Convert OPUS to M4A
Drop a .opus file and download an .m4a carrying AAC audio at 192 kbps. Sample rate and channel count are preserved.
The usual case is a voice message or recorded call that needs to live in an Apple media library, get attached in an app that rejects .opus, or sit alongside other M4A files in a project.
Match the bitrate to the source
Opus voice recordings sit far below 192 kbps. Encoding them at that rate produces a file several times larger than the original with no gain, because the source sets the ceiling. Lowering the bitrate in the full Audio Converter is the better move for speech.
Music captured at a higher Opus bitrate is where 192 kbps AAC earns its place.
Two lossy passes
Opus decodes to PCM, then AAC re-encodes it. The M4A cannot be better than the .opus, only more compatible.