Got a video but only want the sound — a lecture, a song, an interview, a podcast recording? Converting MP4 to MP3 extracts just the audio into a small file you can play anywhere. Here’s how to do it for free without uploading your video to a random server.
Why pull MP3 audio out of an MP4?
- Listen anywhere: music players, car stereos, and audio apps want MP3, not video.
- Much smaller: dropping the video track can cut the file size by 90% or more.
- Convenient: save a podcast or lecture for offline, audio-only listening.
Convert MP4 to MP3 in your browser
Uploading a big video file just to grab the audio is slow and not very private. With a client-side tool, the whole video stays on your device. Use the free MP4 to MP3 converter:
- Open the converter and add your MP4 (drag-and-drop works).
- Select MP3 and a bitrate — 192 kbps is the comfortable default.
- Click Convert. The tool drops the video track and encodes the audio locally.
- Download your MP3. No account, no watermark, nothing leaves your computer.
Does it work for other video formats?
Yes. The same tool handles MOV, WEBM, MKV, and AVI too — anything with an audio track. If you mainly want a different output (like M4A), just change the output format.
Tips for the best result
- Match the bitrate to the source: there’s no benefit going above the audio quality already in the video.
- For long videos (an hour or more), use a desktop browser — it has more memory than a phone.
- The first conversion downloads a small engine once, then it’s cached for next time.
Related tools
- Want a different output? The audio converter also makes WAV, M4A, OGG and more.
- Already have audio files? Convert WAV to MP3 or M4A to MP3.
- Need to join several clips first? See the audio merger.
Summary
To convert MP4 to MP3, open the in-browser converter, choose MP3 at 192 kbps, and download the extracted audio. It’s free, fast, and your video never leaves your device.