MP4 to MP3
Extract audio from any video and save as MP3.
First use downloads FFmpeg (~30 MB). It's cached after that.
About this tool
The MP4 to MP3 tool extracts the audio track from any video and saves it as an MP3 file, entirely within your browser without any uploads. Processing uses ffmpeg.wasm and runs on your device — no data is transmitted at any point.
To use it, select your video, choose the output MP3 bitrate (128 kbps for smaller files, 192 kbps for standard quality, or 320 kbps for maximum fidelity), and click extract. The process takes a few seconds to a few minutes depending on file size and your hardware.
Practical use cases include: extracting the soundtrack from a music video to listen offline, saving a recorded lecture or webinar as a podcast-style audio file for commuting, converting recorded meeting videos into audio files for transcription, or isolating music from concerts or live performances captured on video.
The quality of the output audio is bounded by the quality of the original audio in the video. Choosing a higher MP3 bitrate will not improve audio that was already recorded at low quality — it only better preserves what is already in the source file.
Frequently asked questions
Is my video uploaded to any server during extraction?
No. The entire process happens locally in the browser with ffmpeg.wasm. No file is transmitted.
Is the tool free?
Yes, completely free, with no usage limits and no account required.
Does it work on mobile?
Yes, on modern browsers for Android and iOS. For large files, prefer using a desktop computer for faster processing.
Which bitrate should I choose?
128 kbps is fine for voice content (podcasts, lectures). 192 kbps is the standard for music at good quality. 320 kbps gives maximum fidelity for high-quality audio sources.
Does it only accept MP4 files?
No. Any video format supported by your browser works: MP4, WebM, MOV, MKV, AVI. The tool name reflects the most common use case, not a technical limitation.