP3 decodes that AAC and encodes it again, and every lossy encode throws some detail away. At 192 kbps or more, most listeners can't tell the copy from the original on ordinary headphones.
What conversion can't do is add quality. If the video carries 128 kbps AAC, a 320 kbps MP3 of it is bigger, not better. Match or slightly exceed the source bitrate, which the tool shows for each file, and stop there.
If you need zero loss, choose WAV. It is uncompressed, so the only change is the decode itself.
Which bitrate should I choose: 128, 192 or 320 kbps?
Bitrate sets file size directly. MP3 at 128 kbps uses about 0.96 MB per minute, 192 kbps about 1.44 MB and 320 kbps about 2.4 MB. A 4-minute song at 192 kbps is roughly 5.8 MB.
- 64 to 96 kbps mono: speech, lectures, audiobooks.
- 128 kbps: podcasts and casual listening.
- 192 kbps or VBR V2: music. A good default when you're unsure.
- 256 to 320 kbps or V0: archiving music you care about.
- Opus at 96 kbps sounds close to MP3 at 160 to 192 kbps, at about half the size.
MP3 vs M4A vs Opus vs WAV
MP3 (MPEG-1 Audio Layer III, ISO/IEC 11172-3) plays on everything made in the last 25 years, from car stereos to smart TVs. That compatibility is why it's still the default.
M4A holds AAC audio, the same codec as most video soundtracks. It sounds better than MP3 at the same bitrate and is the native format for iPhone and iTunes. Opus (RFC 6716) is newer and more efficient still, especially for speech, but some older players and car systems don't support it. WAV is uncompressed, about 10 MB per minute for CD-quality stereo.
How the conversion works in your browser
The page reads the video's container directly from your disk with Mediabunny, which understands MP4, MOV, WebM and MKV. It reads only the audio packets and skips the video data entirely, so a big file doesn't load into memory. Your browser's WebCodecs AudioDecoder turns those packets into raw samples, and the chosen encoder writes the new file.
Why use Mavros
| Mavros | Typical upload sites | |
|---|---|---|
| Upload required | No, runs on your device | Yes, every file goes to a server |
| File size limit | Only your device's memory | 50 MB to 1 GB on free plans |
| Bitrate and VBR control | 96 to 320 kbps CBR or V0 to V6 | Often fixed or hidden |
| Trim range | Per file, with exact times | Separate tool or missing |
| Volume normalization | Peak to −1 dB | Manual volume at best |
| Title and artist tags | Yes, for every format | Rare |
| Batch with ZIP | Yes | Sometimes, often paid |
Tips
- Set Channels to Mono for speech. It halves the size of WAV and lets MP3 spend its bits on one channel instead of two.
- Normalize is a peak normalizer, not a compressor. A recording with one loud bang will barely get louder; trim the bang out first.
- Typing 90, 1:30 or 1m30s in a time box all mean the same thing. Arrow up and down nudge by 0.1 s, with Shift by a full second.
- Need the video too, just shorter? Trim the video itself instead and keep both picture and sound.
Questions
How do I convert a video to MP3?
Add the video, keep MP3 selected, pick a bitrate and press Convert. Then press Download. For several videos, add them all and download one ZIP.
Does converting MP4 to MP3 lose quality?
Slightly, because the audio is decoded and re-encoded. At 192 kbps or higher the difference is hard to hear. Choose WAV if you need no further loss.
Will a 320 kbps MP3 sound better than the original video?
No. Conversion can't restore detail the original encoder removed. Pick a bitrate near the source's, which each file row shows, and save space.
Is my video uploaded anywhere?
No. Decoding and encoding run in your browser tab. The only download is the 130 KB MP3 encoder, fetched once from this site and then cached.
Is there a file size limit?
There is no fixed limit. The audio is read in small pieces, so multi-gigabyte videos work in Chrome, Edge and Firefox. Older Safari decodes the whole file at once and may struggle past a few hundred megabytes.
Can I extract audio from a YouTube link?
No. This tool converts video files you already have on your device. It doesn't download from websites, and downloading from YouTube is against its terms.
Why are M4A or Opus greyed out with a warning?
Those use your browser's built-in encoder, and not every browser offers AAC or Opus to web pages. Firefox generally lacks AAC, for example. MP3 and WAV work in every browser.
Can I convert only part of a video?
Yes. Press Trim on the file, then drag the handles, type the times or use Start at playhead while watching. Only that range is converted.
Does it work on iPhone and Android?
Yes, in Safari on iOS 17 or later and in Chrome on Android. Phones are slower than laptops, so long videos take longer, and the screen should stay on.