How to convert MP4 to MP3
- 1
Upload your file
Drag and drop a file or click to select one. Keep this page open while the file uploads and converts.
- 2
Convert MP4 to MP3
NexMedia converts MP4 to MP3 on its own servers. Processing time depends on the file size and how busy the queue is.
- 3
Download the converted file
When the conversion finishes, the download appears on this page. Your converted file is kept for 2 hours, then deleted.
About MP4
MP4 (MPEG-4 Part 14) is a container format standardised by ISO. It usually holds H.264 or H.265 video with AAC audio, and it can also carry subtitles and chapter markers.
It is the most widely supported video format: phones, browsers, smart TVs and video sites all play it.
The video inside an MP4 is almost always compressed with a lossy codec, so every re-encode loses a little quality.
Convert MP4 to MP3 online free, no account required — MP3 is a universally supported lossy audio format.
Change MP4 to MP3 without losing quality — convert MP4 to MP3 free in your browser.
Why is my MP4 file so large? MP4 video is already compressed with H.264 or H.265, so a lower bitrate or resolution shrinks the file at the cost of some quality.
About MP3
MP3 (MPEG-1 Audio Layer III) is a lossy audio format from the early 1990s. It removes the sound listeners are least likely to notice, typically at 128 to 320 kbit/s.
It plays on virtually every device and app, which makes it the default for music files, podcasts and audiobooks.
MP3 tops out at 320 kbit/s and two channels, and every re-encode removes a little more detail.
Why convert music to MP3? Every device, car stereo and app made in the last 25 years plays it, so nothing and nobody is left out.
What changes when you convert MP4 to MP3
- The soundtrack of the MP4 is re-encoded as MP3 at the default settings, so it is close to the original but not bit-identical.
- Only the sound is kept: the MP3 file contains the audio track of your MP4, and the picture is dropped.
Settings you can change
Before you convert MP4 to MP3, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Limits
Each plan sets a maximum file size and a number of conversions per day, and video and audio files also have a maximum length. Guests can convert files up to 100 megabytes and 5 per day; a free account raises this to 500 megabytes and 25 per day; paid plans go up to 100 gigabytes.
Your converted MP3 file is kept for 2 hours, then deleted.
MP4 to MP3: questions and answers
Does converting MP4 to MP3 reduce quality?
The soundtrack of the MP4 is re-encoded as MP3 at the default settings, so it is close to the original but not bit-identical.
What is the difference between MP4 and MP3?
MP4 is a widely supported video container, usually holding H.264 video and AAC audio. MP3 is a universally supported lossy audio format.
Can I change the settings when converting MP4 to MP3?
Before you convert MP4 to MP3, you can adjust: Audio codec, Rate control, Audio bitrate, Quality (VBR), Sample rate, Channels, Normalize loudness, Trim start, Trim duration, and Keep tags.
Do I need an account to convert MP4 to MP3?
No. You can convert MP4 to MP3 without an account; signing in raises the file-size and daily limits.
How long is my converted MP3 file kept?
The MP3 file you convert from MP4 is kept for 2 hours, then deleted automatically.
When I convert MP4 to MP3, can I keep just the sound?
Only the sound is kept: the MP3 file contains the audio track of your MP4, and the picture is dropped.
Will converting MP4 to MP3 change my original file?
No. The conversion reads your MP4 and writes a new MP3 file, leaving your original MP4 file untouched.