M4A Compressor
Pick a quality, keep what matters. Free, fast, no signup.
One file at a time for now
Batch processing isn't available yet: drop files one by one, or use the Merger to join them.
- Free, no signup
- No watermark, ever
- Files auto-delete in 1 hour
- Nothing to install
M4A is AAC in Apple's favorite outfit: the audio-only MP4 your iPhone speaks natively. An MP4 container holding only audio: usually AAC, occasionally Apple's lossless ALAC.
- Born
- 2003, popularized by Apple's iTunes Store
- Type
- audio · lossy
- Typical size
- like AAC: better-than-MP3 sound at about 1 MB per minute
- Plays on
- iPhone, Mac and iTunes natively; most modern Android and Windows apps too.
- Fun fact
- Apple invented the .m4a extension purely so audio files wouldn't be mistaken for .mp4 video.
What compressing M4A actually does
M4A is already lossy-compressed, so compressing it further means re-encoding at a lower bitrate. Realistic savings run 30–70%, depending on how generous the original bitrate was: M4A typically runs like AAC: better-than-MP3 sound at about 1 MB per minute. Squeeze too hard and you will hear it; Flippy's presets stay on the polite side of that line.
Questions people ask
How much smaller will my M4A get?
It depends on how generously it was encoded: M4A typically runs like AAC: better-than-MP3 sound at about 1 MB per minute, and most files give up 30–70% at the medium preset before quality visibly suffers.
Will I lose quality working with M4A here?
M4A is a lossy format, so re-encoding trims a little detail each time. Work from the best source you have and convert once: at sensible bitrates the difference stays inaudible.
Is this M4A compressor really free?
Yes: free for everyday use with no daily cap, no signup, and your files delete themselves from our servers within an hour. Pro exists for heavy days: bigger files, whole folders at once.