MP4 to MP3 Converter
Turn MP4 into MP3 in one click. Small files convert in your browser, bigger ones on our private server, deleted within the hour. No account, no watermark.
What this tool does
This MP4 to MP3 converter extracts the audio track from a video and encodes it as an MP3. Files up to 500 MB are converted entirely in your browser; larger files run on our private server: the uploaded original is deleted when the job ends, and the result within an hour of your download. Bitrate, sample rate, and channels are configurable, and Auto handles everything when you would rather not touch settings. Free, no account.
Works with MP4, MOV, WebM, and MKV videos up to 1 GB. The video needs an audio track; a silent file has nothing to extract.
How it works
- Add a video that contains audio.
- Leave Auto on, or pick on-device or cloud processing and set the audio quality.
- Convert and download the MP3.
Supported formats
| Supported formats | MP4, MOV, WEBM, MKV |
|---|---|
| MIME | video/mp4, video/quicktime, video/webm, video/x-matroska |
| Max file size | 1.0 GB |
When to use it
Save a soundtrack
Extract music from a video file and keep it as a standalone MP3.
Listen instead of watch
Turn lectures, interviews, and video podcasts into audio files for a phone or car player.
Playback everywhere
MP3 plays on effectively every device, so nothing bounces back as an unsupported format.
One input, one output
The page does a single job: take the audio out of a video and hand back an MP3. There is no timeline to learn and nothing required before the first conversion. The bitrate, sample rate, and channel controls are there for when you want them.
Files up to 500 MB are converted by the browser itself, so the video never leaves your device. Larger files upload over an encrypted connection and are converted on the private server: the uploaded original is deleted when the job ends, and the result within an hour of your download.
Because browsers cannot encode MP3 on their own, the page ships a small MP3 encoder that runs locally for on-device conversions. It is the same LAME encoder desktop software has used for decades, compiled to run in a tab.
Frequently asked questions
Why does this page load an extra engine?
Browsers cannot encode MP3 natively, so the page ships a small MP3 encoder for local conversions. It is the LAME encoder that desktop audio tools have used for decades, compiled to run inside the browser. Cloud conversions use a standard server-side encoder instead.
Which files can I convert?
MP4, MOV, WebM, and MKV videos up to 1 GB. The file must contain an audio track; a silent video has nothing to extract.
Where is my file processed?
Files up to 500 MB are converted by your browser. Larger files are converted on our private server; the uploaded original is deleted when the job ends and the result within an hour of your download. Neither path keeps a copy after that.
What bitrate should I pick for the MP3?
The default 160 kbps suits most music and voice recordings. Use 320 kbps for music you care about, or 128 kbps when file size matters more than fidelity.
Can I turn an MP3 back into a video?
Not here; this tool extracts audio only. The Video Converter can wrap an MP3 into a video file if you need the reverse.
Related tools
Privacy
Files up to 500 MB are processed on your device by default. Switch to Local mode to keep larger files on your device, or use Cloud mode to upload them. Cloud uploads are deleted when the job ends, and results within an hour of your download.
Platform and product names are used descriptively for reference only; LimkaKit is not affiliated with or endorsed by YouTube, Instagram, TikTok, Adobe, or Blackmagic Design.