Does converting MP4 to MP3 lose quality?

Slightly, since both formats are lossy and re-encoding discards a little more data. At 192kbps or above the difference is inaudible to almost everyone on normal playback equipment.

Can I convert several MP4 files at once?

Not currently. Files are converted one at a time to keep browser memory use predictable. Convert one, download it, then load the next.

How long does an MP4 to MP3 conversion take?

A 4-minute video usually finishes in 5–10 seconds after the engine has loaded. Longer files scale roughly linearly with duration.

Will this work on my iPhone or Android phone?

Yes. Mobile Safari and Chrome both support the required WebAssembly features. Very large files may hit memory limits sooner on mobile.

Can I convert MP3 back to MP4?

Not with this tool, since that requires generating video content. Converting back would also not recover the original video.

Is it legal to convert MP4 to MP3?

Converting files you own or have permission to use is fine. Converting material you don't hold rights to may not be, depending on your jurisdiction.

MP4 → MP3

MP4 to MP3 Converter

Drop a file here

Click to browse, or paste a file from the clipboard.

Choose file

An MP4 to MP3 converter extracts the audio track from a video file and saves it as a standalone audio file. Choose a bitrate, convert, and download — the whole process takes a few seconds for most files.

How to convert MP4 to MP3

Drop your MP4 file onto the box above, or click to browse your device.
Pick an audio bitrate — 192kbps suits speech and most music.
Press Convert and wait for the progress bar to finish.
Download your MP3. The file saves directly to your device.

Why convert MP4 to MP3?

MP4 is a video container, so every MP4 carries a video stream alongside its audio — even when you only care about the sound. Stripping the video out typically cuts file size by 85–95%, which matters when you're moving a recorded lecture, interview, or podcast onto a phone or an audio-only player.

The other common reason is playback compatibility. Car stereos, older MP3 players, DAWs, and podcast tools frequently accept MP3 but not MP4. Converting removes that friction entirely.

If you want to keep the picture, compress the video instead. To pull just the soundtrack as its own job, extract audio.

MP4 vs MP3: what's the difference?

	MP4	MP3
Type	Video container	Audio format
Contains	Video + audio + subtitles	Audio only
Typical size (4 min)	40–80 MB	4–8 MB
Compression	Lossy (H.264/AAC)	Lossy
Device support	Very broad	Near universal
Best for	Video playback	Music, podcasts, voice

MP3 is a lossy audio format that discards frequency data most listeners cannot hear in order to reduce file size.

Which bitrate should you choose?

Bitrate sets how much data each second of audio uses. 128kbps is adequate for spoken word and produces the smallest files. 192kbps is the practical sweet spot for music and the default here. 320kbps is the maximum MP3 allows and is worth using only when your source audio is genuinely high quality.

One caveat: converting cannot add quality that was never there. If your MP4's audio is 128kbps AAC, exporting at 320kbps MP3 produces a bigger file with no audible gain.

Frequently asked questions

Does converting MP4 to MP3 lose quality?: Slightly, since both formats are lossy and re-encoding discards a little more data. At 192kbps or above the difference is inaudible to almost everyone on normal playback equipment.
Can I convert several MP4 files at once?: Not currently. Files are converted one at a time to keep browser memory use predictable. Convert one, download it, then load the next.
How long does an MP4 to MP3 conversion take?: A 4-minute video usually finishes in 5–10 seconds after the engine has loaded. Longer files scale roughly linearly with duration.
Will this work on my iPhone or Android phone?: Yes. Mobile Safari and Chrome both support the required WebAssembly features. Very large files may hit memory limits sooner on mobile.
Can I convert MP3 back to MP4?: Not with this tool, since that requires generating video content. Converting back would also not recover the original video.
Is it legal to convert MP4 to MP3?: Converting files you own or have permission to use is fine. Converting material you don't hold rights to may not be, depending on your jurisdiction.