Convert AAC to text

Yes! Sonix fully supports AAC transcription. AAC's efficient encoding preserves speech clarity even at lower bitrates, making it excellent for transcription. Whether your AAC files come from iTunes, streaming services, or recording apps, Sonix handles them all.

AAC provides better audio quality than MP3 at equivalent bitrates, which can marginally improve transcription accuracy for challenging audio. At common bitrates (128-256kbps), both formats transcribe excellently for clear speech content.

Sonix transcribes AAC files at approximately 10x real-time speed. A 30-minute AAC recording transcribes in about 3 minutes. AAC's efficient compression means smaller file sizes and faster uploads compared to uncompressed formats.

If you have downloaded AAC files from streaming services (legally, for personal use), Sonix can transcribe them. Note that DRM-protected content cannot be processed. Most podcast downloads and purchased music use unprotected AAC.

AAC at 96kbps or higher works well for speech transcription. The codec's advanced features handle voice frequencies efficiently. For best results with music or complex audio, 128kbps+ is recommended. Most commercial content uses 256kbps which is excellent.

Absolutely! Sonix's speaker diarization works well with AAC audio, identifying and labeling different speakers automatically. The format's quality preservation helps our AI distinguish between voices accurately.

Both typically contain the same AAC-encoded audio; the difference is packaging. A .aac file is a raw ADTS stream, while a .m4a file wraps the audio in an MPEG-4 container that supports metadata such as tags, artwork, and chapters.

Raw .aac files are a bare audio stream without a standard container, so some players and editors that expect MP4/M4A files cannot read them. Renaming the extension does not fix this — remux or convert the file into an M4A or MP3 instead.