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MP4 to MP3 Converter

Convert your MP4 files to MP3 format. Private — converted on your device.

Processed on your device — files never leave your machine

Drop your MP4 file here or click to browse

Converted on your device — files never uploaded

How to Convert MP4 to MP3

  1. 1 Upload your MP4 file
  2. 2 Converted on your device — files never uploaded
  3. 3 Download your MP3 file

MP4 to MP3: keep the sound, drop the picture

An MP4 is a video file: a picture track and, in most cases, an AAC sound track in one container. Converting it to MP3 keeps only the sound, which is what you want from a recorded talk, a live set, a rehearsal or a music video you mean to play on a phone, in a car or from a music library.

The sound track is decoded on your device and encoded as a constant-bitrate MP3 at 128, 192, 256 or 320 kbps, or as V0, the top variable-bitrate setting; 320 kbps is selected unless you change it. Without the picture the file shrinks to the size of its audio: about 2.4 MB per minute at 320 kbps, under 1 MB per minute at 128 kbps. The MP3 comes out at 44.1 or 48 kHz, and a 5.1 sound track is folded to stereo, which the result line states.

Limits: 30 minutes of audio, and the video file together with its decoded sound must fit your device's memory, which is smaller on a phone or tablet. A long or high-resolution video can reach the memory limit well before 30 minutes, so trim it first. The MP3 carries no title, artist or cover art.

Frequently Asked Questions

Is MP4 or MP3 better quality?
Both MP4 and MP3 are lossy formats. MP3 has the widest device compatibility. Quality depends on the bitrate — 320 kbps is near-transparent for most listeners.
Will I lose quality converting MP4 to MP3?
Each lossy re-encoding loses a small amount of quality. For one conversion at 320 kbps, the loss is negligible. Avoid converting back and forth between lossy formats repeatedly.
How long does conversion take?
Seconds for most files. Conversion runs entirely on your device — no upload wait, no server queue. Files up to 30 minutes long are supported.
Does the MP3 keep anything from the video?
Only the sound. The picture track is never decoded or written, so the MP3 is the size of the audio at the bitrate you choose.
Why was my MP4 refused?
Checks run before encoding: the decoded audio must be 30 minutes or shorter, and the file plus that audio must fit your device's memory budget, a lower one on a phone or tablet. Trim the video, or export a shorter clip, and try again.
My MP4 has 5.1 sound. What does the MP3 get?
A stereo mix. MP3 carries at most two channels, so the six channels are folded with the standard speaker downmix: centre and surrounds go into left and right, and the LFE channel is left out.
Brizm

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