Convert MP3 to AAC

AAC is the format streaming services and Apple settled on, and it holds up better than MP3 at low bitrates. Going MP3 to AAC means compressing twice, so keep the bitrate up if the source is already modest.

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What is MP3?

The format that made digital music portable, and thirty years on it's still the safest bet that a file will simply play - any device, any car, any decade-old bit of hardware. It's lossy, its patents expired in 2017, and no browser has ever been able to write one, which is why encoding it here needs LAME.

What is AAC?

MP3's designated successor and the audio in most video - YouTube, streaming services, broadcast, virtually every MP4. At a given bitrate it beats MP3 audibly, especially below 128kbps, and every phone and browser decodes it.

Your files never leave your device · no magic required