Extract Audio from MP4 — Convert to MP3
Extract the audio track from any MP4 video and save it as an MP3 file. Fast, browser-based, no software needed.
Converting your file…
How MP4 → MP3 conversion works
MP4 is a container format — it holds one or more streams (video, audio, subtitles). This tool extracts the audio stream (typically AAC or AC3 in MP4 files) and re-encodes it as MP3 using the LAME encoder. The video track is discarded. The result is an audio-only MP3 file. If the source audio is already high quality (e.g., 320kbps AAC), the output MP3 will be close in quality. If the source audio is low bitrate, the MP3 will reflect that ceiling.
Limitations
- Output MP3 quality is capped by the source audio quality in the MP4.
- If the MP4 has multiple audio tracks, only the first (default) track is extracted.
- Very large video files (>500MB) may take longer to process.
When to use this conversion
- Extracting music or interviews from video recordings.
- Saving the audio from a downloaded video lecture or podcast in video format.
- Creating an audio-only version of a video for listening on the go.
Alternatives to consider
- /convert/audio/mp3-to-wav — convert the extracted MP3 to uncompressed WAV for editing.
- /convert/video/mp4-to-avi — keep the full video in a different container format.
Frequently asked questions
Will the video be deleted?
Yes — this tool extracts audio only. The output is an MP3 file with no video track.
What if my MP4 has no audio?
The conversion will fail. Silent video files (screen recordings without narration, for example) contain no audio stream to extract.
Can I choose the output bitrate?
Yes — use the quality option to select 128kbps (smaller), 192kbps (balanced), or 320kbps (highest quality).