Choose your M4A file
Select M4A from your device. The file is processed locally.
ON YOUR DEVICE
M4A to Opus
Convert M4A audio to Opus on your device. Choose settings and download the result.
Drop your file here
One file · Device-dependent capacity · Best for short clips
Files stay on your device
Three simple steps
Prepare Opus output
Opus output uses an Ogg container. It is suitable for speech and music but player support varies.
Save and check your Opus file
Converting a lossy recording cannot recover lost audio detail. Tags, artwork, chapters and DRM protection are not preserved or bypassed.
Common questions
What changes when I convert M4A to Opus?
M4A output contains AAC audio in an MPEG-4 container. It does not create Apple Lossless audio. Opus output uses an Ogg container. It is suitable for speech and music but player support varies. Converting a lossy recording cannot recover lost audio detail. Tags, artwork, chapters and DRM protection are not preserved or bypassed.
Will the Opus file be smaller?
Not necessarily. Opus output uses an Ogg container. It is suitable for speech and music but player support varies. Size depends on the source and settings. The result reports file sizes and processing time.
Which M4A files work here?
The container must contain decodable media. Encrypted or DRM-protected streams are unsupported. Test a short sample if your recording uses an unusual codec.
Is there a size cap for M4A to Opus?
There is no fixed file-size quota. Process one main file at a time. Your device memory and browser determine practical capacity. Large selections show a warning that you can continue past.