Convert M4A to AAC Online Free
Convert your .m4a files to .aac format. Free, fast, and processed entirely in your browser — your files never leave your device.
What is M4A?
MPEG-4 Audio (.m4a) — M4A is an audio-only MPEG-4 container, typically containing AAC-encoded audio. It is Apple's preferred audio format and supports both lossy and lossless compression (Apple Lossless).
What is AAC?
Advanced Audio Coding (.aac) — AAC is the successor to MP3, offering better sound quality at similar bitrates. It is the default audio format for Apple devices, YouTube, and many streaming services.
M4A vs AAC
| Feature | M4A | AAC |
|---|---|---|
| Full Name | MPEG-4 Audio | Advanced Audio Coding |
| Compression | Lossy | Lossy |
| Typical Bitrate | 128-256 kbps | 128-256 kbps |
| Best For | Apple Music, iTunes, iPhone/iPad audio | Apple devices, streaming services, mobile audio |
| File Extension | .m4a | .aac |
Frequently Asked Questions
Is converting M4A to AAC free?
Yes, completely free. The conversion runs entirely in your browser using WebAssembly — your files never leave your device and no sign-up is required.
Will I lose audio quality converting M4A to AAC?
Both M4A and AAC use lossy compression. There may be a slight quality loss from re-encoding. If possible, convert from the original lossless source.
What is the maximum file size?
You can convert audio files up to 100MB. Since the conversion happens in your browser, processing speed depends on your device's performance.
Is my audio file uploaded to a server?
No. All format conversion is processed locally in your browser using FFmpeg WebAssembly. Your files never leave your device, ensuring complete privacy.