Convert M4A or WAV to MP3 or Opus
Turn an M4A or WAV recording into a smaller MP3 or Opus file, for example to share a voice memo or interview.
- Runs in your browser
- No upload
- Check before download
Files and content stay on this device. Aggregate action counts are sent only with your separate consent. MP3/Opus re-encoding loses original tags and may increase size. WAV is PCM. 32 MB/file, 120 seconds total, mono/stereo; 5 files for ordered concatenation. Speed changes pitch.
Convert M4A or WAV to MP3 or Opus
- Prepare the input
Choose one supported M4A or WAV recording, then MP3 or Opus and a bitrate. Read the input profile first: mono or stereo audio, at most 32 MiB per file and 120 seconds. A familiar file extension alone doesn't mean the decoder supports the file.
- Try the worked example
For a 10-second voice recording, converting to MP3 changes the codec, not the time range you selected. Play the beginning and end of the output and compare its measured duration. Lossy encoding adds padding, so the duration can differ slightly from the decoded source.
- Check and save
Download the verified file and check its actual size and sound before you share it. A lower bitrate is an attempt to make the file smaller, not a guarantee. The original tags are not kept, so keep the original file separately.
Questions
Why is the converted file larger?
Container overhead, the bitrate, and a source that is already compact can outweigh any savings. Compare the actual size of the output instead of going by the file extension, or choose a lower supported bitrate and listen again.
Can every M4A file be converted?
No. M4A is a container, and protected, damaged or unsupported audio is refused. Browser and native codec support also matter. Don't rename an unsupported file to WAV, and don't expect a partial download.
Will the result preserve my source metadata?
MP3 and Opus outputs are re-encoded, so the tags from the original are not kept. Keep the original recording separately if you need its metadata or want to export it differently later. The audio is processed locally.