MP4 to MP3 converter

Convert the audio in MP4 videos to MP3 files at 128, 192 or 320 kbps. You can convert up to 20 files at a time, and all files are converted in your browser.

Choose the output format

MP3192 kbps

Sound quality (bitrate)

192 kbps is suitable for most purposes. A 320 kbps file is about 70% larger.

Upload files

or drag and drop files here

Reads MP3, M4A, WAV, FLAC, OGG and other audio, as well as MP4, MOV, WebM and other videos. Not more than 4 GB per file, up to 20 files at a time.

Check and download

After you upload files, the results can be checked and downloaded here.

How to use

  1. In step 1, choose the output format and settings.
  2. In step 2, upload the files. Several can be chosen at once, and processing starts after upload.
  3. When all files are done, download them one by one or together.

Notes

  • MP4 is a video file. Music players, car stereos and phone ringtones usually require an audio file, and MP3 plays on nearly every device.
  • The audio in an MP4 is usually AAC. To keep the original quality without re-encoding, please choose M4A.
  • MP3 plays on nearly every phone, computer and car stereo. At the same bitrate, M4A (AAC) gives better sound quality and is widely used on Apple devices.
  • If the video's audio is already AAC, M4A copies the original audio without re-encoding. This is the fastest option and the quality is unchanged.
  • WAV is uncompressed and about 7 times the size of a 192 kbps MP3. Please choose it only when WAV is specifically required.
  • Processing time depends on your device and the length of the file, and progress is shown on the page. Processing takes longer on a phone, so please keep this page in the foreground and do not lock the screen.

Questions and answers

What is the difference between MP4 and MP3?
MP4 is a container that can hold both video and audio, while MP3 holds audio only. After conversion only the audio is kept, so the file is much smaller.
Does converting to MP3 reduce the sound quality?
MP3 is a lossy format, so the audio is re-encoded. 192 kbps is suitable for most purposes; please choose 320 kbps for the highest quality. To avoid re-encoding, please choose M4A.
What happens if a video has no audio?
That file is marked “Not processed” with the reason, and the remaining files are converted as usual.

Sources

Checked: October 2026

Software and licences

The following software is downloaded with this page and runs in your browser. The LGPL components are distributed unmodified as WebAssembly; their source code is available at each link.

  • Mediabunny (MPL-2.0): Reads and writes MP4, MOV, WebM, MP3, WAV and other files
  • LAME 3.100 (LGPL-2.0-or-later): Encodes MP3 (through @mediabunny/mp3-encoder)
  • FFmpeg AAC encoder (LGPL-2.1-or-later): Encodes AAC audio for M4A, M4R and MP4 when the browser cannot (through @mediabunny/aac-encoder)