MP3 to AAC Offline Converter
Convert MP3 audio files to AAC format completely offline in your browser
No Upload
100% Private
Free
You might also need:
Loading Processing Engine
This tool uses FFmpeg.wasm. The first run downloads the engine (~25MB) — cached after.
Initializing processor...
Drop your MP3 files here
or click to select
Processing: -
Working...0 / 0
Initializing...
Output Files
Why Use This Tool
Apple-Friendly
AAC is the native audio format for iTunes, Apple Music, and iOS.
Better Quality / Bit
AAC produces better audio quality than MP3 at the same bitrate.
100% Private
Your audio stays on your device.
Frequently Asked Questions
Will I lose quality re-encoding from MP3?
A small amount of generation loss is unavoidable when transcoding between lossy formats. The result is acceptable for casual listening but not for archival.
Are my files uploaded anywhere?
No. Processing is entirely client-side via FFmpeg.wasm — files never leave your browser.
How big can my files be?
Limited by your device's RAM. ~2GB on desktop, smaller on mobile. Browser memory is the constraint.