Is AAC better quality than MP3?

Yes. AAC uses a more efficient compression algorithm than MP3. A 128kbps AAC file sounds similar to a 192kbps MP3 file.

Is AAC supported everywhere MP3 is?

AAC is supported on all Apple devices, Android, modern browsers, and most streaming platforms. Some older hardware and software may only support MP3.

Are my files uploaded to a server?

No. All conversion runs in your browser using WebAssembly. Your MP3 files never leave your device.

Yes, completely free with no account needed.

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Conversion

MP3 to AAC Converter Online Free

Convert MP3 audio files to AAC format in your browser. AAC (Advanced Audio Coding) is the standard codec for Apple devices, iOS, iTunes, and streaming services including YouTube. It delivers better audio quality than MP3 at the same file size. Runs using FFmpeg.wasm — your files stay on your device.