What is a .M4A file?
M4A is an MP4-based audio file, usually holding AAC (or ALAC lossless) audio - used by Apple Music and iTunes.
- Did you know
- M4A became widespread through Apple’s iTunes Store, which launched in 2003.
- Apple coined the “.m4a” extension so audio-only MPEG-4 files would not be confused with “.mp4” video.
- An M4A is structurally an MPEG-4 file, so renaming it to “.mp4” usually still plays fine.
- The same extension serves two very different codecs: lossy AAC and Apple’s lossless ALAC.
- Apple created a small family of suffixes, including .m4v for video, .m4b for audiobooks and .m4r for ringtones.
- What Analyser shows you
- Inspect the waveform, spectrogram, codec, bitrate, channels, and tags of MP3, WAV, FLAC, M4A, AAC, OGG, and Opus audio.
- Open a .M4A file
- Drag a .M4A file onto the Analyser home page (or tap to pick one). It opens entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.