Convert MP4 to MP3
Pull the audio out of a video as MP3 or lossless-copy M4A.
Runs on your device — never uploaded
Drop a file here or click to browse
Accepts .mp4, .mov, .webm, .mkv, .avi, .m4v. Nothing is uploaded.
How to convert MP4 to MP3
- Add a video
Drop the file whose audio you want.
- Choose the output
MP3 at 128–320 kbps, or copy the original AAC track without re-encoding.
- Download
Listen to the preview, then save.
Frequently asked questions
Is my video uploaded?
No. FFmpeg runs as WebAssembly inside your browser tab. Nothing leaves your device.
Why does the tool take a moment to start?
The FFmpeg engine (~30 MB) downloads once on first use and is then cached on your device for instant starts later.
Will the audio quality drop?
MP3 re-encoding is lossy but transparent at 192 kbps and above. Choose "copy original" to keep the exact audio stream.