media → media
Convert MP4 to MP3
Convert MP4 to MP3 in seconds. Free, no signup, no watermark, no file-size limit. Runs on our conversion servers.
At a glance
- Source
- MP4
- Target
- MP3
- Where it runs
- Our servers
- Cost
- Free, unlimited
- Account
- Not needed
MP4 to MP3 is on the release list
The video track is discarded and the audio track is re-encoded into a standalone audio file. That needs a full document rendering engine, so it will run on our servers rather than in your browser. It is next in the queue and it will be free.
Do it now, on your device
These MP4 conversions work right now
Same source file, no upload, no account, no watermark. Pick one and the converter opens with sensible defaults already set.
The details
What happens when you extract audio from video
The standard video container. It plays on every phone, browser and television made in the last decade. The video track is discarded and the audio track is re-encoded into a standalone audio file. The result is a the digital audio format that made music portable, produced on our conversion servers.
What survives
- The audio, at the quality the new codec allows
- The full duration
What changes
- The picture, obviously
- The quality, if the audio is re-encoded rather than copied
Where it goes wrong
- Some containers keep the audio in a form that has to be converted, and that conversion is lossy
- Multi-track audio keeps only the first track unless you ask for another
Why anyone would do this
The lecture without the slides, small enough to send on a slow connection.
About the format
The standard video container.
An ISO base media container with separate tracks for video and audio, plus a metadata track describing how to play them.
- Where it is good
- Plays on iOS, Android, every modern browser and most smart TVs
- Handles 4K, HDR and multiple audio tracks
- A good container for streaming, so it does not need the whole file
- Where it falls short
- Not editable — the tracks are compressed
- Long files get large quickly
- Codec support varies, so a 4K HEVC file may not play in a browser
- You will find it on
- Phone cameras, YouTube, WhatsApp, every streaming service
The thing people miss
MP4 is a container, not a codec — the file inside might be H.264 or HEVC, which is why the same MP4 plays on one device and not another.
About the target
The digital audio format that made music portable.
A stream of MPEG-1 Audio Layer III frames, each holding a slice of the audio plus a little compressed data about how to reconstruct the rest.
- Plays literally everywhere
- Small enough to send over a slow connection
- Metadata (title, artist, album art) travels inside the file
Real jobs
What people are actually doing with MP4
A video a client has to be able to open
Extracting the audio track as a separate file
Taking still frames out of a recording
Specification
The details, in one table
| Source format | MP4 — MP4 video |
|---|---|
| Target format | MP3 — MP3 audio |
| Typical source size | 50 MB – 4 GB |
| Runs | On our servers |
| Account needed | No |
| Watermark | None |
| File extension | .mp4 → .mp3 |
How to
MP4 to MP3, step by step
- 01
Add your mp4 video
Drag the file onto the drop zone, or tap to browse. Only one file is needed.
- 02
Choose the MP3 settings
Set the MP3-specific options.
- 03
Download the result
The finished MP3 downloads to your device. Nothing is uploaded and nothing is retained.
Also available
MP4 converts into
Queued for the servers
Questions
MP4 conversion questions
What actually happens to my MP4 file when I convert it to MP3?
The video track is discarded and the audio track is re-encoded into a standalone audio file. So the MP4 file is unpacked, the content is laid out, and the result is written out as MP3. The audio, at the quality the new codec allows survives unchanged.
Will converting MP4 to MP3 reduce the quality?
Partly. The quality, if the audio is re-encoded rather than copied The text itself is never re-typed, so no words are lost.
Is my MP4 file uploaded to a server?
This particular conversion needs a full document rendering engine, so it is processed on our servers. Your MP4 file is deleted automatically within an hour of the download being ready, and it is never opened or reviewed by a person.
Do I need an account or will there be a watermark?
Neither. There is no sign-up step, no email capture and no watermark on the output. The only limits are the ones your own device imposes.
What is the most common mistake people make when converting MP4 to MP3?
Some containers keep the audio in a form that has to be converted, and that conversion is lossy
Why would somebody convert MP4 to MP3 at all?
The lecture without the slides, small enough to send on a slow connection. In short: a video a client has to be able to open
Something most people do not know about MP4?
MP4 is a container, not a codec — the file inside might be H.264 or HEVC, which is why the same MP4 plays on one device and not another.