MP4 to MP3 Converter
Convert MP4 video files to MP3 audio, right in your browser.
Private by design
Files are processed in your browser.
Free & no sign-up
No account, no email, no limits.
Fast
No upload wait — work starts instantly.
No watermarks
Clean output, every time.
MP4 is a video format, so it carries both picture and sound. When you only need the sound — a song, a talk, a recorded call — converting the MP4 to MP3 gives you a small audio file that plays on any device or music app.
This tool extracts the audio track from your MP4 and encodes it as an MP3 without uploading anything. The work is done locally in your browser, so even private recordings stay on your device.
How to use the mp4 to mp3
- 1
Add your MP4
Drag your MP4 file into the box, or click to choose it from your device.
- 2
Choose the quality
Pick the MP3 audio quality that fits how you'll listen.
- 3
Convert and download
Click Convert to MP3 and download your audio file instantly.
MP4 in, MP3 out
MP4 is a container: it holds a video stream and an audio stream side by side. Converting to MP3 pulls out the audio and writes it as a standalone file, leaving the pictures behind. That is why the output is dramatically smaller than the input and why the conversion is quick.
Everything happens in your browser. The MP4 is read from your disk, decoded in your device's memory and written back out as an MP3 download — nothing is uploaded, so there is no server-imposed size limit and no waiting behind other people's jobs.
Does converting lose quality?
Some, unavoidably. The audio inside an MP4 is usually AAC, which is already compressed. Writing it to MP3 means decoding and re-encoding, and each lossy encoding step discards a little detail. At 192 kbps or above the difference is inaudible in normal listening, which is why that is the default.
The rule of thumb: convert once, from the best source you have. Repeatedly converting the same audio between lossy formats compounds the loss.
Where it fits
- Any device with a music player
- MP3 plays on hardware that has never heard of anything newer — car stereos, old phones, gym equipment, cheap MP3 players.
- Editing and transcription
- Audio editors and transcription tools handle a small MP3 far more comfortably than a large video.
- Storage and sharing
- Sizes drop by an order of magnitude, which turns an unsendable video into an ordinary attachment.
MP4 to MP3 guides
Step-by-step walkthroughs for the things people most often need to do.
Frequently asked questions
How do I convert MP4 to MP3?
Add your MP4 file, pick an audio quality and click Convert to MP3. The audio is extracted in your browser and saved as an MP3.
Does my MP4 get uploaded?
No. The conversion happens locally in your browser, so your MP4 never leaves your device.
Will I lose audio quality?
The MP3 is encoded from the original audio track. Choosing a higher bitrate keeps it closer to the source; 192 kbps is a good balance for most people.
Can I convert other video formats too?
Yes. For MOV, MKV, WEBM, AVI and more, use the Video to MP3 tool, which accepts a wide range of video formats.