Convert AAC to M4A
Convert AAC files to M4A locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
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How to convert AAC to M4A
- Drop your .aac files above, or click Upload Files. You can add many files at once.
- M4A is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. FFmpeg runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .m4a files as soon as each one finishes.
What to know about AAC to M4A conversion
- Converting a lossy AAC to M4A cannot restore detail that was already discarded, but it avoids any further loss in later edits.
- You can choose the bitrate, sample rate and channels (mono, stereo or a 3D spatial effect).
AAC vs M4A
| Feature | AAC (Advanced Audio Coding) | M4A (MPEG-4 Audio) |
|---|---|---|
| Compression | lossy | lossy or lossless |
| Best for | good quality at low bitrates for streaming | iTunes, iPhone ringtones and podcasts |
| Opens in | Apple devices, browsers and most media players | Apple devices, browsers and most media players |
AAC (Advanced Audio Coding): A lossy digital audio compression format designed as the successor to MP3, offering higher sound quality at similar bitrates.
M4A (MPEG-4 Audio): An audio-only file extension for MPEG-4 files, commonly encoded with AAC or ALAC codecs for high quality.
Conversion options
- Bitrate from 96 to 320 kbps
- Apple Lossless (ALAC) mode
- Sample rate: 22.05, 44.1 or 48 kHz
- Mono, stereo or 3D spatial audio
- Playback speed (0.5× to 2×)
Frequently asked questions
Is it safe to convert AAC to M4A here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several AAC files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert M4A to AAC.
Convert AAC to other formats
Convert other formats to M4A
- MP4 to M4A
- MP3 to M4A
- WAV to M4A
- MOV to M4A
- FLAC to M4A
- WEBM to M4A
- MKV to M4A
- OGG to M4A
- OPUS to M4A
- AVI to M4A
- WMA to M4A
- AIFF to M4A
See every AAC converter and M4A converter, or browse the full converter directory.