Choose your WebM file
Select WebM from your device. The file is processed locally.
ON YOUR DEVICE
WebM to M4A
Convert WebM audio to M4A 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 M4A output
M4A output contains AAC audio in an MPEG-4 container. It does not create Apple Lossless audio.
Save and check your M4A 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 WebM to M4A?
WebM audio output uses Opus. This page converts the audio track and does not preserve video. M4A output contains AAC audio in an MPEG-4 container. It does not create Apple Lossless audio. Converting a lossy recording cannot recover lost audio detail. Tags, artwork, chapters and DRM protection are not preserved or bypassed.
Will the M4A file be smaller?
Not necessarily. M4A output contains AAC audio in an MPEG-4 container. It does not create Apple Lossless audio. Size depends on the source and settings. The result reports file sizes and processing time.
Which WebM 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 WebM to M4A?
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.