Convert MP4 to MP3
Pull the audio track out of your MP4 video and download it as MP3, with the conversion running entirely in your browser (ffmpeg).
Your files never leave your device
How to convert MP4 to MP3
- 1
Upload the MP4
The video stays in your browser.
- 2
Convert
ffmpeg extracts the audio track to MP3 (~190 kbps VBR).
- 3
Listen and download
Preview the result before saving.
Why use this tool
Audio only
Music, podcasts or talks from a video, without the video weight.
High quality
MP3 VBR ~190 kbps: transparent to most ears.
Private
The file never leaves your device: ffmpeg runs in your browser.
Real engine
ffmpeg, the industry standard, compiled to WebAssembly and self-hosted.
Frequently asked questions
Why does the first conversion take a moment to start?
On first use the ffmpeg engine (about 32 MB) is downloaded from this same site; it stays cached afterwards. The conversion itself depends on video length and your hardware.
What MP3 quality do I get?
LAME VBR quality 2 (~170-210 kbps), the sweet spot between size and fidelity.
Is there a size limit?
The site-wide limit is 250 MB per file, and above 100 MB we warn it may be slow: everything is processed in your browser memory.
Does it work with other video formats?
This tool also accepts MOV, WEBM or MKV. There is also the generic Extract audio from video tool.