Convert M4A to AAC

Convert M4A files to AAC 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)

Upload Files

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How to convert M4A to AAC

Drop your .m4a files above, or click Upload Files. You can add many files at once.
AAC 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 .aac files as soon as each one finishes.

What to know about M4A to AAC conversion

AAC is lossy, so files become much smaller than the M4A source. 192 kbps or higher is transparent for most listeners.
You can choose the bitrate, sample rate and channels (mono, stereo or a 3D spatial effect).

M4A vs AAC

Feature	M4A (MPEG-4 Audio)	AAC (Advanced Audio Coding)
Compression	lossy or lossless	lossy
Best for	iTunes, iPhone ringtones and podcasts	good quality at low bitrates for streaming
Opens in	Apple devices, browsers and most media players	Apple devices, browsers and most media players

M4A (MPEG-4 Audio): An audio-only file extension for MPEG-4 files, commonly encoded with AAC or ALAC codecs for high quality.

AAC (Advanced Audio Coding): A lossy digital audio compression format designed as the successor to MP3, offering higher sound quality at similar bitrates.

Conversion options

Bitrate from 96 to 320 kbps
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 M4A to AAC 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 M4A 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 AAC to M4A.

Convert M4A to other formats

Convert other formats to AAC

See every M4A converter and AAC converter, or browse the full converter directory.