Convert to AAC
Get Apple-optimized AAC audio from any source format.
MP3 to AAC
MP3→ AAC
Re-encode MP3 to AAC for better streaming and Apple device compatibility.
WAV to AAC
WAV→ AAC
Compress lossless WAV recordings to AAC for sharing and streaming.
FLAC to AAC
FLAC→ AAC
Convert lossless FLAC archives to high-quality AAC for Apple Music.
OGG to AAC
OGG→ AAC
Convert open-source OGG Vorbis to widely compatible AAC audio.
WMA to AAC
WMA→ AAC
Modernize old Windows Media Audio files to AAC for universal playback.
AIFF to AAC
AIFF→ AAC
Convert Apple AIFF masters to AAC for iTunes and Apple Music upload.
M4A to AAC
M4A→ AAC
Re-encode M4A audio to a straight AAC file without the container.
Opus to AAC
Opus→ AAC
Convert web-optimized Opus audio to AAC for broader device support.
Convert from AAC
Convert AAC audio to MP3, WAV, FLAC, OGG, or M4A for broader compatibility.
AAC to MP3
AAC → MP3
Convert AAC to the universally compatible MP3 format.
AAC to WAV
AAC → WAV
Decode AAC to uncompressed WAV for professional audio editing.
AAC to M4A
AAC → M4A
Wrap AAC audio in the M4A container for Apple device compatibility.
AAC to OGG
AAC → OGG
Convert AAC to open-source OGG Vorbis for Linux and game engines.
AAC to FLAC
AAC → FLAC
Convert AAC to a lossless FLAC container for archiving.
About the AAC Format
AAC (Advanced Audio Coding) was standardized in 1997 as part of the MPEG-4 specification, designed to replace MP3 as the dominant lossy audio format. Apple adopted it as the default for iTunes and the iPod in 2003, which cemented its status as the most widely deployed audio codec after MP3.
The key advantage of AAC over MP3 is efficiency. At 128 kbps, AAC sounds significantly better than MP3 at the same bitrate. This makes AAC the right choice for streaming, mobile storage, and any situation where file size matters. Apple Music streams at 256 kbps AAC -- a setting that is transparent to virtually all listeners.
AAC is widely supported: iPhones, iPads, Macs, Android (4.1+), YouTube, Spotify, Apple Music, and most modern streaming platforms all handle AAC natively. The main caveat is that AAC is still patent-licensed, unlike the open-source OGG Vorbis or Opus codecs.
Convert AAC files without uploading them
AudioUtils runs FFmpeg as WebAssembly directly in your browser. Your AAC files -- whether they are music recordings, voice memos, podcast drafts, or unreleased tracks -- never leave your device. No servers receive your audio. No temporary files are stored remotely. No privacy policy loophole allows us to access your content, because we never receive it. Conversion speed is limited only by your CPU, not by upload bandwidth.
Frequently Asked Questions
Is this AAC converter free?
Yes. AudioUtils is free to use. The free tier outputs a 10-second preview of your converted file. Pro ($9/mo) removes the preview limit so you can convert full-length files up to 500 MB.
What formats can I convert to AAC?
You can convert MP3, WAV, FLAC, M4A, OGG, WMA, AIFF, and Opus to AAC. All conversions run entirely in your browser using FFmpeg WebAssembly -- nothing is uploaded to any server.
What is AAC and how does it differ from MP3?
AAC (Advanced Audio Coding) was designed as the successor to MP3. At the same bitrate, AAC typically sounds noticeably better than MP3 -- especially at lower bitrates like 128 kbps. AAC is the default format for iTunes, Apple Music, YouTube streaming, and most Apple devices. It is stored as .aac or .m4a files.
Is AAC the same as M4A?
AAC is the audio codec; M4A is the container format. An M4A file almost always contains AAC audio. The difference is like MP3 (codec) vs a plain .mp3 file. For most purposes, AAC and M4A are interchangeable. AudioUtils can convert to both.
What bitrate should I use for AAC?
For music: 256 kbps AAC is the Apple Music and iTunes standard -- transparent quality for most listeners. 128 kbps AAC sounds better than 128 kbps MP3 and is fine for podcasts and speech. For the best balance of quality and file size, use 192 kbps for music and 96-128 kbps for voice.