Convert Audio to AAC
Apple's Default Format, Better Quality Than MP3
Need to use Convert Audio to AAC right now?
AAC generally achieves better audio quality than MP3 at the same bitrate, especially at lower bitrates.
Drop an audio file, or click to browse
Processed locally in your browser — never uploaded
Encodes to AAC in an .m4a container — the format Apple devices and iTunes/Music use by default, generally more efficient than MP3 at the same bitrate.
Features
- Runs entirely in your browser
- Privacy-first — your data is never uploaded
- Real-time, instant results
- 100% free, no sign-up required
- Works on desktop, tablet, and mobile
- No installation needed
Who uses this tool?
People also search for
About Convert Audio to AAC
AAC is the format Apple devices, iTunes, and Apple Music use by default, and it generally achieves better audio quality than MP3 at the same bitrate thanks to a more modern encoding design. This tool converts any audio your browser's FFmpeg build can decode into AAC, packaged in the standard .m4a container Apple software expects.
A real FFmpeg build compiled to WebAssembly performs the encoding entirely inside your browser using FFmpeg's native AAC encoder at 192kbps, a bitrate that comfortably preserves strong audio quality for both spoken word and music content.
The output uses the .m4a file extension rather than raw .aac, since .m4a is the standard container Apple's own software and most modern players expect when working with AAC audio — this ensures the file behaves correctly when imported into iTunes/Music or transferred to an Apple device.
AAC's efficiency advantage over MP3 is most noticeable at lower bitrates; at higher bitrates like the 192kbps used here, both formats sound very close to transparent for most listeners, so the main practical reason to choose AAC specifically is compatibility with Apple's ecosystem and software.
How it works
- Upload your audio file. Any format your browser's FFmpeg build can decode.
- Conversion runs locally. Audio is encoded as AAC at 192kbps.
- Download the .m4a file. Ready for iTunes, Apple Music, or any AAC-compatible player.
Examples
Preparing audio for an Apple device
Input
audio file needed in Apple's default format
Output
an .m4a (AAC) file ready to import