MP3, WAV, FLAC, M4A, M4B, MP4, AAC, OGA or WEBA, one or many. Drop them here or paste with ⌘V / Ctrl+V. Choose what each becomes on its row.
Runs on your device. Files are read and converted in your browser and aren't uploaded.
Raw AAC audio with no container around it — the bare stream that call and screen recorders, radio streams and some apps save. The sound is the same as an M4A's, but fewer players and editors handle it well.
AAC Converter — convert AAC files to any format
The audio format almost everything plays. MP3 makes small files by leaving out detail most ears won't miss, which makes it the safe choice for music, podcasts and voice notes you want to share, upload or keep on a phone.
MP3 Converter — convert MP3 files to any format
You've got a raw .aac file — from a screen or call recorder, a radio stream, a camera or an app's export — and the player you want to use doesn't open it.
A 4-minute AAC at 128 kbps is about 3.7 MB; as an MP3 at 192 kbps it's about 5.5 MB. MP3 needs a little more bitrate than AAC for the same sound, so the MP3 is bigger.
Go a step above the AAC's bitrate: 192 kbps (the default) for a 128 kbps AAC, 256 kbps for anything higher.
Anywhere — unlike raw AAC, which many players and editors handle badly.