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AAC to M4A - Online Audio Converter
Convert AAC to M4A online. Private, client-side - no uploadrequired. Batch conversion, quality presets, codec control.
Convert AAC to M4A
Drop AAC audio here or click to select
AAC
M4A (AAC)
About AAC to M4A
Convert AAC to M4A. AAC is the MPEG-4 successor to MP3 used by YouTube and Apple Music. M4A is the MPEG-4 audio container usually holding AAC or ALAC. Check whether the track is AAC or ALAC before picking settings..
Why convert AAC to M4A?
- Smaller files with M4A lossy compression.
- Keep quality where supported.
- Private, no upload - runs in your browser.
AAC vs M4A
| Codec | AAC | AAC |
|---|---|---|
| Compression | lossy | lossy |
| Sample behavior | Quality set by bitrate | Quality set by bitrate |
| Typical use | AAC is the MPEG-4 successor to MP3 used by YouTube and Apple Music. | M4A is the MPEG-4 audio container usually holding AAC or ALAC. |
When not to convert AAC to M4A
- Skip M4A for archival masters: lossy compression discards detail, so keep the AAC original.
- Keep a master copy: repeated exports stack small losses, so archive AAC before batch M4A shares.
Limits
Starting point: AAC - Efficient lossy audio for streaming services. Container variants (ADTS, MP4) need matching extensions on export. Check whether the track is AAC or ALAC before picking settings. Encode M4A (AAC) from AAC at 256k for music or 128k for speech, starting from the master.
How conversion works
Conversion runs entirely in your browser with FFmpeg WASM. Files never leave your device.
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FAQ
How do I convert AAC to M4A?
Drop your AAC file onto this page, choose quality and codec settings, then click Convert. The result downloads as M4A instantly. All processing runs in your browser.
What codec is used for M4A?
The default codec for M4A is AAC. You can change audio parameters in Advanced mode.
How do you store my files?
We do not store any processed audio. All conversion happens entirely in your browser using FFmpeg WASM.