M4A vs OPUS
A quick, plain-English comparison of the M4A and OPUS file formats — and how to convert between them, free and in your browser.
| M4A | OPUS | |
|---|---|---|
| Category | audio | audio |
| Extension | .m4a | .opus |
| MIME type | audio/mp4 | audio/opus |
| Converts to | 17 formats | 17 formats |
| Direction here | read & write | read & write |
Convert between M4A and OPUS
M4A vs OPUS: frequently asked questions
What's the difference between M4A and OPUS?
MPEG-4 audio container (AAC/ALAC). Modern low-latency lossy audio codec.
Should I use M4A or OPUS?
Both are audio formats — the right one depends on compatibility, quality and file size for your use. Whichever you have, you can convert it to the other below in seconds.
How do I convert M4A to OPUS?
Open the M4A-to-OPUS converter, drop your M4A file in, and download the OPUS. We auto-detect the real format from the file's bytes, so a mislabeled file still works.