How to convert OPUS to AAC
- Add your .OPUS file - drop it in the box above or click to browse.
- Convert it to .AAC in a few seconds.
- Download your new .AAC file.
What to expect
- OPUS and AAC are both lossy; converting between them (a lossy-to-lossy re-encode) causes a small quality reduction that is usually inaudible for voice but can introduce artefacts in music at low bitrates.
- Use 96 kbit/s or higher for voice recordings and 128-192 kbit/s for music to minimise re-encoding degradation.
- The standard output container is
.m4a(AAC inside MPEG-4), which has broader app support than a raw.aacstream.
Frequently asked questions
Does converting OPUS to AAC reduce quality?
Yes, slightly. Both formats are lossy, so re-encoding always adds a small amount of generation loss; for voice messages this is typically inaudible at 96 kbit/s or higher.
Should I save the output as `.aac` or `.m4a`?
Use
.m4a - it packages AAC audio inside an MPEG-4 container, which Apple apps, Windows, and Android all support natively; raw .aac files are less compatible.Why do Apple apps reject my OPUS file?
GarageBand, iMovie, and QuickTime do not include an Opus decoder. Converting to AAC (
.m4a) makes the file natively recognised without any extra plugins.Can I convert multiple OPUS files at once?
Yes - ffmpeg supports wildcards and shell loops for batch jobs, and GUI tools like foobar2000 accept multiple files dragged in at the same time.
Programs that convert OPUS: TAudioConverter Audio Converter
