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