M4A to MP3 converter

Convert M4A (AAC) audio to MP3 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

  • M4A is AAC audio in an MPEG-4 file, widely used on Apple devices and in many recording apps. Some players and upload forms accept MP3 only.
  • Converting AAC to MP3 re-encodes the audio. To limit the loss of quality, please choose a bitrate no lower than that of the original file.
  • If a file already uses the target codec (for example, AAC audio to M4A), the original audio is copied without re-encoding.
  • For M4R, 30 seconds are taken from the start time you enter. According to Apple, a ringtone can be up to 30 seconds long.
  • WAV is uncompressed and about 7 times the size of a 192 kbps MP3.
  • 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

Which bitrate should I choose?
Original files are usually 128 to 256 kbps. 192 kbps is suitable for most purposes; please choose 320 kbps for the highest quality.
Can I convert several files at once?
Yes, up to 20 files at a time. When all are done, they can be downloaded together as one ZIP file.
Can I extract the audio from a video?
Yes. Upload the video file, and only its audio is saved.

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)